What does return -1 do in a function called in main?

[Beyond Humanity]

What does return -1 inside of a function that is in main?
Is there a difference between returning different numbers, i.e: "return -1", "return 7", "return 2"... ?

int myFunction()
{
//Start of code
//CODE
//End of code


return -1;
}


int main()
{
myFunction();

return 0;


}

[Repeater]

Edit: Oops. Ignore me. I misread the question as "what's the meaning of returning -1 from main".

[Ganado]

You are not using the return value of myFunction, so no, it does not matter in your case.

To actually get the return value, you'd have to assign it to a variable

int a = myFunction();
std::cout << a << std::endl;

or call it directly
std::cout << myFunction() << std::endl;

When returning a value from main (0 in your case), the return value can be used by external programs for scripts or other tools (for example, %errorlevel% in Windows), but the value returned from main doesn't affect the logic of the program itself.