用c#求：输入两个正整数a和n，求a+aa+aaa+…+aa…a（n个a）之和。例如输入2和3，输出246（2+22+222）。

我做的结果出现了很多错误，求方法.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _9
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("请输入a的值：");
            string input = Console.ReadLine();
            int n = int.Parse(input);
            Console.Write("请输入n的值：");
            string input = Console.ReadLine();
            int n = int.Parse(input);
            int i = 0;
            int a = 0;
            int sum = 0;
            for (i = 1; i < n + 1; i++)
                sum = sum + i;
            i = i * 10 + a;
            Console.WriteLine("{0}+{1}={2}\t", a, i, i + a);

        }
    }
}

static void Main(string[] args)
        {
            int i = 0;
            int a = 0;
            int n = 0;
            Console.Write("请输入a的值：");
            string input = Console.ReadLine();
            a = int.Parse(input);
            Console.Write("请输入n的值：");
            input = Console.ReadLine();
            n = int.Parse(input);
            
            int sum = 0;
            int temp = 0;
            string str = "";
            for (i = 0; i < n; i++)
            {
                temp = temp * 10 + a;
                sum = sum + temp;
                str += temp + "+";
            }
            if (str.Length > 1)
            {
                str = str.Substring(0, str.Length - 1);
            }
            Console.WriteLine(str + "=" + sum);
            Console.ReadKey();
        }

收到的鲜花

• Lyz贞贞 于 2013-04-14 23:21 送鲜花  2朵   附言：太感谢你了，我觉得你的方法很好！对于新手 ...

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

namespace eg4
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, n,b,sum=0;
            Console.WriteLine("输入两个数 ");
            a = int.Parse(Console.ReadLine());
            n = int.Parse(Console.ReadLine());
            b = a;
            for (int i = 0; i < n; i++)
            {
                sum += b;
                b = b * 10 + a;
            }
            Console.Write("sum={0}",sum);
            Console.ReadKey();
        }
    }
}
记得给分……

收到的鲜花

• Lyz贞贞 于 2013-04-14 23:26 送鲜花  1朵   附言：谢谢你，答案是对的，但是后面有些欠佳，没 ...

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

namespace _99
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, n, i, b = 0, sum = 0;
            Console.WriteLine("请输入a的值：");
            a = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入n的值：");
            n = int.Parse(Console.ReadLine());
            for (i = 0; i < n-1; i++)
            {

                b = b * 10 + a;
                Console.Write("{0}+", b);
                sum += b;
            }
            b = b * 10 + a;
            Console.Write("{0}", b);
            sum += b;
            Console.Write("={0}", sum);
            Console.ReadLine();
        }
    }
}

我刚入门,用的是比较笨的方法......
不过上面这个我调试了，是对的。

收到的鲜花

• Lyz贞贞 于 2013-04-14 23:24 送鲜花  3朵   附言：太感谢你了，我觉得你的方法很好！和我的方 ...

太感谢你了，我觉得你的方法很好！对于新手的我来说，后面的部分，那个方法没有学过，不太懂！

Console.WriteLine("计算a+aa+aaa+...+aaa...aaa(n个a)的值\n");
            Console.Write("请输入a的值:");
            string input = Console.ReadLine();
            int a = Int32.Parse(input);
            Console.Write("请输入n的值:");
            string numstr = Console.ReadLine();
            int number = Int32.Parse(numstr);
            string tempstr = null;
            int tempValue = 0;
            int result = 0;
            for (int j = 0; j < number; j++)
            {
                for (int i = 0; i <j+1; i++)
                    tempstr += "1";               
                tempValue += Int32.Parse(tempstr);
                tempstr =null;
            }
            result = a * tempValue;
            Console.Write(result);
            Console.ReadKey();