#include<iostream.h>
void main()
{
    int n;
    cout << "Enter a 2 digit number : ";
    cin >> n;
    if(n<=0 || n>99)
        cout<<"!!! Invalid Number !!!"<<endl;
    else
    {
        int n2 , n3;
        n2 = n % 10;
        n3 = n / 10;
        cout << "You Entered :  "<< n3<<n2<<endl;
        cout << "The reverse of that no is : "  << n2<<n3<<endl;
    }
}

Output:
Enter a 2 digit number : 61
You Entered :  61
The reverse of that no is : 16
Press any key to continue

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