Introduction

I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.

Reverse a Number using while loop

#include <iostream>
#include <math.h>
 
using namespace std;
 
int main()
{
    int num,i;
    long long fact=1;
 
    //Reading a number from user
    cout<<"Enter any number to calculate factorial:";
    cin>>num;
 
    fact = 1;
    i = 1;
 
    //Run loop from 1 to number entered by user
    while(i <= num)
    {
        fact = fact * i;
        i++;
    }
 
    cout<<"Factorial of "<<num <<" is: "<<fact; ;
 
    return 0;
}

Reverse a Number using for loop

#include <iostream>
#include <math.h>
 
using namespace std;
 
int main()
{
    int num,i;
    long long fact=1;
 
    //Reading a number from user
    cout<<"Enter any number to calculate factorial:";
    cin>>num;
 
    fact = 1;
    i = 1;
 
    //Run loop from 1 to number entered by user
    for(i=1; i<=num; i++)
    {
        fact = fact * i;
    }
 
    cout<<"Factorial of "<<num <<" is: "<<fact; ;
 
    return 0;
}
 

Result