So what does “return 0” actually mean?

Question

I\'m pretty proficient in PHP, but I\'ve started dabbling with C. I\'ve seen the code

return 0;

at the end of functions that don\'t return

Answer 1

In C you don't have to return a value only if you declare a function with void at the start of it. First example:

#include 
 int main()
{
   printf("Hello World!");
    return 0; // you have to use return because main starting with int
}

Second Example:

#include 
void main()
{
printf("Hello World!");
//in this case return is useless, main is a void function

}