#include<stdio.h>

int a = 700;

int foo(int *a, int *b){
	*a = *b * 2;
	*b = 5;
	return *b;
}

int main(){
	int a = 4, b = 6;
	a = foo(&b, &a);
	printf("a = %d\nb = %d\n", a, b);
	return 0;
}