1011答案，不会的可参考，标准答案

#include<stdio.h>

int main(){

int gcd,a,b,t,lcm;

scanf("%d%d",&a,&b);

if(a>b){t=a;a=b;b=t;}

gcd=a;

while(1){

if(a%gcd==0&&b%gcd==0)break;

else --gcd;

}

printf("%d ",gcd);

lcm=a;

while(1){

if(lcm%a==0&&lcm%b==0)break;

else ++lcm;

}

printf("%d",lcm);

return 0;

}