Factorial Program in C++.

In this section you will learn how to find a factorial of given number. In mathematic term factorial of non-negative integer, is multiplication of all integers.

Example of factorial number.

Formula:- n! = n ^x (n - 1) ^x (n - 2) ^x .... ^x 1

5! = 5 x 4 x 3 x 2 x 1 = 120.

4! = 4 x 3 x 2 x 1 = 24.

How program will work?

• First initialize three integer variable like (n, i, fact).
• Assign the default value to fact variable like fact=0.
• Now perform multiplication operation with arithmetic operator (*).
• Finally show the result on output screen.

Program of factorial number in c++.

	#include<iostream.h>
	#include<conio.h>
		
	//FACTORIAL PROGRAM
	void main()
	{
		int n,i,fact=1;
		clrscr();
		cout<<"ENTER A NUMBER:- ";
		cin>>n;

		for(i=1; i<=n; i++)
		{
			fact=fact*i;
		}
			
		cout<<"FACTORIAL OF "<<n<<" IS:- "<<fact;
		getch();
	}
	

Output:

	ENTER FIRST NUMBER:- 5
	FACTORIAL OF 5 IS:- 120