插入和删除信息

insertanddelete.cpp

@@ -0,0 +1,108 @@
+#include <stdio.h>  
+#include <string.h>  
+  
+struct Student {  
+    int studentId;  
+    int classId;  
+    char name[50];  
+    float scores[3];  
+};  
+  
+struct Student students[100];  
+int numStudents = 3; // 已有的学生数量  
+  
+void insertStudent(struct Student newStudent) {  
+    int i, j;  
+      
+    // 检查学号是否已存在  
+    for (i = 0; i < numStudents; i++) {  
+        if (students[i].studentId == newStudent.studentId) {  
+            printf("已存在学号为%d的学生信息。\n", newStudent.studentId);  
+            return;  
+        }  
+    }  
+      
+    // 寻找插入位置  
+    for (i = 0; i < numStudents; i++) {  
+        if (students[i].classId > newStudent.classId || (students[i].classId == newStudent.classId && newStudent.scores[0] + newStudent.scores[1] + newStudent.scores[2] > students[i].scores[0] + students[i].scores[1] + students[i].scores[2])) {  
+            break;  
+        }  
+    }  
+      
+    // 将插入位置之后的学生向后移动一个位置  
+    for (j = numStudents - 1; j >= i; j--) {  
+        students[j + 1] = students[j];  
+    }  
+      
+    // 插入新的学生信息  
+    students[i] = newStudent;  
+    numStudents++;  
+      
+    printf("新的学生信息已插入。\n");  
+}  
+  
+void deleteStudent(int studentId) {  
+    int i, j;  
+      
+    // 查找要删除的学生信息的位置  
+    for (i = 0; i < numStudents; i++) {  
+        if (students[i].studentId == studentId) {  
+            break;  
+        }  
+    }  
+      
+    // 如果找到了学生信息，则将之后的学生向前移动一个位置  
+    if (i < numStudents) {  
+        for (j = i + 1; j < numStudents; j++) {  
+            students[j - 1] = students[j];  
+        }  
+        numStudents--;  
+        printf("学生信息已删除。\n");  
+    } else {  
+        printf("未找到学号为%d的学生信息。\n", studentId);  
+    }  
+}  
+  
+void printStudents() {  
+    for (int i = 0; i < numStudents; i++) {  
+        printf("%d %d %s %.1f %.1f %.1f\n", students[i].studentId, students[i].classId, students[i].name, students[i].scores[0], students[i].scores[1], students[i].scores[2]);  
+    }  
+}  
+  
+int main() {  
+    // 初始化已有的学生信息  
+    students[0].studentId = 10001;  
+    students[0].classId = 11;  
+    strcpy(students[0].name, "Zhang");  
+    students[0].scores[0] = 85;  
+    students[0].scores[1] = 86;  
+    students[0].scores[2] = 90;  
+  
+    students[1].studentId = 10002;  
+    students[1].classId = 12;  
+    strcpy(students[1].name, "Li");  
+    students[1].scores[0] = 75;  
+    students[1].scores[1] = 76;  
+    students[1].scores[2] = 77;  
+  
+    students[2].studentId = 10003;  
+    students[2].classId = 13;  
+    strcpy(students[2].name, "Wang");  
+    students[2].scores[0] = 95;  
+    students[2].scores[1] = 96;  
+    students[2].scores[2] = 97;  
+  
+    // 打印所有学生信息  
+    printStudents();  
+  
+    // 插入新的学生信息  
+    insertStudent((struct Student){10004, 14, "Liu", {88, 90, 92}});  
+    printStudents();  
+  
+    // 删除学生信息  
+    deleteStudent(10003);  
+    printStudents();  
+  
+    return 0;  
+}
+