#include<stdio.h>void f1 (int a, int b){int c;c = a; a = b; b = c;}void f2 (int *a, int *b){int c;c = *a; *a = *b; *b = c;}int main(){int a = 4, b = 5, c = 6;f1(a, b);f2(&b, &c);printf("%d", c - a - b);}