Thread: Even or Odd (practice problem)

i'm guessing the problem is that the function even() is called before it is defined.

Code:

int odd(int);
int even(int);

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                */
}