大数运算(任意两大数相加)

我们的计算器一般计算范围最多都要十几位到二十几位，如果要计算一个很大的数那么用计算器就不管用了吧，为了能计算两个大数相加，就根据加法的原理来写一个算法吧。

原理：两数相加，从个位开始相加，满10进1。

实现：

创建控制台应用程序，代码如下：

using System;
using System.Collections.Generic;
using System.Text;

namespace BigNum {
    class Program {
        static string a, b, c, lastStr; static int tempX; static int[ ] x; static int[ ] y;
        static void Main ( string[ ] args ) {
            c = ( a = "0" + Console.ReadLine ( ) ) + ( b = "0" + Console.ReadLine ( ) );
            c = ( a.Length >= b.Length ) ? ( b = ( b.PadLeft ( a.Length ).Replace ( " ", "0" ) ) ) : ( a = ( a.PadLeft ( b.Length ).Replace ( " ", "0" ) ) );
            int[ ] temp = new int[a.Length];
            x = Array.ConvertAll ( a.ToCharArray ( ), new Converter<char, int> ( ToType ) );
            y = Array.ConvertAll ( b.ToCharArray ( ), new Converter<char, int> ( ToType ) );
            for ( int i = b.Length - 1; i > -1; i-- ) {
                tempX = ( ( x[i] + y[i] ) >= 10 ) ? ( ( x[i - 1]++ ) & ( temp[i] = x[i] + y[i] - 10 ) ) : ( temp[i] = x[i] + y[i] ); }
            foreach ( int s in temp ) { lastStr += s.ToString ( ); }
            while ( lastStr[0].ToString ( ) == "0"&& lastStr .Length >1 ) { lastStr = lastStr.Remove ( 0, 1 ); }
            Console.WriteLine ( lastStr ); Console.ReadKey ( );}
        public static int ToType ( char xx ) { return int.Parse ( xx.ToString ( ) );}
    }
}