#include <stdio.h>
    #include "genlib.h"
    #include "simpio.h"
    
    int f (int a) ;
    int g (int b) ;
    
    main() {
       int a, b, c ;
       
       a = b = c =  0 ;
       a = f(b) ;
       c = g(a) ;
       printf("main: a = %d, b = %d, c= %d\n", a, b , c) ;
    }
    
    int f (int a) {
       int b, c ;
       
       b = 2 * a + 5 ;
       c = g(b) ;
       printf("f: a = %d, b = %d, c = %d\n", a, b, c) ;
       return(c) ;
    }
    
    int g (int b) {
       int a, c ;
       
       c = b + 7 ;
       a = c -2 ;
       printf("g: a = %d, b = %d, c = %d\n", a, b, c) ;     
       return(a) ;
    }