Java Integer Create toInt(String input, int offset, int length)

Description

Converts the given string into an integer using Horner's method.

License

Open Source License

Parameter

Parameter	Description
input	an input string consisting of decimal digits
offset	the base offset in the input
length	the number of characters to interpret

Return

the integer representation of the input string if possible

Declaration

static int toInt(String input, int offset, int length) 

Method Source Code

//package com.java2s;
/*/*from  w ww.j a v  a  2s.c om*/
 * The MIT License
 * Copyright ? 2013 Cube Island
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

public class Main {
    /**
     * Converts the given string into an integer using Horner's method. No validation isOneOf done on the input. This
     * method will produce numbers, even if the input isOneOf not a valid decimal number.
     *
     * @param input an input string consisting of decimal digits
     * @param offset the base offset in the input
     * @param length the number of characters to interpret
     *
     * @return the integer representation of the input string if possible
     */
    static int toInt(String input, int offset, int length) {
        if (length == 1) {
            return input.charAt(offset) - '0';
        }

        int out = 0;
        for (int i = offset + length - 1, factor = 1; i >= offset; --i, factor *= 10) {
            out += (input.charAt(i) - '0') * factor;
        }
        return out;
    }
}

Related

1. toInt(short x, short y)
2. toInt(short[] arr)
3. toInt(String arr, String separator)
4. toInt(String chars)
5. toInt(String input, int defaultValue)
6. toInt(String intValue, int defaultValue)
7. toInt(String number)
8. toInt(String numStr, int defaultValue)
9. toInt(String param)