Expected unqualified id before numeric constant ардуино ошибка

After debugging and having some conflicting declarations about analog pins, I finally thought it was done, after compiling I got this error:

32:0,
1:
31:12: error: expected unqualified-id before numeric constant


2:5: note: in expansion of macro 'B1'

I can’t understand what this means. What’s wrong with my code down here?

// don't judge me if it's too long and overcomplicated :P I'm still new xD
int AA1 = 0;
int B1 = 1;
int C1 = 2;
int D1 = 3;
int AA2 = 4;
int B2 = 5;
int C2 = 6;
int AA3 = 8;
int B3 = 9;
int C3 = 10;
int D3 = 11;
int B4 = 12;
int C4 = 13;
int sec = 0;
int min1 = 0;
int min2 = 0;
int hour1 = 8;
bool hour2 = 0;

void setup() {
  pinMode(AA1, OUTPUT);
  pinMode(B1, OUTPUT);
  pinMode(C1, OUTPUT);
  pinMode(D1, OUTPUT);
  pinMode(AA2, OUTPUT);
  pinMode(B2, OUTPUT);
  pinMode(C2, OUTPUT);
  pinMode(AA3, OUTPUT);
  pinMode(B3, OUTPUT);
  pinMode(C3, OUTPUT);
  pinMode(D3, OUTPUT);
  pinMode(B4, OUTPUT);
  pinMode(C4, OUTPUT);
}

void loop() {
  OutputOn();
  delay(1000);
  sec++;
  if(sec == 60) {
    sec = 0;
    min1++;
      if(min1 == 10) {
      min1 = 0;
      min2++;
        if(min2 == 6) {
        min2 = 0;
        hour1++;
          if(hour1 == 10) {
          hour1 = 0;
          hour2 = 1;
        }
        if(hour2 == 1, hour1 == 3) {
          hour1 = 1;
          hour2 = 0;
        }
      }
    }
  }
}

void OutputOn() {
  digitalWrite(B1, LOW);
  digitalWrite(C1, LOW);
  digitalWrite(D1, LOW);
  digitalWrite(A2, LOW);
  digitalWrite(B2, LOW);
  digitalWrite(C2, LOW);
  digitalWrite(A3, LOW);
  digitalWrite(B3, LOW);
  digitalWrite(C3, LOW);
  digitalWrite(D3, LOW);
  digitalWrite(B4, LOW);
  digitalWrite(C4, LOW);
  if(min1 == 1) { digitalWrite(AA1, HIGH); }
  if(min1 == 2) { digitalWrite(B1, HIGH); }
  if(min1 == 3) { digitalWrite(B1, HIGH); digitalWrite(AA1, HIGH); }
  if(min1 == 4) { digitalWrite(C1, HIGH); }
  if(min1 == 5) { digitalWrite(C1, HIGH); digitalWrite(AA1, HIGH); }
  if(min1 == 6) { digitalWrite(D1, HIGH); digitalWrite(B1, HIGH); }
  if(min1 == 7) { digitalWrite(D1, HIGH); digitalWrite(AA1, HIGH); digitalWrite(B1, HIGH); }
  if(min1 == 8) { digitalWrite(D1, HIGH); }
  if(min1 == 9) { digitalWrite(D1, HIGH); digitalWrite(AA1, HIGH); }
  if(min2 == 1) { digitalWrite(AA2, HIGH); }
  if(min2 == 2) { digitalWrite(B2, HIGH); }
  if(min2 == 3) { digitalWrite(B2, HIGH); digitalWrite(AA1, HIGH); }
  if(min2 == 4) { digitalWrite(C2, HIGH); }
  if(min2 == 5) { digitalWrite(C2, HIGH); digitalWrite(A2, HIGH); }
  if(min2 == 6) { digitalWrite(C2, HIGH); digitalWrite(B2, HIGH); }
  if(hour1 == 1) { digitalWrite(AA3, HIGH); }
  if(hour1 == 2) { digitalWrite(B3, HIGH); }
  if(hour1 == 3) { digitalWrite(B3, HIGH); digitalWrite(AA3, HIGH); }
  if(hour1 == 4) { digitalWrite(C3, HIGH); }
  if(hour1 == 5) { digitalWrite(C3, HIGH); digitalWrite(AA3, HIGH); }
  if(hour1 == 6) { digitalWrite(C3, HIGH); digitalWrite(B3, HIGH); }
  if(hour1 == 7) { digitalWrite(C3, HIGH); digitalWrite(AA3, HIGH); digitalWrite(B3, HIGH); }
  if(hour1 == 8) { digitalWrite(D3, HIGH); }
  if(hour1 == 9) { digitalWrite(D3, HIGH); digitalWrite(C3, HIGH); }
  if(hour2 == 1) { digitalWrite(B4, HIGH); digitalWrite(C4, HIGH); }
}

