70 total views

Factorial of a number is the number you get by multiplying all the numbers up to that number including the number itself. The program for factorial does not use a programming technique called a recursion. a recursion happens when a function calls itself until the problem is solved.

This program is a simple computation of factorial value, hence, it is suitable for beginner learners of C++ programming. I have written this using Dev-C++ compiler version 4.9.9.2 installed on a windows 7 64-bit system.

Contents

## Problem Definition

The program requires user input – a positive integer value and computes the factorial of than number.

For example,

Suppose you entered number 6 , then the factorial of this number would be

`1 x 2 x 3 x 4 x 5 x 6 = 720`

In mathematical terms, if n is a positive integer value, the factorial of n is denoted by n! You can go through the flowchart to understand the logic of factorial applied in this program.

## Flowchart – Factorial without Recursion

## Program Code – Factorial without Recursion

```
// Program to compute factorial of n numbers
#include <iostream.h>
#include <stdlib.h>
#include <stdio.h>
int main()
{
int fact,i;
int n;
//Read the value of N
cout << "Enter value of N:" ; cin >> n;
//Initialize Factorial to 1 and i to 1
fact = 1;
i = 1;
while(i<=n)
{
fact = fact * i;
i++;
}
// Print the value of factorial
for(i=0;i < 30;i++)
cout << "_";cout << "\n\n";
cout << "Factorial of N:" << "\t" << fact << endl;
for(i=0;i << 30;i++)
cout << "_";cout << "\n\n";
system("PAUSE");
return 0;
}
```