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# Factorial of a number in C++

In this tutorial we are going to see how to find a factorial of number using C++ program

Firstly let’s see a example to understand it better

n! = n + (n-1) + (n-2) ! n>=1

3! = 3 *2*1 = 6

Program to find factorial of a number

using loop

• #include <iostream>

• using namespace std;

• int main()

• {

• int i,fact=1,number;

• cout<<"Enter any Number: ";

• cin>>number;

• for(i=1;i<=number;i++){

• fact=fact*i;

• }

• cout<<"Factorial of " <<number<<" is: "<<fact<<endl;

• return 0;

• }

Output –

Enter any Number: 3

Factorial of 3 is: 6

using recursion

• #include<iostream>

• using namespace std;

• int main()

• {

• int factorial(int);

• int fact,value;

• cout<<"Enter any number: ";

• cin>>value;

• fact=factorial(value);

• cout<<"Factorial of a number is: "<<fact<<endl;

• return 0;

• }

• int factorial(int n)

• {

• if(n<0)

• return(-1); /*Wrong value*/

• if(n==0)

• return(1); /*Terminating condition*/

• else

• {

• return(n*factorial(n-1));

• }

• }

Output –

Enter any number: 6

Factorial of a number is: 720

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