/* File: average3.c

   This version has main on top.
   Needs function prototypes.
*/

#include <stdio.h>

double average(int, int) ;
int add_two(int) ;

int main() {
   
   int num1 ;
   double a ;

   num1 = 17 ;

   a = average(num1, add_two(42) ) ;

   printf("The avearge of %d and %d is %lf\n",
      num1, add_two(42), a) ;

   return 0 ;
}


double average(int x, int y) {
   double r ;

   r = (x + y) / 2.0 ;
   return r ;
}


int add_two(int x) {
   int y ; 

   y = x + 2; 
   return y ;
}