Program to check whether the number is an Armstrong number

#include<iostream.h>  
#include<conio.h>
void main()
{
    int sum=0,ch,i,j,num,no;
    char ans='y';
    clrscr();
    cout<<"\nEnter a number  : ";
    cin>>no;
    num=no;
    do
    {
        sum=sum+(no%10)*(no%10)*(no%10);
        no=no/10;
    }
    while(no!=0);

    if(sum==num)
        cout<<"\nThe number is an Armstrong number ";
    else
        cout<<"\nThe number is not an Armstrong number ";
     getch();
}