Cpp program to find factorial of a number

Cpp program to find factorial of a number

In this tutorial, we will discuss the concept of Cpp program to find factorial of a number

Factorial is a product of all positive descending integer begins with a specified number (n) and calculates upto one

There are many ways to calculate factorial using C++ language. some of them are described as below.

Example

factorial of 5 is

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

 

factorial of 4 is

4!=4*3*2*1=24

 

factorial of n is

n!=n*(n-1)*....2*1

Cpp program to find factorial

Find factorial of a number using for loop

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num,factorial=1;
    cout<<"Enter number for find factorial: ";
    cin>>num;
    for(int i=1; i<=num; i++){
        factorial*=i;  //factorial=factorial*i
    }
    cout << "factorial of "<<num<<" is: "<<factorial<< endl;
    getch();
    return 0;
}

When the above code is compiled and executed, it produces the following results

Enter number for find factorial: 6
Factorial of 6 is:720

This program intakes input (a positive integer) from the user and calculates the factorial of the given number using For loop and displays the result.

 

Find factorial  of a number using while loop

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num,factorial=1;
    cout<<"Enter number for find factorial: ";
    cin>>num;
    int i=1;
   while(i<=num){
        factorial*=i;  //factorial=factorial*i
         i++;
    }
    cout << "factorial of "<<num<<" is: "<<factorial<< endl;
    getch();
    return 0;
}

When the above code is compiled and executed, it produces the following results

Enter number for find factorial: 7
Factorial of 6 is:5040

This program intakes input (a positive integer) from the user and calculates the factorial of the given number using while loop and displays the result.

Find factorial of a number using the do-while loop

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num,factorial=1;
    cout<<"Enter number for find factorial: ";
    cin>>num;
    int i=1;
    do{
        factorial*=i;  //factorial=factorial*i
         i++;
    }
   while(i<=num);
    cout << "factorial of "<<num<<" is: "<<factorial<< endl;
    getch();
    return 0;
}

When the above code is compiled and executed, it produces the following results

Enter number for find factorial:8
factorial of 8 is: 40320

This program intakes input (a positive integer) from the user and calculates the factorial of the given number using Do-while loop and displays the result.

Find factorial of a number using C++ recursion

#include <iostream>
#include <conio.h>
using namespace std;
int factorial(int n);
int main()
{
    int num;
    cout<<"Enter number for find factorial: ";
    cin>>num;
    cout << "factorial of "<<num<<" is: "<<factorial(num)<< endl;
    getch();
    return 0;
}
int factorial(int n)
{
    if(n>1)
        return n*factorial(n-1);
        else
          return 1;
}

When the above code is compiled and executed, it produces the following results

Enter number for find factorial: 6
factorial of 6:720

This program intakes  input (positive integer) from the user and calculates the factorial of the given number using

recursion and displays the result.

 

Suggested for you

C++ Operator

C++ if statements

C++ for loop

C++ while loop

C++ do-while loop

 

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