Parses a number in the specified radix. - CSharp System

CSharp examples for System:Int32

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Description

Parses a number in the specified radix.

Demo Code

/*/*from w  w  w . j ava 2 s.co m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
using System;

public class Main{
        /// <summary>
        /// Parses a number in the specified radix.
        /// </summary>
        /// <param name="s">An input System.String.</param>
        /// <param name="radix">A radix.</param>
        /// <returns>The parsed number in the specified radix.</returns>
        public static long Parse(System.String s, int radix)
        {
            if (s == null) 
            {
                throw new ArgumentException("null");
            }

            if (radix < MIN_RADIX) 
            {
                throw new NotSupportedException("radix " + radix +
                    " less than Number.MIN_RADIX");
            }
            if (radix > MAX_RADIX) 
            {
                throw new NotSupportedException("radix " + radix +
                    " greater than Number.MAX_RADIX");
            }

            long result = 0;
            long mult = 1;

            s = s.ToLower();
         
            for (int i = s.Length - 1; i >= 0; i--)
            {
                int weight = digits.IndexOf(s[i]);
                if (weight == -1)
                    throw new FormatException("Invalid number for the specified radix");

                result += (weight * mult);
                mult *= radix;
            }

            return result;
        }
}

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