C++ Program to Print Factorial of a Number

Write a C++ Program to print factorial of a number. How to print factorial of a number using C++ code.

Given an input number, we have to write a code to calculate a factorial of a number.

What is Factorial?

Factorial of a non-negative number n, is the product of all integers less than or equal to n.

For example - Factorial of 5 is 120.

5! = 5 * 4 * 3 * 2 * 1 = 120

C Program to Print Factorial of a Number

Java Program to Print Factorial of a Number

C++ Program to Print Factorial of a Number

#include<iostream.h>

int main() {

  int num, fact=1;  

  cout << "Enter a number: "; 
  cin  >> num;

  //If number is greater than zero

  if(num > 0) {

    for(int i=1; i <= num; i++){
       fact = fact*i;                  
    }

   cout << "Factorial of a number is: "<< fact;
 
  } else if (num == 0 ){

    cout << "Factorial of 0 is 1";

  } else {

   cout << " Factorial of a negative number doesn't exist";

  } 

  return 0; 

}

C++ Program to Print Factorial of a Number using Function

#include <iostream>

using namespace std;

int factorial(int num) {

     int fact = 1;
 
     //Factorial of a zero is zero
     if (num == 0) {
       return 1;
     } 
 
     for (int i = 1; i <= num; i++) {
       fact = fact*i;
     }
 
    return fact;
}

int main(void) {

    int num;
 
    cout << "Enter a number \n";
    cin  >> num;
 
    if (num >=  0) {
       //Function is called factorial(num)
       cout << "Factorial of a number is " << factorial(num);
  
    } else {
      cout << "Factorial of a negative number doesn't exist";
    }
  
    return 0;
}

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