C#-基本结构

一、IF结构

if(chinese==100 && music>70)
            {
               Console.WriteLine("优秀"); 
            }
            Console.ReadKey();

 if (score >= 90)
            {
                str="A";      //Console.WriteLine("A");  
            }
            else if (score >= 80)
            {
                str = "B";    //Console.WriteLine("B");
            }
            else if (score >= 70)
            {
                str = "C";   //Console.WriteLine("C");
            }
            else if (score >= 60)
            {
                str = "D";    //Console.WriteLine("D");8
            }
            else
            {
                str = "E";    //Console.WriteLine("E");
            }
            Console.WriteLine(str);

二.For循环

 for (int j = 1; j <=9; j++)
            {
                for (int i = 1; i <=9; i++)
                {
                    Console.Write("{0}*{1}={2}\t", i, j, i * j);
                }
                Console.WriteLine();
            }

三.While循环

<1>

 while (student <= 200000)//到多少年达到20万人
            {
                student *= 1.25; //每年增长25%
                year++;
            }

     do
       {
            Console.WriteLine("请输入账号");
            name = Console.ReadLine();
            Console.WriteLine("请输入密码");
            pwd = Console.ReadLine();
        } while (name != "admin" || pwd != "88888");

<2>Break（）

用于循环，中止循环

<3>continue()

跳转，具体跳转的代码根据实际情况而定