c++cwarnings

How to generate compiler warning "statement has no effect" in c/c++ code

For my compiler tests, I need to generate this warning "Statement has no effect" in my test code. How can I do this?

Using VS cl.exe compiler

Solution 
  • int main()
{
    5;   // Statement has no effect
    return 0;
}

    Edit 1 Tried on VC++ 2010

    #include <iostream>
#pragma warning(default:4555)

int main()
{
    5;
    getchar();
    return 0;
}

    Output :

    warning C4555:main.cpp(6): expression has no effect; expected expression with side-effect

    NOTE: It seems VC++ 2010 has no C4705 warning on their list. MSDN Compiler Warnings