int a, b,c;
	int r;
	printf("请输入两个正整数，以逗号分隔\n");
	scanf_s("%d ,%d", &a, &b);
	//如果a<b，交换a和b的值,此时a>b
	if (a<b)
	{
		c = a;
		a = b;
		b = c;
	}
	//辗转相除法
	//直至余数为零，跳出循环
	while (r != 0)
	{
		r = a % b;
		a = b;
		b = r;
		
	}
		printf("最大公约数为：%d\n", a);
		system("pause");
			getchar();
    return 0;