It’s supposed to be code for a clock (if it wasn’t obvious enough) hooked up to 4 7-segment decoders, also connected to 4 7-segment LED displays.

I’m attaching my rfid MFRC522 to my Arduino when I get this error:

Arduino: 1.6.6 Hourly Build 2015/09/18 03:38 (Windows 7), Board: "Arduino/Genuino Uno"

sketch_mar11b:34: error: expected unqualified-id before numeric constant

sketch_mar11b.ino:36:10: note: in expansion of macro 'SS_PIN'

sketch_mar11b:34: error: expected ')' before numeric constant

sketch_mar11b.ino:36:10: note: in expansion of macro 'SS_PIN'

sketch_mar11b.ino: In function 'void setup()':

sketch_mar11b:41: error: expected initializer before '.' token

sketch_mar11b.ino: In function 'void loop()':

sketch_mar11b:47: error: 'mfrc522' was not declared in this scope

sketch_mar11b:52: error: 'mfrc522' was not declared in this scope

sketch_mar11b:57: error: 'mfrc522' was not declared in this scope

exit status 1
expected unqualified-id before numeric constant

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.

But this is my regular code for my stuff:

/*
 * MFRC522 - Library to use ARDUINO RFID MODULE KIT 13.56 MHZ WITH TAGS SPI W AND R BY COOQROBOT.
 * The library file MFRC522.h has a wealth of useful info. Please read it.
 * The functions are documented in MFRC522.cpp.
 *
 * Based on code Dr.Leong   ( WWW.B2CQSHOP.COM )
 * Created by Miguel Balboa (circuitito.com), Jan, 2012.
 * Rewritten by Søren Thing Andersen (access.thing.dk), fall of 2013 (Translation to English, refactored, comments, anti collision, cascade levels.)
 * Released into the public domain.
 *
 * Sample program showing how to read data from a PICC using a MFRC522 reader on the Arduino SPI interface.
 *----------------------------------------------------------------------------- empty_skull 
 * Aggiunti pin per arduino Mega
 * add pin configuration for arduino mega
 * http://mac86project.altervista.org/
 ----------------------------------------------------------------------------- Nicola Coppola
 * Pin layout should be as follows:
 * Signal     Pin              Pin               Pin
 *            Arduino Uno      Arduino Mega      MFRC522 board
 * ------------------------------------------------------------
 * Reset      9                5                 RST
 * SPI SS     10               53                SDA
 * SPI MOSI   11               52                MOSI
 * SPI MISO   12               51                MISO
 * SPI SCK    13               50                SCK
 *
 * The reader can be found on eBay for around 5 dollars. Search for "mf-rc522" on ebay.com. 
 */

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 10
#define RST_PIN 9
MFRC522 (SS_PIN, RST_PIN);  // Create MFRC522 instance.

void setup() {
Serial.begin(9600); // Initialize serial communications with the PC
SPI.begin();  // Init SPI bus
MFRC522 mfrc522.PCD_Init(); // Init MFRC522 card
Serial.println("Scan PICC to see UID and type...");
}

void loop() {
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}

// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}

// Dump debug info about the card. PICC_HaltA() is automatically called.
mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
}

Now I don’t understand What I’m doing wrong. I can’t use the Int method cause that makes a constant number to be assigned, but I’m not adding a numeric value. Why am I getting these errors?

