Ошибка main должен возвращать int

This my main function:

void main(int argc, char **argv)
{
    if (argc >= 4)
    {
        ProcessScheduler *processScheduler;
        std::cout <<
            "Running algorithm: " << argv[2] <<
            "nWith a CSP of: " << argv[3] <<
            "nFilename: " << argv[1] <<
            std::endl << std::endl;

        if (argc == 4)
        {
            processScheduler = new ProcessScheduler(
                argv[2],
                atoi(argv[3])
            );
        }
        else
        {
            processScheduler = new ProcessScheduler(
                argv[2],
                atoi(argv[3]),
                atoi(argv[4]),
                atoi(argv[5])
            );
        }
        processScheduler -> LoadFile(argv[1]);
        processScheduler -> RunProcesses();

        GanntChart ganntChart(*processScheduler);
        ganntChart.DisplayChart();
        ganntChart.DisplayTable();
        ganntChart.DisplaySummary();

        system("pause");

        delete processScheduler;
    }
    else
    {
        PrintUsage();
    }
}

The error I get when I compile is this:

Application.cpp:41:32: error: ‘::main’ must return ‘int’

It’s a void function how can I return int and how do I fix it?

C++ requires main() to be of type int.

answered Nov 2, 2016 at 14:14

I am currently using Putty virtual machine (UNIX) for my class, and we are doing a short C++ assignment. The assignment is to:
«Create a C++ program that tests to see if the file accounts exists and prints a message to say whether the file exists»

This is what I have, but when I try to compile the code, I get this error:
error: ‘::main’ must return ‘int’

#include<iostream>
#include<fstream>

using namespace std;
inline bool exists_test1 (const std::string& name) {

if (FILE *file = fopen(name.c_str(), "r")) {
fclose(file);
return true;
} else {
return false;
}
}

void main()
{
string s;
cout<<"Enter filename";
cin>>s;
bool ans =exists_test1(s);
if(ans)
{
cout<<"File Exist"<<endl;
}
else
{
cout<<"File Does not Exist";
}
}

asked Dec 5, 2016 at 3:47

The error message is trying to tell you that main must return int.

i.e. Line 21 should be int main() and at the end of your program you must return 0; // obviously only if the program executed successfully

return 0; is superfluous — main (and only main) returns 0 by default when the end of the function is reached.

For people who are new to programming who may not know that it is a good habbit to get into. Also, although somwhat a small amount, it makes the code more readable.