C++ Exercises: Find the factorial of a number

Last update on April 07 2025 13:01:34 (UTC/GMT +8 hours)

7. Find the Factorial of a Number

Write a program in C++ to find the factorial of a number.

Visual Presentation:

C++ Exercises: Find the factorial of a number

Sample Solution :-

C++ Code :

#include <iostream> // Preprocessor directive to include the input/output stream header file

using namespace std; // Using the standard namespace to avoid writing std::

int main() // Start of the main function
{
    int num1, factorial = 1; // Declaration of integer variables 'num1' and 'factorial' initialized to 1

    cout << "\n\n Find the factorial of a number:\n"; // Display a message indicating the purpose
	cout << "------------------------------------\n"; // Display a separator line
	cout << " Input a number to find the factorial: "; // Prompting the user to input a number
	cin >> num1; // Reading the number entered by the user

    for (int a = 1; a <= num1; a++) // Loop to calculate the factorial
    {
        factorial = factorial * a; // Calculating factorial by multiplying 'factorial' with 'a'
    }

	cout << " The factorial of the given number is: " << factorial << endl; // Displaying the factorial of the entered number
    return 0; // Indicating successful completion of the program
}

Sample Output:

 Find the factorial of a number:                                       
------------------------------------                                   
 Input a number to find the factorial: 5                               
 The factorial of the given number is: 120

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to calculate the factorial of a number using both recursion and iteration.
Write a C++ program that computes the factorial of an input number and outputs the multiplication sequence.
Write a C++ program to find the factorial of a number using a while loop and display the result.
Write a C++ program to compute the factorial of a number and check for overflow for large inputs.

C++ Code Editor:

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