[C/Cpp] the greatest common divisor, the least common multiple

#include<stdio.h>
 
void main()
{
    int a,b,c,d;
    printf("Input two numbers for 'greatest common divisor' and 'least common multiple' : ");
    scanf("%d %d", &a, &b);
 
    d=a*b;
    while(a%b != 0){
        c=a%b;
        a=b;
        b=c;
    }
 
    printf("The greatest common divisor = %d\nThe least common multiple = %d\n", b, d/b);
 
}