Calculate LCM in C

#include<stdio.h>
#include<conio.h>
int lcm(int n1,int n2);
void main()
{
  int n1,n2,x,y;
  clrscr();
  printf("\nEnter two numbers:");
  scanf("%d %d",&n1,&n2);

  printf("L.C.M is=%d",lcm(n1,n2));

  getch();
 }

// Function Definition


    int lcm(int n1,int n2)
  {
  int x,y,u;
  x=n1,y=n2;
  while(n1!=n2)
  {
if(n1>n2)
{
  n1=n1-n2;
}
 else
{
n2=n2-n1;
}
  }

u=(x*y)/n1;
return u;
   }