Arduino.ru

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Код ошибки «Arduino: 1.8.13 (Windows 10), Плата:»Arduino Nano, ATmega328P (Old Bootloader)»

In file included from C:UsersПенёкDocumentsArduinosketch_aug15asketch_aug15a.ino:4:0:

C:Users����DocumentsArduinolibrariesTime-master/Time.h:1:2: warning: #warning «Please include TimeLib.h, not Time.h. Future versions will remove Time.h» [-Wcpp]

#warning «Please include TimeLib.h, not Time.h. Future versions will remove Time.h»

sketch_aug15a:9:11: error: expected unqualified-id before numeric constant

C:UsersПенёкDocumentsArduinosketch_aug15asketch_aug15a.ino: In function ‘void setup()’:

sketch_aug15a:120:7: error: unable to find numeric literal operator ‘operator»»dig_display.init’

C:UsersПенёкDocumentsArduinosketch_aug15asketch_aug15a.ino: In function ‘void loop()’:

C:UsersПенёкDocumentsArduinosketch_aug15asketch_aug15a.ino:166:27: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]

sketch_aug15a:195:10: error: unable to find numeric literal operator ‘operator»»dig_display.display’

sketch_aug15a:197:10: error: unable to find numeric literal operator ‘operator»»dig_display.display’

sketch_aug15a:199:10: error: unable to find numeric literal operator ‘operator»»dig_display.display’

sketch_aug15a:201:10: error: unable to find numeric literal operator ‘operator»»dig_display.display’

sketch_aug15a:203:10: error: unable to find numeric literal operator ‘operator»»dig_display.point’

expected unqualified-id before numeric constant

Этот отчёт будет иметь больше информации с
включенной опцией Файл -> Настройки ->
«Показать подробный вывод во время компиляции»»
Сам код:
#include
#include
#include
#include
#include «TM1637.h»
#define CLK 6
#define DIO 5

TM1637 4dig_display(CLK, DIO);

// для данных времени

// для данных dd/mm

// для смены время / день-месяц

unsigned long millist=0;

OLED myOLED(4, 3, 4); //OLED myOLED(SDA, SCL, 8);

extern uint8_t SmallFont[];
extern uint8_t MediumNumbers[];
extern uint8_t BigNumbers[];

///// часы ..
byte decToBcd(byte val) <
return ( (val/10*16) + (val%10) );
>

byte bcdToDec(byte val) <
return ( (val/16*10) + (val%16) );
>

void setDateDs1307(byte second, // 0-59
byte minute, // 0-59
byte hour, // 1-23
byte dayOfWeek, // 1-7
byte dayOfMonth, // 1-28/29/30/31
byte month, // 1-12
byte year) // 0-99
<
Wire.beginTransmission(0x68);
Wire.write(0);
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(decToBcd(dayOfWeek));
Wire.write(decToBcd(dayOfMonth));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.endTransmission();
>

void getDateDs1307(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
<

Wire.beginTransmission(0x68);
Wire.write(0);
Wire.endTransmission();

*second = bcdToDec(Wire.read() & 0x7f);
*minute = bcdToDec(Wire.read());
*hour = bcdToDec(Wire.read() & 0x3f);
*dayOfWeek = bcdToDec(Wire.read());
*dayOfMonth = bcdToDec(Wire.read());
*month = bcdToDec(Wire.read());
*year = bcdToDec(Wire.read());
>

///// температура ..
float get3231Temp() <
byte tMSB, tLSB;
float temp3231;

Wire.beginTransmission(0x68);
Wire.write(0x11);
Wire.endTransmission();
Wire.requestFrom(0x68, 2);

if(Wire.available()) <
tMSB = Wire.read(); //2’s complement int portion
tLSB = Wire.read(); //fraction portion

temp3231 = (tMSB & B01111111); //do 2’s math on Tmsb
temp3231 += ( (tLSB >> 6) * 0.25 ); //only care about bits 7 & 8
>
else <
//oh noes, no data!
>

void setup()
<
Serial.begin(9600); // запустить последовательный порт

Serial.begin(9600);
myOLED.begin();
Wire.begin();

// установка часов
byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
second = 30;
minute = 0;
hour = 14;
dayOfWeek = 3; // день недели
dayOfMonth = 1; // день
month = 4;
year = 14;

//setDateDs1307(00, 40, 15, 6, 15, 8, 2020);

char time[10];
char data[11];

snprintf(time, sizeof(time),»%02d:%02d:%02d»,
hour, minute, second);

snprintf(data, sizeof(data), «%02d/%02d/%02d»,
dayOfMonth, month, year);

Источник

DIY Robotics Lab

Correcting Arduino Compiler Errors

(Intended) Errors and Omissions

What happens after you select the Arduino menu item Sketch -> Verify/Compile and you get error messages that your program failed to compile properly. Sometimes the compiler warnings help you spot the problem code. Other times the error messages don’t make much sense at all. One way to understand the error messages is to create some intentional errors and see what happens.

