Conio h c ошибка

Во-первых, conio.h — это не часть стандарта. Раньше Borland и MS его поддерживали, но сейчас это отключено. Поэтому все старые примеры, в которых есть этот заголовок, надо поправить.

Предлагаю следующее: уберите строчки #include <conio.h> и _getch(); из программы. И замените cprintf на printf. Также нет простого способа установить цвет, поэтому уберём пока textbackground и textcolor. После этого она должна заработать. Если этого хватает, то хорошо.

Если же надо, чтобы консоль не закрывалась сразу, то надо чуть-чуть дополнить программу. Это можно сделать, например, добавив вызов следующей функции:

#include <iostream>
#include <limits>

void PressEnterToContinue()
{
  std::cout << "Press ENTER to continue... " << flush;
  std::cin.ignore( std::numeric_limits <std::streamsize> ::max(), 'n' );
}

Тогда программа будет выглядеть примерно так:

#include "stdafx.h"
#include <stdio.h>
#include <iostream>
#include <limits>

void PressEnterToContinue()
{
  std::cout << "Press ENTER to continue... " << flush;
  std::cin.ignore( std::numeric_limits <std::streamsize> ::max(), 'n' );
}

int main()
{
  float a = 5.5;
  float b = 1.5;
  float c = 3.3;
  printf ("BLA BLA  "); 
  PressEnterToContinue();
}

TL;DR

You basically have 2 choices on how to proceed. You can either install a package that includes conio.h + its library as I describe below or you can use ncurses.h + its library and swap out and/or remove function calls that depend on it as @Ashish Kulkarni describes in his answer. Either option is viable and is up to the developer/implementer to decide which is the «correct» path.

The conio.h header + library for C/C++ is not something you’ll typically find as being installed by default with most Linux distros. At least not the ones that I’m familiar with Fedora/CentOS/RHEL/Debian/Ubuntu.

NOTE:: Also the use of ncurses.h is not appropriate here either, since that library will likely not include any of the functions that you’re looking for (clrscr(), getch(), etc.) since your .cpp file would seem to be coming from a Windows environment originally.

However you have the option with Linux to install packages from centrally managed repositories. Looking for a package that includes conio.h on my Fedora system I turned up this package. I realize you’re on Ubuntu but on Fedora the package is called libconio that provides exactly the libraries that you’re looking for.

$ yum info libconio.i686
Loaded plugins: auto-update-debuginfo, changelog, langpacks, refresh-packagekit
Available Packages
Name        : libconio
Arch        : i686
Version     : 1.0.0
Release     : 3.2
Size        : 6.3 k
Repo        : rpm-sphere
Summary     : Implementation of conio.h functions
License     : GPL
Description : libconio is an implementation of conio.h functions that some 
            : DOS and Windows compilers provide. It's purpose is to allow 
            : developers to use functions like getch, getche, textcolor and 
            : others in a linux environment.

Looking on a Ubuntu system I have there’s a similar package called elks-libc that also contains conio.h.

$ apt-cache show elks-libc
Package: elks-libc
Priority: optional
Section: devel
Installed-Size: 651
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Juan Cespedes <cespedes@debian.org>
Architecture: all
Source: linux86
Version: 0.16.17-3.1ubuntu3
Replaces: bcc (<< 0.14.9), linux86
Recommends: bcc (= 0.16.17-3.1ubuntu3)
Conflicts: linux86
Filename: pool/main/l/linux86/elks-libc_0.16.17-3.1ubuntu3_all.deb
Size: 214574
MD5sum: 75d87d8c2c906579ec84624fff93d76d
SHA1: 5cd6d3b9c5a881ad5fcdcffbd5a075761b017731
SHA256: 57bee73becbeae5dc2bc4cd859c13dc065e4a49472d876225e3e37fd6538feb2
Description-en: 16-bit x86 C library and include files
 This is the C library used to compile with bcc. It includes all the
 headers and static libraries needed to build 16-bit applications,
 for Linux/8086, Linux/i386 and DOS .COM executables.
Description-md5: 2da04d6881989db1f4a11df4a992c06f
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
Supported: 18m

And here’s the file:

$ apt-file list elks-libc | grep conio.h
elks-libc: /usr/lib/bcc/include/conio.h

So you can simply install this package to get the header file + libraries that your application requires to compile.

$ sudo apt-get install elks-libc

NOTE: You may need to adjust your include path to gcc to pick this header file up.

elks-libc is only for 8088 Intel processors

As mentioned in the comments, elks-libc is intended for use on system’s that are targeting the Intel 8088 CPU. You can instead download libconio.h from the SourceForge project titled: Linux c++ implementation of conio.h. You’ll have to install it manually but it shouldn’t be too difficult to do this.

Simple Linux implementation of Borland’s conio (conio.h) library. It uses Ncurses. It includes most functions required to write a basic application using conioh (i.e. getch(), cprintf(), puts() and more).

You can also get the entire libconio project’s source from this SourceForge project titled: libconio and unpack it.

Details on doing this as well as building it and compiling it are covered in this tutorial titled: How to use with GCC.

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