2.find GCD and LCM of two numbers

#include<stdio.h>
int main()
{
int num1,num2,n1,n2,rem,lcm,gcd;
scanf("%d %d",&num1,&num2);
n1=num1;
n2=num2;
while(n2!=0)
{
rem=n1%n2;
n1=n2;
n2=rem;
}
gcd=n1;
lcm=num1*num2;
printf("gcd=%d",gcd);
printf("lcm=%d",lcm);
return 0;
}