I was writing a C++ program in visual studio 2013 and the program is very simple one and when I compile there was error this is third time I see this error. Here's the program:

#include <iostream>
using namespace std;
int main()
{ int x, y, z = 0; char c; bool quit = true; while (quit == true) { cout << "enter a number : "; cin >> x; cout << "enter a sign : "; cin >> c; cout << "enter another number : "; cin >> y; if (c == '+') z = x + y; if (c == '-') z = x - y; if (c == '*') z = x * y; if (c == '/' && y != 0) z = x / y; if (c == 'q') quit = false; cout << "Answer is : " << z << endl; } return 0;
}

...and here's the error:

1>------ Build started: Project: Calculator_madeByMe, Configuration: Debug Win32 ------
1> Source.cpp
1>MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
1>C:\Users\Sorena\documents\visual studio 2013\Projects\Calculator_madeByMe\Debug\Calculator_madeByMe.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========>

2

1 Answer

Your compiling as a Windows application, which does not use the "int main()" signature when calling the entry point.

Switch to a console application in Project -> Properties -> Linker -> System -> SubSystem -> Console. There might be more involved than just this setting, so if it still doesn't compile, remake your project and make sure to choose Console Application.