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实验步骤1.c

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+#include <stdio.h>
+
+// 函数声明
+void displayMenu();
+
+int main() {
+    char input; // 用于存储用户输入的字符
+
+    while (1) {
+        displayMenu(); // 显示菜单
+
+        printf("Please enter your choice: ");
+        scanf(" %c", &input); // 读取用户输入
+
+        switch (input) {
+            case 'i':
+                printf("You are trying to Input info\n");
+                break;
+            case 'o':
+                printf("You are trying to Output info\n");
+                break;
+            case 'm':
+                printf("You are trying to Make things ordered\n");
+                break;
+            case 'q':
+                printf("You are about to Quit\n");
+                return 0; // 退出程序
+            default:
+                printf("Wrong input\n");
+                break;
+        }
+    }
+
+    return 0;
+}
+
+// 菜单显示函数
+void displayMenu() {
+    printf("\n");
+    printf("                              1.Input\n");
+    printf("                              2.Output\n");
+    printf("                              3.Order\n");
+    printf("                              4.Quit\n");
+    printf("\n");
+}
+

实验步骤2.c

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+#include <stdio.h>
+
+#define MAX_STUDENTS 3 // 定义学生数量
+
+typedef struct {
+    int id;            // 学号
+    double math;       // 高数成绩
+    double physics;    // 大学物理成绩
+    double english;    // 英语成绩
+    double total;      // 总成绩
+} Student;
+
+// 函数声明
+void displayMenu();
+void inputStudents(Student students[]);
+void displayStudents(const Student students[]);
+
+int main() {
+    char input;                 // 用户选择的菜单选项
+    Student students[MAX_STUDENTS]; // 存储学生信息
+    int isInputDone = 0;        // 标志是否完成录入
+
+    while (1) {
+        displayMenu(); // 显示菜单
+
+        printf("Please enter your choice: ");
+        scanf(" %c", &input); // 读取用户输入
+
+        switch (input) {
+            case 'i':
+                printf("You are trying to Input info\n");
+                inputStudents(students);
+                isInputDone = 1; // 标记为已完成录入
+                break;
+            case 'o':
+                if (isInputDone) {
+                    printf("You are trying to Output info\n");
+                    displayStudents(students);
+                } else {
+                    printf("No information available. Please input info first.\n");
+                }
+                break;
+            case 'm':
+                printf("You are trying to Make things ordered\n");
+                break;
+            case 'q':
+                printf("You are about to Quit\n");
+                return 0; // 退出程序
+            default:
+                printf("Wrong input\n");
+                break;
+        }
+    }
+
+    return 0;
+}
+
+// 显示菜单函数
+void displayMenu() {
+    printf("\n");
+    printf("                              1.Input\n");
+    printf("                              2.Output\n");
+    printf("                              3.Order\n");
+    printf("                              4.Quit\n");
+    printf("\n");
+}
+
+// 录入学生信息
+void inputStudents(Student students[]) {
+    int i; // 循环变量移到外部声明
+    for (i = 0; i < MAX_STUDENTS; i++) {
+        printf("Enter information for student %d:\n", i + 1);
+        
+        // 输入学号（5位自然数）
+        do {
+            printf("ID (5-digit number): ");
+            scanf("%d", &students[i].id);
+            if (students[i].id < 10000 || students[i].id > 99999) {
+                printf("Invalid ID. Please enter a 5-digit number.\n");
+            }
+        } while (students[i].id < 10000 || students[i].id > 99999);
+
+        // 输入成绩
+        printf("Math score (e.g., 85.0): ");
+        scanf("%lf", &students[i].math);
+        printf("Physics score (e.g., 99.0): ");
+        scanf("%lf", &students[i].physics);
+        printf("English score (e.g., 77.5): ");
+        scanf("%lf", &students[i].english);
+
+        // 计算总成绩
+        students[i].total = students[i].math + students[i].physics + students[i].english;
+    }
+    printf("Input completed.\n");
+}
+
+// 显示学生信息
+void displayStudents(const Student students[]) {
+    int i; // 循环变量移到外部声明
+    printf(" ID      Math    Physics English Total\n");
+    for (i = 0; i < MAX_STUDENTS; i++) {
+        printf("%05d  %.1f    %.1f    %.1f    %.1f\n",
+               students[i].id,
+               students[i].math,
+               students[i].physics,
+               students[i].english,
+               students[i].total);
+    }
+}
+