Create a new program named: LEDBlink_errors

This is one time when it is better to copy the following code so we don’t introduce more errors into the program than are already there.

If you run Verify/Compile command you should see a number of compiler error messages at the bottom of the dialog display.

Arduino Compiler Error Messages

Line 1 Error

Uncaught exception type:class java.lang.RuntimeException

java.lang.RuntimeException: Missing the */ from the end of a /* comment */

/*— Blink an LED —//

The error messages go on for several more lines without adding much information to help solve the problem. You will find a clue to the problem above the compiler message box stating:

“Missing the */ from the end of a /* comment */“.

The article “Introduction to Programming the Arduino” describes the comment styles used by C programs. The error on line 1 is caused by mixing the comment styles. The comment begins with the “/*” characters but ends with “//” instead of the “*/” characters. Correct the line as follows:

/*— Blink an LED —*/

Now, rerun the Verify/Compile command.

Line 4 Error

error: stray ‘’ in program

int ledPin = 23; We’re using Digital Pin 23 on the Arduino.

This is another problem with incorrect commenting technique. In this line the “” characters are used to begin a comment instead of the “//” characters. The correct line follows:

int ledPin = 3; //We’re using Digital Pin 3 on the Arduino.

Now, rerun the Verify/Compile command.

Line 6 Error

error: expected unqualified-id before ‘<’ token

void setup();

This is an easy mistake to make. The problem is the semicolon “;” at the end of a function declaration. The article “Learning the C Language with Arduino” contains a section about correct usage of semicolons. To correct this problem remove the semicolon as shown below:

void setup()

Now, rerun the Verify/Compile command.

Line 8 Error

In function ‘void setup()’:

error: expected `)’ before numeric constant/home/myDirectory/Desktop/myPrograms/arduino-0015/hardware/cores/arduino/wiring.h:102:

error: too few arguments to function ‘void pinMode(uint8_t, uint8_t)’ At global scope:

pinMode(ledPin OUTPUT); //Set up Arduino pin for output only.

The clue to this problem is found in the message “error: too few arguments to function ‘void pinMode(uint8_t, uint8_t)’“. The message includes a list of the function’s arguments and data types (uint8_t). The error is complaining that we have too few arguments. The problem with this line of code is the missing comma between ledPin, and OUTPUT. The corrected code is on the following line:

pinMode(ledPin, OUTPUT); //Set up Arduino pin for output only.

Now, rerun the Verify/Compile command.

Line 11 Error

error: expected constructor, destructor, or type conversion before ‘(’ token

loop()

In this line the type specifier for the function is missing.

To fix this problem place the data type for the function’s return type. In this case we’re not returning any value so we need to add the keyword void in front of the loop function name. Make the following change:

void loop()

Now, rerun the Verify/Compile command.

Line 12 Error

error: function ‘void loop()’ is initialized like a variable

The block of code that makes up the loop function should be contained within curly braces “<“ and “>”. In this line a left parenthesis character “(“ is used instead of the beginning curly brace “<“. Replace the left parenthesis with the left curly brace.

Now, rerun the Verify/Compile command.

Line 13 Error

error: expected primary-expression before ‘/’ token At global scope:

/The HIGH and LOW values set voltage to 5 volts when HIGH and 0 volts LOW.

This line is supposed to be a comment describing what the program is doing. The error is caused by having only one slash character “/” instead of two “//”. Add the extra slash character then recompile.

//The HIGH and LOW values set voltage to 5 volts when HIGH and 0 volts LOW.

Line 14 Error

error: ‘high’ was not declared in this scope At global scope:

digitalWrite(ledPin, high); //Setting a digital pin HIGH turns on the LED.

This error message is complaining that the variable “high” was not declared. Programming in C is case sensitive, meaning that it makes a difference if you are using upper or lower case letters. To solve this program replace “high” with the constant value “HIGH” then recompile.

digitalWrite(ledPin, HIGH); //Setting a digital pin HIGH turns on the LED.

