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Absolute Recursive factorial function C++

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Submitted on: 9/3/2000 5:33:56 AM
By: Arjang  
Level: Intermediate
User Rating: By 6 Users
Compatibility: C++ (general)
Views: 50310
 
     C++ VERSION OF Recursive factorial function It will get a number and gives you it's factorial using a Recursive function ( a function that calls itself)
 

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//**************************************
//INCLUDE files for :Absolute Recursive factorial function C++
//**************************************
<iostream>
using namespace std;
code:
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//**************************************
// Name: Absolute Recursive factorial function C++
// Description:C++ VERSION OF Recursive factorial function It will get a number and gives you it's factorial using a Recursive function ( a function that calls itself)
// By: Arjang
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=753&lngWId=3//for details.//**************************************

/* Recursive factorial function programmed by Arjang
For more info email me arjang7@hotmail.com
a recursive function is a function that will call itself
it is probably the most difficult type of function designing
but when you get use to it, you'll find it VERY USEFULL 
the c version of this function is also available right here.
*/
//inserting header file
#include<iostream>
using namespace std;
//declaring function
int factorial(int);
void main(void)
{
int number, result;
cout<<"Please Enter A number to get it's factorial: ";
//getting our target number
cin>>number;
//calling the function
result = factorial(number + 1);
//printing out results
cout<<endl<<"The factorial is : "<< result;
cout<<endl<<endl<<endl<<endl<<endl;
}
int factorial(int victim)
{
if(victim>1)
{
victim = victim - 1;
/*this is the whole point where you actually call the same function which you are into, it is called a recursive function. */
victim = victim * factorial(victim);
}
return victim;
}


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Other User Comments

10/23/2000 4:47:23 PMjtaitt

Thoughtless interface design.
Users shouldn't have to remember to add one to their input for a factorial function.

You could find better implementations for this in any alogorithm book.

Here's a revision to program.

/* factorial.c */
#include

unsigned factorial(unsigned N)
{
if( N > 1 )
{
N *= factorial(N - 1);
}

return (N);
}

void main(void)
{
unsigned N = 5;

fprintf(stdout,"%d factorial is %d",N,factorial(N) );

}
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4/10/2001 10:54:01 AMSharif Ibrahim

A function of this form can result in a slight speed savings (recursive functions can use all the help they can get)
unsigned factorial(unsigned N)
{
return (N <= 1) ? 1 : N*factorial(N-1);
}
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6/24/2001 12:27:51 PMUmaer Khalil

The program is quite common and used in a lot of C++ books for begginers.Also the same objective (n!) can be achieved by a smaller programme.Still it is quite a useful example.

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