C#中while循环和do-while循环举例详解

while(条件表达式)
{
    条件表达式成立(true)时要执行的语句;
}

do {
//程序语句;
}while(条件运算);

int counter=1，sum=0://counter是计数器
do {
    sum += counter;//sum 存储数值累加的结果
    counter++;//控制运算:让计数器累加
}while(counter<= 10);//条件表达式

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

//User defined
using static System.Console;//导入静态类

namespace while_dowhile
{
    class Program
    {

        static void Main(string[] args)
        {
            //while循环
            int sum = 0;
            int counter = 1;//计数器
            while (counter <= 10)
            {
                sum += 1;
                counter++;//将计数累加
            }
            Console.WriteLine("累加结果:{0}", sum);

            //dowhile循环
            int counter2 = 1,sum2 = 0;//counter是计数器
            do {
                sum2 += 1;//sum存储数值累加的结果
                counter2++;//控制运算:让计数器累加
            } while (counter2 <= 10);//条件表达式
            Console.WriteLine("累加结果:{0}", sum2);

            //while循环 + break中断+continue
            int sum3 = 0;
            int num1 = 0;
            int counter3 = 1;//计数器
            while (counter3 <= 10)
            {
                sum3 += 1;
                counter3++;//将计数累加
                if (counter3 % 2 == 0)//找出奇数
                {
                    num1 += 1;
                    WriteLine("执行continue");
                    continue;//继续循环
                }


                if (sum3>7)
                {
                    WriteLine("sum3>7，中断");
                    break;
                }
            }
            Console.WriteLine("累加结果:{0}", sum3);
            Console.WriteLine("执行continue{0}", num1);

            ReadKey();
        }
    }
}

            //while循环 + break中断+continue
            int sum3 = 0;
            int num1 = 0;
            int counter3 = 1;//计数器
            while (counter3 <= 10)
            {
                sum3 += 1;
                counter3++;//将计数累加
                if (counter3 % 2 == 0)//找出奇数
                {
                    num1 += 1;
                    WriteLine("执行continue");
                    continue;//继续循环
                }


                if (sum3>7)
                {
                    WriteLine("sum3>7，中断");
                    break;
                }
            }
            Console.WriteLine("累加结果:{0}", sum3);
            Console.WriteLine("执行continue{0}", num1);