C++ Exercises: Read an integer n and prints the factorial of n

Last update on April 05 2025 13:31:17 (UTC/GMT +8 hours)

Factorial of n

For n = 10, write a C++ program that reads the integer n and prints its factorial.

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Sample Solution:

C++ Code :

#include <iostream> // Including input-output stream header file
using namespace std; // Using the standard namespace

// Function to calculate factorial recursively
long long factorial(int num) {
    if (num == 0) { // If the number is 0
        return 1; // Return 1 because 0! is 1 by definition
    }
    else {
        // Recursive call to calculate factorial
        // Multiplies the number with the factorial of (number - 1)
        return num * factorial(num - 1);
    }
}

int main() {
    int num; // Declare variable to store the input number

    cin >> num; // Take input from the user

    // Displaying the factorial of the input number using the factorial function
    cout << factorial(num) << endl;

    return 0; // Indicating successful completion of the program
}

Sample Output:

sample Output
1

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to calculate the factorial of n using both recursion and iteration, then compare the results.
• Write a C++ program to compute the factorial of n while checking for integer overflow with large values.
• Write a C++ program that calculates n! using a loop and prints the multiplication sequence leading to the final result.
• Write a C++ program to compute the factorial of n using tail recursion and then display the number of digits in the result.

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