Java Factorial factorial(int value)

Description

factorial

License

Apache License

Parameter

Parameter	Description
value	some value between 0 and 12. 13! is larger than MAX_INTEGER

Return

the factorial of the given number

Declaration

public static int factorial(int value) 

Method Source Code

//package com.java2s;
/*/*from   w w  w  .  jav a  2s.co m*/
 *    Copyright 2016 Roche NimbleGen Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

public class Main {
    /**
     * @param value
     *            some value between 0 and 12. 13! is larger than MAX_INTEGER
     * @return the factorial of the given number
     */
    public static int factorial(int value) {
        if (value > 12) {
            throw new IllegalStateException("The value[" + value
                    + "] is greater than 12 and anything equal to or larger than 13! is too large to be returned as an int.");
        } else if (value < 0) {
            throw new IllegalStateException(
                    "The value[" + value + "] is less than 0, so factorial cannot be computed.");
        }
        int result = 1;
        for (int i = 2; i <= value; i++) {
            result *= i;
        }
        return result;
    }

    /**
     * @param value
     *            some value between 0 and 199. 200! is larger than MAX_LONG
     * @return the factorial of the given number
     */
    public static long factorial(long value) {
        if (value > 199) {
            throw new IllegalStateException("The value[" + value
                    + "] is greater than 199 and anything equal to or larger than 200! is too large to be returned as an long.");
        } else if (value < 0) {
            throw new IllegalStateException(
                    "The value[" + value + "] is less than 0, so factorial cannot be computed.");
        }
        long result = 1;
        for (long i = 2; i <= value; i++) {
            result *= i;
        }
        return result;
    }
}

Related

1. factorial(int n)
2. factorial(int n)
3. factorial(int n)
4. factorial(int n)
5. factorial(int number)
6. factorial(int x)
7. Factorial(int x)
8. factorial(int x)
9. factorial(long l)