（1）用函数实现最大公约数与最小公倍数

#include<stdio.h>
int main()
{
  int gcd(int a, int b);
  int lcm(int m, int n);
  int m, n;
  scanf("%d%d", &m, &n);
  printf("%d\n", gcd(m, n));
  printf("%d\n", lcm(m, n));
  return 0;
}
int gcd(int a, int b)
{
  int t;
  while (b > 0)
  {
    t = b;
    b = a % b;
    a = t;
  }
  return a;
}
int lcm(int m, int n)
{
  int l;
  int gcd(int x, int y);
  l = m / gcd(m, n)*n;
  return l;
}