Thread: Even or Odd (practice problem)

This is not homework but it is supposed to be the third warm up before I actually begin the homework. I asked my lab instructor but he said to declare the function but i do not know what he is talking about. It stops when it hits the

Code:

 return ( even( n - 1 ));	/*     n is odd if and only n-1 is even

I have deleted it, but when i do that the comp says everything is odd

Code:

 #include <stdio.h>


int odd(int n)
{
   if ( n == 1 )	/*     if n is 1 then it is certainly true that it is odd      */
      return ( 1 );
   else
      return ( even( n - 1 ));	/*     n is odd if and only n-1 is even                */
}

int even(int n)
{
   if ( n == 0 )	/*     if n is 0 then it is certainly true that it is even    */
      return ( 1 );
   else
      return ( odd( n - 1) );	/*     n is even if and only n-1 is odd                */
}

main()
{
   int N;

   printf("Please input a n integer.\n");
   scanf("%d", &N);

   if ( odd(N) )
        printf("The number %d is odd.\n", N);
   else
        printf("The number %d is even.\n", N);
}