Line 15 Error

error: expected `;’ before ‘:’ token At global scope:

delay(1000): //Get the microcontroller to wait for one second.

This error message is helpful in identifying the problem. This program statement was ended with a colon character “:” instead of a semicolon “;”. Replace with the proper semicolon and recompile.

delay(1000); //Get the microcontroller to wait for one second.

Line 16 Error

error: expected unqualified-id before numeric constant At global scope:

digitalWrite(ledPin. LOW); //Setting the pin to LOW turns the LED off.

This error can be particularly troublesome because the comma “,” after the variable ledPin is actually a period “.” making it harder to spot the problem.

The C programming language allows you to build user defined types. The dot operator (period “.”) is part of the syntax used to reference the user type’s value. Since the variable ledPin is defined as an integer variable, the error message is complaining about the unqualified-id.

digitalWrite(ledPin, LOW); //Setting the pin to LOW turns the LED off.

Line 17 Error

In function ‘void loop()’:

error: ‘Delay’ was not declared in this scope At global scope:

Delay(1000); //Wait another second with the LED turned off.

This error was caused by the delay function name being spelled with an incorrect upper case character for the letter “d”. Correct the spelling using the lower case “d” and try the Sketch Verify/Compile again.

delay(1000); //Wait another second with the LED turned off.

Line 18 Error

error: expected declaration before ‘>’ token

There is an extra curly brace at the end of this program. Delete the extra brace to correct this error.

Now, rerun the Verify/Compile command.

Success (or so it seems)

The compiler completed without any more error messages so why doesn’t the LED flash after loading the program on my Arduino?

Line 4 Error

No error message was given by the compiler for this problem.

int ledPin = 23; We’re using Digital Pin 23 on the Arduino.

The Digital pins are limited to pin numbers 0 through 13. On line 4 the code is assigning a non-existant pin 23 to the ledPin variable. Change the pin assignment to pin 3 and the program should compile, upload to your Arduino and flash the LED if everything is wired properly on your breadboard.

int ledPin = 3; We’re using Digital Pin 3 on the Arduino.

(c) 2009 – Vince Thompson

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2 Responses to “Correcting Arduino Compiler Errors”

[…] Robotics Lab Bringing Robotics Home « Microcontrollers as Time Keepers Correcting Arduino Compiler Errors […]

Nice, thank you.
The “stray ‘’ in program” error can also occurs if there’s an accent (like è) in the name of a function.

Источник

Arduino.ru

exit status 1 Error compiling for board Arduino/Genuino Uno.

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можно задать ворос что произашло при загрузки програми которая работала день назад видает теперь

exit status 1
Error compiling for board Arduino/Genuino Uno.

вот все что мне написал компилятор
D:arduino-nightlylibrariesDS1307/DS1307.h:54:17: error: expected identifier before numeric constant

#define SUNDAY 7

D:arduino-nightlylibrariesDS1307/DS1307.h:54:17: error: expected ‘>’ before numeric constant

D:arduino-nightlylibrariesDS1307/DS1307.h:54:17: error: expected unqualified-id before numeric constant

In file included from C:UsersdimaDesktopfinalsketch_nov05asketch_nov05a.ino:4:0:

c:usersdimaappdatalocalarduino15packagesarduinotoolsavr-gcc4.9.2-atmel3.5.3-arduino2avrincludetime.h:506:1: error: expected declaration before ‘>’ token

Using library DHT-sensor-library-master at version 1.2.3 in folder: D:arduino-nightlylibrariesDHT-sensor-library-master
Використання бібліотеки LedControlMS з теки: D:arduino-nightlylibrariesLedControlMS (legacy)
Використання бібліотеки DS1307 з теки: D:arduino-nightlylibrariesDS1307 (legacy)
Using library Wire at version 1.0 in folder: C:UsersdimaAppDataLocalArduino15packagesarduinohardwareavr1.6.14librariesWire
Using library Adafruit-BMP085-Library-master at version 1.0.0 in folder: D:arduino-nightlylibrariesAdafruit-BMP085-Library-master
exit status 1
Error compiling for board Arduino/Genuino Uno.

