factorial.c File Reference

Detailed Description

Provides functions to compute the factorial of a number.

Copyright

• (c) 2002 The University of Chicago, as Operator of Argonne National Laboratory.
• (c) 2002 The Regents of the University of California, as Operator of Los Alamos National Laboratory.

License

This file is distributed under the terms of the Software License Agreement found in the file LICENSE included with this distribution.

Author

M. Borland, C. Saunders, R. Soliday

Definition in file factorial.c.

#include "mdb.h"

Go to the source code of this file.

Functions
long	factorial (long n)
	Computes the factorial of a given number.
double	dfactorial (long n)
	Computes the factorial of a given number as a double.

Function Documentation

dfactorial()

double dfactorial

(

long

n

)

Computes the factorial of a given number as a double.

This function calculates the product of all positive integers up to n and returns the result as a double.

Parameters

n	The number for which the factorial is to be computed.

Returns

The factorial of n as a double.

Definition at line 43 of file factorial.c.

                          {
  register double prod = 1;
 
  while (n > 0)
    prod *= n--;
 
  return (prod);
}

factorial()

long factorial

(

long

n

)

Computes the factorial of a given number.

This function calculates the product of all positive integers up to n.

Parameters

n	The number for which the factorial is to be computed.

Returns

The factorial of n as a long integer.

Definition at line 26 of file factorial.c.

                       {
  register long prod = 1;
 
  while (n > 0)
    prod *= n--;
 
  return (prod);
}