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C++ program to find the factorial of a number using class

Given a number, we have to find its factorial using class and object approach.
Submitted by Shubh Pachori, on August 04, 2022

Problem statement

You are given an integer number, write a C++ program to find its factorial using class in C++.

Example

Input: Enter Number: 5
Output: Factorial of 5 is 120

C++ code to find out the factorial of a number using class and object approach

#include <iostream>
using namespace std;

// create a class
class Factorial {
  // declare a private data member
 private:
  int number;

  // a public function with a int type parameter
 public:
  void factorial(int n) {
    // copying the value of parameter in data member
    number = n;

    // declare two int type variable for operating
    int index, factorial = 1;

    // for loop to find factorial of the number
    for (index = number; index >= 1; index--) {
      // multiply the number in the factorial
      factorial *= index;
    }

    // printing the factorial
    cout << "Factorial of " << number << " is " << factorial << endl;
  }
};

int main() {
  // create a object
  Factorial F;

  // declare a int type variable to store number
  int n;

  cout << "Enter Number: ";
  cin >> n;

  // calling function by object
  F.factorial(n);

  return 0;
}

Output

Enter Number: 5
Factorial of 5 is 120

Explanation

In the above code, we have created a class Factorial, one int type data member number to store the number, and a public member function factorial() to find the factorial of the given integer number.

In the main() function, we are creating an object F of class Factorial, reading an integer number by the user, and finally calling the factorial() member function to find the factorial of the given integer number. The factorial() function contains the logic to find the factorial of the given number and printing the result.

C++ Class and Object Programs (Set 2) »