Источник

arduino_compilation_errors

filename.test:10: error: expected constructor, destructor, or type conversion before '(' token
expected constructor, destructor, or type conversion before '(' token

programname:7107:27: error: expected initializer before numeric constant
  const byte variablename value

const byte variablename = value;

expected unqualified-id before 'if'

filename:520: error: expected ')' before ';' token

Serial.println(variable A;variable B;variable C;variable D);

Serial.print(variable A);
Serial.print(";");
Serial.print(variable B);
Serial.print(";");
Serial.print(variable C);
Serial.print(";");
Serial.print(variable D);
Serial.println(";");

/somesketch.ino: In function 'void setup()':
somesketch:7432:38: error: expected ')' before ';' token
   Serial.println(F("sometext");
exit status 1
expected ')' before ';' token

a function-definition is not allowed here before '{' token

/home/user/sketchbook/someprojectNameTheDirectory
/someprojectName.ino: In function 'void setup()':
someprojectName:7401:5: error: 'functionName or variableName' was not declared in this scope
     ^~~~~~~~~~~~~~~~~~~

exit status 1
'functionName or variableName' was not declared in this scope

ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second:

note: candidate 1: uint8_t TwoWire::requestFrom(int, int) uint8_t requestFrom(int, int);

(Intended) Errors and Omissions

What happens after you select the Arduino menu item Sketch -> Verify/Compile and you get error messages that your program failed to compile properly. Sometimes the compiler warnings help you spot the problem code. Other times the error messages don’t make much sense at all. One way to understand the error messages is to create some intentional errors and see what happens.

Create a new program named: LEDBlink_errors

This is one time when it is better to copy the following code so we don’t introduce more errors into the program than are already there.

/*--- Blink an LED  ---//
//Associate LEDs with an Arduino Digital pin.
//The Arduino already has a built-in LED that we can use on Digital Pin 13.
int ledPin = 23;  We're using Digital Pin 23 on the Arduino.

void setup();
{
   pinMode(ledPin OUTPUT);   //Set up Arduino pin for output only.
}

loop()
(
   /The HIGH and LOW values set voltage to 5 volts when HIGH and 0 volts LOW.
   digitalWrite(ledPin, high); //Setting a digital pin HIGH turns on the LED.
   delay(1000):  //Get the microcontroller to wait for one second.
   digitalWrite(ledPin. LOW);  //Setting the pin to LOW turns the LED off.
   Delay(1000);  //Wait another second with the LED turned off.
   }
}

If you run Verify/Compile command you should see a number of compiler error messages at the bottom of the dialog display.

Line 1 Error

Uncaught exception type:class java.lang.RuntimeException

java.lang.RuntimeException: Missing the */ from the end of a /* comment */

at processing.app.Sketch.scrubComments(Sketch.java:2008) …

/*— Blink an LED  —//

The error messages go on for several more lines without adding much information to help solve the problem. You will find a clue to the problem above the compiler message box stating:

“Missing the */ from the end of a /* comment */“.

The article “Introduction to Programming the Arduino” describes the comment styles used by C programs. The error on line 1 is caused by mixing the comment styles. The comment begins with the “/*” characters but ends with “//” instead of the “*/” characters. Correct the line as follows:

/*— Blink an LED  —*/

Now, rerun the Verify/Compile command.

Line 4 Error

error: stray ‘’ in program

int ledPin = 23; We’re using Digital Pin 23 on the Arduino.

This is another problem with incorrect commenting technique. In this line the “” characters are used to begin a comment instead of the “//” characters. The correct line follows:

int ledPin = 3;  //We’re using Digital Pin 3 on the Arduino.

Now, rerun the Verify/Compile command.

Line 6 Error

error: expected unqualified-id before ‘{’ token

void setup();

This is an easy mistake to make. The problem is the semicolon “;” at the end of a function declaration. The article “Learning the C Language with Arduino” contains a section about correct usage of semicolons. To correct this problem remove the semicolon as shown below:

void setup()

Now, rerun the Verify/Compile command.

Line 8 Error

In function ‘void setup()’:

error: expected `)’ before numeric constant/home/myDirectory/Desktop/myPrograms/arduino-0015/hardware/cores/arduino/wiring.h:102:

error: too few arguments to function ‘void pinMode(uint8_t, uint8_t)’ At global scope:

pinMode(ledPin OUTPUT); //Set up Arduino pin for output only.

