Writing a function to find even numbers

[luvnhandfull]

Can someone please explaine to me how to write a function program. Using prototypes just throws me.

Here is my prompt:
write a function called is _is even that has one input parameter and int called number which is a number the user wants to determine is even or not. The Function returns an integer which has a value of 1 if the number passed is even and has a value of 0 if the number passed is not even.

I'll paste the mess I came up with below.... Ugh
btw, i know it says to only write the function, but i'm going for the full program in hopes of better understanding it. My program compiles, but doesn't return anything.

#include <stdio.h>


int is_even(int number);

int main(void)
{
int number;
int answer;

printf("Enter a number: ");
scanf("%d", &number);

answer=is_even( number);

return;
}
int is_even(int number)
{
int answer=number%2 ;
if(answer==0)
return(1);
else
return(0);
}

[gsi]

Hi,
Your program indeed return's a garbage to the start up routine , since main() doesn't return a value. Regarding the expected output , the result is returned in to the variable answer in the line,
answer=is_even( number);

you have to print out the answer to stdout to view the result, say printf("%d",ans wer);

Hope this helps,

Thanks,
Gsi.

[yomama]

I don't understand the problem.

As written, your function returns to main() 1 if even and 0 if odd. Are you looking for it to do something more?

[luvnhandfull]

I don't understand the problem.

As written, your function returns to main() 1 if even and 0 if odd. Are you looking for it to do something more?

yes, i'm looking for it to print out the 1, or the 0 to the screen. when i run the program, it prompts for a number. I type one in and enter, nothing happens.

[luvnhandfull]

Hi,
Your program indeed return's a garbage to the start up routine , since main() doesn't return a value. Regarding the expected output , the result is returned in to the variable answer in the line,
answer=is_even( number);

you have to print out the answer to stdout to view the result, say printf("%d",ans wer);

Hope this helps,

Thanks,
Gsi.

Wow, thanks so much! I added a printf statement right after the
answer=is_even( number);
worked like a charm!! Thanks so much.

That was a question from my prior exam and i couldn't figure it out.

[yomama]

I see.

Something definitely happens; the value (1 or 0) is indeed stored in answer. But that's all that happens. If you want to see that value printed to your screen, you need a subsequent printf() to print the value stored in answer. Hope that helps.

[luvnhandfull]

I see.

Something definitely happens; the value (1 or 0) is indeed stored in answer. But that's all that happens. If you want to see that value printed to your screen, you need a subsequent printf() to print the value stored in answer. Hope that helps.

it did! Thanks for the quick response.... i'm yanking my hair out trying to think of all the things i couldn't do on the last test, incase they come up again on the next one.