.输入两个正整数m和n,求其最大公约数和最小公倍数.这个程序怎么编啊?

#include
//求最大公约数
void GreatestCommonDivisor()
{
while (1)
{
int m = 0,n = 0;
printf("input m:b");
scanf("%d",&m);
getchar();
printf("input n:b");
scanf("%d",&n);
if (m == 0 || n == 0) return;
if (m n) n :m;
int c = 0;
while ((a % b) != 0)
{
c = a % b;
a = b;
b = c;
}
printf("%d and %d GreatestCommonDivisor = %dn",m,n,b);
printf("%d and %d 最小公倍数为:%dn",m,n,b/n);
}
}
int main()
{
GreatestCommonDivisor();
return 0;
}