warning: control reaches end of non-void function [-Wreturn-type]

Question

I am having a slight is regarding functions. I believe it is likely because I am not using them. My code is as follows:

/*date difference calculator*/

#incl         


        

Answer 1

You just need to return from the main function at some point. The error message says that the function is defined to return a value but you are not returning anything.

  /* .... */
  if (Date1 == Date2)  
     fprintf (stderr , "Indicating that the first date is equal to second date.\n"); 

  return 0;
}

Answer 2

You can also use EXIT_SUCCESS instead of return 0;. The macro EXIT_SUCCESS is actually defined as zero, but makes your program more readable.