C++ Program for Reverse a Number

Program 1

//Program for reverse of digit
#include<iostream>
#define clrscr() system("cls")
using namespace std;
int main()
{
    int n,r,s=0; 
    clrscr();
    cout<<"Enter a number";
    cin>>n;
    while(n!=0)  
    {
        r=n%10;  
        s=s*10+r;
        n=n/10;  
    }
    cout<<"\nReverse Number is: "<<s;
return 0;
}