程序无报错，运行不出结果

Question

问题遇到的现象和发生背景

求两个正整数的最大公约数和最小公倍数的题

问题相关代码，请勿粘贴截图

#include<stdio.h>
#include<windows.h>
unsigned int divisor(unsigned int a, unsigned int b)
{
unsigned int r;
r = a % b;
while (r != 0)
{
a = b; b = r;
}return b;
}
unsigned int multiple(unsigned int a, unsigned int b)
{
unsigned int d;
d = divisor(a, b);
printf("%d", d);
unsigned int e;
e = a * b / d;
return e;
}
main()
{
unsigned int a, b, c;
scanf_s("%d,%d", &a, &b);
c = multiple(a, b);
printf("%d", c);
}

运行结果及报错内容

我输入2，3
运行不出来，没有结果

我的解答思路和尝试过的方法

我想要达到的结果

Answer 1

while (r != 0)
{
a = b; b = r;
}
divisor 函数 进死循环了！出不来！