The clue to this problem is found in the message “error: too few arguments to function ‘void pinMode(uint8_t, uint8_t)’“. The message includes a list of the function’s arguments and data types (uint8_t). The error is complaining that we have too few arguments. The problem with this line of code is the missing comma between ledPin, and OUTPUT. The corrected code is on the following line:

pinMode(ledPin, OUTPUT); //Set up Arduino pin for output only.

Now, rerun the Verify/Compile command.

Line 11 Error

error: expected constructor, destructor, or type conversion before ‘(’ token

loop()

In this line the type specifier for the function is missing.

To fix this problem place the data type for the function’s return type. In this case we’re not returning any value so we need to add the keyword void in front of the loop function name. Make the following change:

void loop()

Now, rerun the Verify/Compile command.

Line 12 Error

error: function ‘void loop()’ is initialized like a variable

(

The block of code that makes up the loop function should be contained within curly braces “{“ and “}”. In this line a left parenthesis character “(“ is used instead of the beginning curly brace “{“. Replace the left parenthesis with the left curly brace.

Now, rerun the Verify/Compile command.

Line 13 Error

error: expected primary-expression before ‘/’ token At global scope:

/The HIGH and LOW values set voltage to 5 volts when HIGH and 0 volts LOW.

This line is supposed to be a comment describing what the program is doing. The error is caused by having only one slash character “/” instead of two “//”. Add the extra slash character then recompile.

//The HIGH and LOW values set voltage to 5 volts when HIGH and 0 volts LOW.

Line 14 Error

error: ‘high’ was not declared in this scope At global scope:

digitalWrite(ledPin, high); //Setting a digital pin HIGH turns on the LED.

This error message is complaining that the variable “high” was not declared. Programming in C is case sensitive, meaning that it makes a difference if you are using upper or lower case letters. To solve this program replace “high” with the constant value “HIGH” then recompile.

digitalWrite(ledPin, HIGH); //Setting a digital pin HIGH turns on the LED.

Line 15 Error

error: expected `;’ before ‘:’ token At global scope:

delay(1000): //Get the microcontroller to wait for one second.

This error message is helpful in identifying the problem. This program statement was ended with a colon character “:” instead of a semicolon “;”. Replace with the proper semicolon and recompile.

delay(1000); //Get the microcontroller to wait for one second.

Line 16 Error

error: expected unqualified-id before numeric constant At global scope:

digitalWrite(ledPin. LOW); //Setting the pin to LOW turns the LED off.

This error can be particularly troublesome because the comma “,” after the variable ledPin is actually a period “.” making it harder to spot the problem.

The C programming language allows you to build user defined types. The dot operator (period “.”) is part of the syntax used to reference the user type’s value. Since the variable ledPin is defined as an integer variable, the error message is complaining about the unqualified-id.

digitalWrite(ledPin, LOW); //Setting the pin to LOW turns the LED off.

Line 17 Error

In function ‘void loop()’:

error: ‘Delay’ was not declared in this scope At global scope:

Delay(1000); //Wait another second with the LED turned off.

This error was caused by the delay function name being spelled with an incorrect upper case character for the letter “d”. Correct the spelling using the lower case “d” and try the Sketch Verify/Compile again.

delay(1000); //Wait another second with the LED turned off.

Line 18 Error

error: expected declaration before ‘}’ token

}

}

There is an extra curly brace at the end of this program. Delete the extra brace to correct this error.

Now, rerun the Verify/Compile command.

Success (or so it seems)

The compiler completed without any more error messages so why doesn’t the LED flash after loading the program on my Arduino?

Line 4 Error

No error message was given by the compiler for this problem.

int ledPin = 23; We’re using Digital Pin 23 on the Arduino.

The Digital pins are limited to pin numbers 0 through 13. On line 4 the code is assigning a non-existant pin 23 to the ledPin variable. Change the pin assignment to pin 3 and the program should compile, upload to your Arduino and flash the LED if everything is wired properly on your breadboard.

int ledPin = 3; We’re using Digital Pin 3 on the Arduino.

(c) 2009 – Vince Thompson

Tags: Arduino, C Language, error correction, error message, how-to program, programming

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