关于书上90页的练习题（请教,有2个问题都在里面的注释）

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

namespace 习题6_11
{
class class1
{
      static void Main(string[] args)
      {
         Console.WriteLine("(2) if语句练习：");
         IfStatement(-2);
         Console.WriteLine("(3) switch语句练习：");
         SwitchStatement(-3);
         Console.WriteLine("(4) for语句练习：");
         ForStatement(5);
         Console.WriteLine("(5) foreach语句练习：");
         ForeachStatement(  );                      //这里怎么传数组进去呢？格式是怎样的？
         Console.WriteLine("(6) while语句练习：");
         WhileStatement(0);
         Console.WriteLine("(7) do while语句练习：");
         DoStatement(0);
         Console.WriteLine("(8) try语句练习：");
         TryStatement(3);

         Console.Read();
      }

      static void IfStatement(int a)
      {
         if (a > 0)
         {
            Console.WriteLine("正数");
         }
         else
         {
            Console.WriteLine("非正数");
         }
      }

      static void SwitchStatement(int b)
      {
         switch (b)
         {
            case 1:
                  Console.WriteLine("case为1"); break;
            case 2:
                  Console.WriteLine("case为2"); break;
            case 3:
                  Console.WriteLine("case为3"); break;
            default:
                  Console.WriteLine("除1,2,3已外的数"); break;
         }
      }

      static void ForStatement(int c)
      {
         int sum = 0;
         for(c = 0;c <= 100;c++)
         {
            sum = c + sum;
         }
         Console.WriteLine(sum.ToString());
      }

      static void ForeachStatement(int[] d)
      {
         int sum = 0;
         foreach (int i in d)
         {
            sum = sum + i;
         }
         Console.WriteLine(sum.ToString());
      }

      static void WhileStatement(int e)
      {
         int sum = 0;
         while (e <= 100)
         {
            sum = e + sum;
            e++;
         }
         Console.WriteLine(sum.ToString());
      }

      static void DoStatement(int f)
      {
         int sum = 0;
         do
         {
            sum = f + sum;
            f++;
         } while (f <= 100);
         Console.WriteLine(sum.ToString());
      }

      static void TryStatement(int g)
      {
         int k = 0;
         try
         {
            int sum = g / k;
         }
         catch
         {
            Console.WriteLine("被除数不能为0");
         }
         finally
         {
            Console.WriteLine("计算结果为：" + sum.ToString());             //为什么这里用sum会出错呢？要怎么改才能用到sum呢？
         }
      }

      }
}

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在这个辽阔的世界面前，可笑的梦想将成为你们前进的方向。

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