C++ program to Calculate Factorial of a Number Using Recursion

In this tutorial you will learn about the C++ program to Calculate Factorial of a Number Using Recursion and its application with practical example.

In this tutorial, we will learn to create a C++ program that will Calculate Factorial of a Number Using Recursion using C++ programming.

Table Of Contents−

C++ program to Calculate Factorial of a Number Using Recursion

What is factorial?

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C++ programming topics:

Operators in C++ Programming.
Basic Input and Output function in C++ Programming.
Basic C++ programming.

Conditional Statements in C++ programming.
Arithmetic operations in C++ Programming.

What is factorial?

The factorial means the product of the input number and its below integer value up to 1.

For example:- Factorial of 5 means

Factorial = 5 * 4 * 3 * 2 * 1

Hence, the factorial will be 120.

For example:- Factorial of 5 means

Factorial = 5 * 4 * 3 * 2 * 1

Hence, the factorial will be 120.

Algorithm:-

1. Declaring the required variables for the program.

2. Sending message to enter a number for finding the factorial of the number.

3. Taking the input number from the user for factorial.

4. Calculating Factorial of a Number Using Recursion of that number.

5. Printing the result numbers.

6. End Program.

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						1. Declaring the required variables for the program.
 
2. Sending message to enter a number for finding the factorial of the number.
 
3. Taking the input number from the user for factorial.
 
4. Calculating Factorial of a Number Using Recursion of that number.
 
5. Printing the result numbers.
 
6. End Program.

Program to Calculate Factorial Using Recursion

Today, we will create a C++ program that will take the input number from the user and then will find the factorial for the input integer value using a recursion program.

Program Code:–

#include<iostream>
using namespace std;
//user-defined function for factorial
int factorial(int no);

int main()
{
    //declaring the variable for the program.
    int no;
    //no = it will hold the integer value number from the user for finding factorial .
     
    //Taking the input number from the user.
    cout << "Enter a positive integer: ";
    cin >> no;
    //printing the output for the program.
    cout << "Factorial of " << no << " = " << factorial(no);

    return 0;
}

int factorial(int no)
{
    if(no > 1)
        return no * factorial(no - 1);
    else
        return 1;
}

#include<iostream>

using namespace std;

//user-defined function for factorial

int factorial(int no);

int main()

{

//declaring the variable for the program.

int no;

//no = it will hold the integer value number from the user for finding factorial .

//Taking the input number from the user.

cout << "Enter a positive integer: ";

cin >> no;

//printing the output for the program.

cout << "Factorial of " << no << " = " << factorial(no);

return 0;

}

int factorial(int no)

{

if(no > 1)

return no * factorial(no - 1);

else

return 1;

}

Output:-

In the above program, we have first initialized the required variable.

no = it will hold the integer value.

Taking input from the user the base number for finding factorial.

Declaring the function.

Body of the function.

Program Logic Code to print.

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C++ program to Calculate Factorial of a Number Using Recursion