/* File: add2.c

   Exercising the add_two function.
*/

#include <stdio.h>

int add_two(int x) {
   int y ; 

   y = x + 2; 

   return y ;
}


int main() {
   int value, r ;

   // passing a constant
   r = add_two(3) ;
   printf("r = %d\n", r) ;

   // passing a variable's value
   value = 17 ;
   r = add_two(value) ;
   printf("r = %d\n", r) ;

   // passing an expression's value
   r = add_two(value + 9) ;
   printf("r = %d\n", r) ;

   // passing the return value from a function call
   r = add_two( add_two( 3 )  ) ;
   printf("r = %d\n", r) ;

   return 0 ;
}