黑马程序员（C#4）之《几种求1-100之和的方法》

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方法一：while语句

using System;

    publicclass Sum100

    {

        publicstatic void Main()

        {

            intSum, i;

            Sum = 0; i = 1;

            while(i <= 100)

            {

                Sum += i;

                i++;

            }

            Console.WriteLine("Sum is " + Sum);

            Console.Read();

        }

    }

方法二：do—while语句

using System;

    publicclass Sum100

    {

        publicstatic void Main()

        {

           intSum ,  i ;

           Sum=0;  i=1;

           do

           {

               Sum += i;

               i++;

           } while (i <= 100);

           

            Console.WriteLine("Sum is " + Sum);

            Console.ReadLine();

       }

    }

方法三：for语句

using System;

    publicclass Sum100

    {

        publicstatic void Main()

        {

            intSum, i;

            Sum = 0;

            for(i = 1; i <= 100; i++)

                Sum += i;

            Console.WriteLine("Sum is " + Sum);

            Sum = 0;

            for(i = 100; i > 0; i--)         // i也可以每次减1

                Sum += i;

            Console.WriteLine("Sum is " + Sum);

            Console.ReadLine();

        }

    }

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