Factorial program using the pointer in C++ language

Factorial program  using the pointer in C++ language

In this tutorial, we will discuss the concept of Factorial program  using the pointer in C++ language

In this post, we will learn how to calculate factorial of a number using the pointer in C++ language and go through the given C++ example to calculate the factorial of a positive integer

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

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

Program 1

The program allows the user to enter a number (a positive integer) and then it calculates factorial of given number using pointer variable in C ++ programming language

//Factorial program using the pointer in C++ language
#include <iostream>
#include <conio.h>
using namespace std;

void findFactorial(int, int *);//Function prototype
int main()
{
    int i,fact,num;//variable declaration
    cout<<"Enter a number: \n";
    cin>>num;//Takes input from the user
    findFactorial(num, &fact);//function call
    cout<<"Factorial of " <<num<< " is: "<<fact;
    //display the factorial of given number
    getch();
    return 0;
}

//function definition with parameter
void findFactorial(int num, int *fact){
int i;

*fact=1;

for(i=1; i<=num; i++){//calculate factorial using for loop
*fact=*fact*i;
}
}

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

Enter a number
5
Factorial of 5 is: 120

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