控制台下的学生成绩管理系统

namespace Alex_11_30_Practice{public struct Student//定义结构体★★重点{//将以下字段保存在结构体中public int number;public string Name;public float num1;public float num2;public float num3;}class Program{public static int count = 0;//定义下标计数器static void Main(string[] args){//首先打印出程序界面打印Student[] stu = new Student[50];//实例化一个结构体的50数组bool b = true;do{Console.WriteLine("========================================================");Console.WriteLine(" ☆☆★学生成绩管理系统★☆☆");Console.WriteLine("========================================================");Console.WriteLine("\t0.退出系统\t1录入信息\t2浏览信息");Console.WriteLine("\t3.信息排序\t4插入信息\t5删除信息");Console.WriteLine("\t6.查找信息\t7修改信息\t8清屏");Console.WriteLine("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");Console.WriteLine("请选择功能：");string str1 =Console.ReadLine();switch (str1)//用switch语句来实现功能的选择{case"0":Console.WriteLine("确定退出系统（Y/N）Alex编写"); four: string str2=Console.ReadLine();if (str2 == "Y" || str2 == "y"){b = false;}else if (str2 == "N" || str2 == "n"){break;}else{Console.Write("请正确输入：");goto four;}break;case"1": Insert(stu);break;case"2": B(stu); break;case"3": S(stu); break;case"4": I(stu); break;case"5": Del(stu); break;case"6": L(stu); break;case"7": R(stu); break;case"8": Console.Clear(); break;default: Console.WriteLine(" 警告：请输入正确的选项！"); break;}} while (b);}public static void Insert(Student[] st)//方法-录入信息{char ch = 'y';while (ch == 'y' || ch == 'Y'){one: Console.Write("请输入学号：");//用循环语句会非常繁琐，使用goto语句迎刃而解st[count].number = Int32.Parse(Console.ReadLine());for (int i = 0; i < count + 1; i++)//判断学号是否相同 goto语句的应用{if (st[i].number == st[count].number && (i != count)){Console.WriteLine(" 输入学号已存在！输入信息无效！"); st[count].number = st[count - 1].number;goto one;}}ooo: Console.Write("请输入姓名：");//判断姓名不为空st[count].Name = Console.ReadLine();if (st[count].Name==" " ){Console.WriteLine(" 警告：输入姓名为空！输入信息无效！");goto ooo;}Console.Write("请输入第一门成绩：");st[count].num1 = float.Parse(Console.ReadLine());Console.Write("请输入第二门成绩：");st[count].num2 = float.Parse(Console.ReadLine());Console.Write("请输入第三门成绩：");st[count].num3 = float.Parse(Console.ReadLine());count++;two:Console.WriteLine("是否继续Y/N");//goto语句跳转至此string str2 = Console.ReadLine();if (str2 == "Y" || str2 == "y"){ch = char.Parse(str2);}else if (str2 == "N" || str2 == "n"){break;}else{Console.WriteLine("请输入正确选择符号！");goto two;//goto语句的使用}}}public static void R(Student[] st)//方法-修改信息{if (count == 0){Console.WriteLine(" 警告：请先输入学生成绩信息！");}else{Console.Write("请输入您需要修改学生信息的学号：");int num4 = Int32.Parse(Console.ReadLine());for (int i = 0; i < count; i++){if (num4 == st[i].number){Console.WriteLine("请输入您要修改的信息：");Console.WriteLine("\t0.退出选项\t1.修改姓名\t2.修改第一门课成绩");Console.WriteLine("\t3.修改第二门课成绩\t\t4.修改第三门课成绩");int num5 = Int32.Parse(Console.ReadLine());switch (num5){case 0: break;case 1:Console.Write("姓名：");string name2 = Console.ReadLine();st[i].Name = name2;B(st);break;case 2:Console.Write("第一门课的成绩：");float num6 = float.Parse(Console.ReadLine());st[i].num1 = num6;B(st);break;case 3:Console.Write("第二门课的成绩：");float num7 = float.Parse(Console.ReadLine());st[i].num2 = num7;B(st);break;case 4:Console.Write("第三门课的成绩：");float num8 = float.Parse(Console.ReadLine());st[i].num3 = num8;B(st);break;}}}}}public static void L(Student[] st)//方法-查找信息有{Console.Write("请输入您要查找学生的姓名：");string sName = Console.ReadLine();if (count != 0){Console.WriteLine("学号\t姓名\t第一门课\t第二门课\t第三门课\t平均分");for (int i = 0; i < count; i++){if (st[i].Name == sName){float ave = (st[i].num1 + st[i].num2 + st[i].num3) / 3;Console.WriteLine(st[i].number + "\t" + st[i].Name + "\t" + st[i].num1 + "\t" + "\t" + st[i].num2 + "\t" + "\t" + st[i].num3 + "\t" + "\t" + ave); }}}else{Console.WriteLine(" 警告：请先输入学生的信息！");}}public static void B(Student[] st) //方法-浏览信息{if (count == 0){Console.WriteLine(" 警告：无学生信息可浏览！！"); }else{Console.WriteLine("学号\t姓名\t第一门课\t第二门课\t第三门课\t平均分");for (int i = 0; i < count; i++){float ave = (st[i].num1 + st[i].num2 + st[i].num3) / 3;Console.WriteLine(st[i].number + "\t" + st[i].Name + "\t" +st[i].num1 + "\t" + "\t" + st[i].num2 + "\t" + "\t" + st[i].num3 + "\t" + "\t" + ave); }}}public static void I(Student[] st)//方法-插入信息{Console.WriteLine("请输入需要插入学员的信息：");Insert(st);//直接调用录入信息的方法}public static void S(Student[] st)//方法-信息排序{Console.WriteLine("\ta.按学号排序\t\tb.按成绩排序");string str = Console.ReadLine();//按学号排序冒泡排序法小到大if (str == "a"||str=="A"){for (int j = 0; j < count; j++){for (int i = 1; i < count-j; i++){if (st[i - 1].number > st[i].number){Student temp = st[i];st[i] = st[i - 1];st[i - 1] = temp;//小->大}}}B(st);}else if (str == "b"||str=="B")//按平均分排序冒泡排序法大到小{for (int j = 0; j < count; j++){for (int i = 1; i < count-j; i++){float ave1 = (st[i - 1].num1 + st[i - 1].num2 + st[i - 1].num3) / 3;float ave2 = (st[i].num1 + st[i].num2 + st[i].num3) / 3;if (ave1 < ave2){Student temp = st[i];st[i] = st[i - 1];st[i - 1] = temp;}}}B(st);}else{Console.WriteLine("请正确输入！");}}public static void Del(Student[] st)//方法-删除信息{Console.Write("请输入您要删除的学号：");int num = Int32.Parse(Console.ReadLine());//Console.Read是读字符的ASCII 码值for (int n = 0; n < count; n++){if (num == st[n].number){for (int i = 0; i < count; i++){if (num == st[i].number){for (int j = 0; j < count; j++){if (num == st[j].number){num = j;}}for (int k = num; k < count - 1; k++)//把其后面的值赋给要删除的值，同时count-1{st[k] = st[k + 1];}count--;B(st);}}}}}}}。