how to solve this bug??

when i run this code
instead of getting some expected out put i get

line 17: `main' must return `int'

but main is a void function

it cant return int
???

Code:

#include <stdio.h>
int a(int n,int count){
      int i;
      for(i=0;i<n;i++)
           count =a(i,count);
           return count+1;
}

int b(int n,int count) {
  int i;
  count =a(n,count);
     for(i=0;i<n;i++)
     count =b(i,count);
     return count;
  }

  void main (){
    int i;
    for (i=0;i<4;i++)
      printf("%d",a(i,0));
      printf("\n%d\n",a(i,10));

      for (i=0;i<4;i++)
        printf("%d",b(i,0));
        printf("\n%d\n",b(i,10));

  }

Actually it is telling you that try as you may, you aren't supposed to ever have it be void.

Just change it to int. The return value is optional.

but its a void function

i dont want it to return integer

why its a bug
why main cannot be void??

The people (ANSI/ISO committee) who are in charge of C say so. And for that matter, you may not want it to return an integer, but Windows/Linux/OS X/various other operating systems certainly do.

It isn't a bug per se, so much as its just breaking of the standard. In other words, how can it be a bug if it won't compile without complaint? I would reserve the word bug for those pesky things that your compiler doesn't mention to you.

i copied this code from a test question which asks to find the output of this code

and the answer is some numbers

there is no way that this code has a bug
i cant see what did i missed

this is the original stuff
did i missed some thing

http://img216.imageshack.us/my.php?i...5165572gm4.gif

??

Think that when the main program finishes it will return an int. That information might be helpful or even vital for the OS to know if the program succeeded or not. The default is return 0

Originally Posted by transgalactic2

i copied this code from a test question which asks to find the output of this code

and the answer is some numbers

there is no way that this code has a bug
i cant see what did i missed

this is the original stuff
did i missed some thing

http://img216.imageshack.us/my.php?i...5165572gm4.gif

??

Generally, in C both types can be used. Either void main or int main. Just int main is preferred so why not use it? You are getting a warning or an error?

The first thing you need to realise is the world is knee deep in idiots who think void main (and lots of other horrors) are perfectly valid C.

Unfortunately, many of these people tend to write books or teach at 2nd rate universities, rather than be professional programmers.

Ok lets break this into a more general thing.

You: Matt how do you enter a C program?
Me: Well Billy, you simply create a main() function.
You: main() function?
Me: According to the C standard, a main() function can take one of two forms.
You: Can you post them in code tags since you can't possibly demonstrate this concept verbally?
Me: Haha Billy, of course I can.

(Matt pats Billy on the head)

Example:

Code:

/*
 *  First form: With no parameters.
 */
int main(void)
{
  return 0;
}

/*
 * Second form: With parameters.
 */
int main(int argc, char **argv)
{
  return 0;
}

Anything else would be wrong.

Untitled2.c|17|error: `main' must return `int'|
||=== Build finished: 1 errors, 0 warnings ===|

So change it to int, already.

(It won't affect your instructor's answer.)

Again, be proud that your compiler absolutely refuses to accept your function. Many will demote this practice down to a mere warning.

Again I say just change the void to an int and your code will compile with no other changes to your code.

Is there some problem with the dictionary definition of "must" which is troubling you?

Just change the void to int, and put a return 0; at the end and get on with life!

this is what he wrote

this is the code i must inspect

i get the idea that he made a mistake
thanks