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1、变量a、b、c之和为：55 int a = 15, b, c, sum; b = c = 20; sum = a + b + c; lblShow.Text = 变量a、b、c之和为: + sum; 2、枚举变量currentSeason的值为：11 枚举变量nextSeason代表枚举元素：Winter public partial class Form1 : Form { enum Season { Spring = 10, Summer, Autumn = 20, Winter }; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { Season currentSeason, nextSeason; currentSeason = Season.Summer; nextSeason = (Season)21; lblShow.Text = 枚举变量currentSeason的值为: + (int)currentSeason; lblShow.Text += \n枚举变量nextSeason代表枚举元素: + nextSeason; } } 3、学生信息：姓名： 学号： 性别： 年龄 public partial class Form1 : Form { struct Student { public int stuNo; public string stuName; public int age; public char sex; } public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { Student stu; stu.stuNo = 1001; stu.stuName = 乔峰; stu.age = 23; stu.sex = 男; lblShow.Text = 学生信息:\n姓名: + stu.stuName; lblShow.Text += \n学号: + stu.stuNo; lblShow.Text += \n性别: + stu.sex; lblShow.Text += \n年龄: + stu.age; } } 4、算数运算符的应用测试 private void Form1_Load(object sender, EventArgs e) { int num1 = 5, num2 = 2; int a = num1 % num2; int b = num1 /num2 ; lblShow .Text = num1 + % + num2 + = + a ; lblShow .Text += \n + num1 + / + num2 + = + b ; a=num1 ++; b=--num2; lblShow .Text += \n + a=num1++;后 num1 = + num1 + , a = + a ; lblShow .Text += \n + b=--num2;后 num2 = + num2 + , b = + b; } 5、赋值运算符及隐式数据类型转换应用测试 private void Form1_Load(object