C++ Program to find Factorial of a Number

February 8, 2021 9:55 am IST

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What is Factorial of a Number?

The factorial of a number n can be defined as the product of all positive numbers less than or equal to n. For example, the factorial of 6 is 1 × 2 × 3 × 4 × 5 × 6 = 720.

Examples

The following table provides few examples of factorial of a number.

Number	Factorial	Result
1!	1	1
2!	1 × 2	2
3!	1 × 2 × 3	6
4!	1 × 2 × 3 × 4	24

Note: In Mathematics, factorial of a number is represented by exclamation mark.

Tips: It is recommended to use our online Factorial of a Number calculator for better understanding.

Find a Factorial of a Number

In the following example, we will find a factorial of a number 6.

Example

C++ Compiler

#include <iostream> using namespace std; int main() { int num = 6; int i = 1; int factorial = 1; for(i=1; i<=num; i++) factorial *= i; if(num > 0) cout << "Factorial of " << num <<": " << factorial; else cout << "Factorial of 0: 0\n"; return 0; }

Output

Factorial of 6: 720

Find a Factorial of any Given Number

In the following example, we will find a factorial of any given number.

Example

C++ Compiler

#include <iostream> using namespace std; int main() { int num; int i = 1; int factorial = 1; cout << "Enter a (int) number: "; cin >> num; for(i=1; i<=num; i++) factorial *= i; if(num > 0) cout << "Factorial of " << num <<": " << factorial; else cout << "Factorial of 0: 0\n"; return 0; }