#include <stdio.h>
#include <stdlib.h>

void gcd(int a , int b ){
	int temp , r;
	r = a % b;
	
	if(r!=0){
		if(b>a){
			temp = a;
			a = b;
			b = temp;
		}
		r = a % b;
		printf("gcd(%d,%d)\n",a,b);
		a = r;
		
		gcd(a,b);
	}else{
		printf("gcd(%d,%d)\n",b,a);
		printf("\nans = %d",b);
	}
}

int main(){
	int a , b ,ans;
	printf("輸入兩個正整數 ==> ");
	scanf("%d %d",&a,&b);
	gcd(a,b);
	return 0 ;
}