Factorial Program in C++

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Factorial of a Number in C++

Factorial of any number is the product of an integer and all the integers below it for example factorial of 4 is
4! = 4 * 3 * 2 * 1 = 24

factorial program in c++

Factorial program in C++ using for Loop

Factorial Program in C++

#include<iostream.h>
#include<conio.h>

void main()
{
int i, no, fact=1;
clrscr();
cout<<"Enter the any no. : ";
cin>>no;
for(i=1;i<=no;i++)
{
fact=fact*i;
}
cout<<"Factorial: "<<fact;
getch();
}

Output

Enter the any no. : 4
Factorial: 24

Factorial program using do-while loop

Example

#include<iostream.h>
#include<conio.h>

 void main()
  {
   long n, i, fact=1;
   clrscr();
   cout<<"Enter any num: ";
   cin>>n;
   i=n;
   if(n>=0)
    {
   do
    {
    fact=fact*i;
    i--;
    }
   while(i>0);
   cout<<"\nFactorial: "<<fact;
   }
   else
    {
   cout<<"fact of -ve num. is not possible";
    }
   getch();
  }

Output

Enter any num : 5
Factorial: 120

Factorial program using recursion in C++

The process in which a function calls itself directly or indirectly is called recursion and the corresponding function is called as recursive function.

factorial of a number using recursion

Example

#include<iostream.h>
#include<conio.h>

void main()
{
int fact(int);
int f, n;
clrscr();
cout<<"Enter any num: ";
cin>>n;
f=fact(n);
cout<<"\nFactorial : "<<f;
getch();
}
int fact(int a)
{
if(a==1)
return(1);
else
{
return(a*fact(a-1));
}
}

Output

Enter any num: 6
Factorial: 720

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