【C#】【平时作业】习题-2-数据类型运算符表达式

目录

1、请设计程序，验证算数运算符和赋值运算符。

Int a，b，c

C=a+b

+=

  privatevoid button1_Click(object sender, EventArgse)
{
        tb.Text = "";
        tb.Text = tb.Text +Environment.NewLine  + "【题1】" +Environment.NewLine + Environment.NewLine + "1、请设计程序，验证算数运算符和赋值运算符。" + Environment.NewLine + " int a,b,c "+ Environment.NewLine + " c=a+b "+ Environment.NewLine + " 使用 += 验证";
	tb.Text = tb.Text +Environment.NewLine + Environment.NewLine + "【解答】 "+ Environment.NewLine + Environment.NewLine + "int a=1, b=2, c=0; ";
	int a = 1, b = 2, c =0;
	c = a + b;
	tb.Text = tb.Text + Environment.NewLine + "c=a+b,c的结果为： "+c.ToString();
        a = 1; b = 2; c = 0;
        a +=b;
        tb.Text = tb.Text +Environment.NewLine + "a+=b,a的结果为： " + a.ToString();
        a = 1; b = 2; c = 0;
        b += a;
	tb.Text = tb.Text +Environment.NewLine + "b+=a,b的结果为： " + b.ToString();
     	tb.Text = tb.Text +Environment.NewLine + Environment.NewLine + "----------萌狼蓝天解答完毕----------- ";
}

2、请设计程序，验证关系运算符和逻辑运算符。

Bool r；

Int a=6,b=7;

R=a>b;

Bool f=true;

Bool g=false;

R=f&&g

privatevoid button2_Click(object sender, EventArgs e)
{
            tb.Text = "";
            tb.Text = tb.Text +Environment.NewLine + "【题2】" + Environment.NewLine + Environment.NewLine + "2、请设计程序，验证关系运算符和逻辑运算符。" + Environment.NewLine + "" +
             "bool r;"+ Environment.NewLine +
             "int a = 6, b = 7;" + Environment.NewLine +
             " r = a > b;" + Environment.NewLine +
             "bool f = true;" + Environment.NewLine +
             "bool g = false;" + Environment.NewLine +
             Environment.NewLine + " 使用 R = f && g 验证";
            tb.Text = tb.Text +Environment.NewLine + Environment.NewLine + "【解答】 " + Environment.NewLine;
            bool r;
            int a = 6, b = 7;
            r = a > b;
            bool f = true;
            bool g = false;
            tb.Text = tb.Text +Environment.NewLine + "r=a>b ,结果为： " + (r=a>b).ToString();
            tb.Text = tb.Text +Environment.NewLine + "r=f&&g,运算的结果为： " + (r = f && g).ToString();
            tb.Text = tb.Text + Environment.NewLine + Environment.NewLine + "----------萌狼蓝天解答完毕----------- ";

}

3、什么是短路运算，请举例说明？

  privatevoid button3_Click(object sender, EventArgse)
{
            tb.Text = "";
            tb.Text = tb.Text +Environment.NewLine + "【题3】" + Environment.NewLine + Environment.NewLine + "3、什么是短路运算，请举例说明" + Environment.NewLine + "" +
            "短路运算符，当第一个条件起到决定作用的时候，不再执行后面的条件，例如：" +Environment.NewLine +
            "if(a && b) 中 如果a为false，则结果一定为false,则后面的b无需再进行判断" + Environment.NewLine +
            "if(a || b) 中 如果a为true，则结果一定为true,则后面的b无需再进行判断" + Environment.NewLine;
}

4、项目实训题，要求如图：

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            //实训题目：
            //从键盘输入学生姓名及其5门课的成绩（语文，数学，英语，物理，化学）的总成绩及其平均分
            Console.Write("请输入学生姓名：");
            String name = Console.ReadLine();
            Console.Write("请输入语文成绩：");
            String chinese = Console.ReadLine();
            int a = changeInt(chinese);
            Console.Write("请输入数学成绩：");
            String math = Console.ReadLine();
            int b = changeInt(math);
            Console.Write("请输入英语成绩：");
            String english = Console.ReadLine();
            int c = changeInt(english);
            Console.Write("请输入物理成绩：");
            String physics = Console.ReadLine();
            int d = changeInt(physics);
            Console.Write("请输入化学成绩：");
            String chemistry= Console.ReadLine();
            int e = changeInt(chemistry);
            //计算
            int sum = a + b + c + d + e;
            int avg = (sum) / 5;
            //输出
            Console.Write("\n学生姓名：" + name) ;
            Console.Write("\n学生总成绩：" + sum.ToString());
            Console.Write("\n学生平均成绩：" +avg.ToString());
            //等待
            Console.ReadKey();
        }

        public static int changeInt(String cj) {
            int rq;
            if (!int.TryParse(cj, out rq))
            {
                Console.Write("请输入正确的成绩：");
                String recj = Console.ReadLine();
                changeInt(recj);
            }
            return rq;
        }
    }

}

5、以下哪些标识符合法，哪些不合法

张三

_23
int

Int

a

b11_

123

李四+

Length