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step7.c

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+
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_STUDENTS 100
+
+struct student {
+    int id;
+    int class;
+    char name[20];
+    float score1;
+    float score2;
+    float score3;
+};
+
+void search(struct student students[], int num_students, int query);
+void sort(struct student students[], int num_students);
+void output(struct student students[], int num_students);
+
+int main() {
+    struct student students[MAX_STUDENTS] = {
+           {10001, 11, "Zhang", 99.5, 88.5, 89.5},
+           {10002, 12, "Yang", 77.9, 56.5, 87.5},
+           {10003, 11, "Liang", 92.5, 99.0, 60.5},
+           {10004, 11, "Cai", 89.6, 56.9, 90.5},
+           {10005, 14, "Fu", 55.6, 67.9, 98.9},
+           {10006, 12, "Mao", 22.1, 45.9, 99.2},
+           {10007, 13, "Zhan", 35.6, 67.9, 88.0}
+    };
+    int num_students = 7;
+
+
+    int query = 0;
+    printf("请输入查询要求：\n");
+    scanf("%d", &query);
+    search(students, num_students, query);
+    sort(students, num_students);
+
+    return 0;
+}
+
+
+
+
+void search(struct student students[], int num_students, int query) {
+    printf("查询结果如下：\n");
+    if (query == 1) {
+        int class_start, class_end;
+        scanf("%d-%d", &class_start, &class_end);
+        for (int k = 0; k < num_students; k++) {
+            struct student s = students[k];
+            if (s.class >= class_start && s.class <= class_end) {
+                printf("%d %d %s %.1f %.1f %.1f\n", s.id, s.class, s.name, s.score1, s.score2, s.score3);
+            }
+        }
+    }
+    else if (query == 2) {
+        int id_start, id_end;
+        scanf("%d-%d", &id_start, &id_end);
+        for (int k = 0; k < num_students; k++) {
+            struct student s = students[k];
+            if (s.id >= id_start && s.id <= id_end) {
+                printf("%d %d %s %.1f %.1f %.1f\n", s.id, s.class, s.name, s.score1, s.score2, s.score3);
+            }
+        }
+    }
+    else if (query == 3) {
+        char nam[20];
+        scanf("%s", nam);
+        for (int k = 0; k < num_students; k++) {
+            struct student s = students[k];
+            if (strstr(s.name, nam) == s.name) {
+                printf("%d %d %s %.1f %.1f %.1f\n", s.id, s.class, s.name, s.score1, s.score2, s.score3);
+            }
+        }
+    }
+    else if (query == 4) {
+        float score;
+        scanf("%f", &score);
+        for (int k = 0; k < num_students; k++) {
+            struct student s = students[k];
+            if (s.score1 + s.score2 + s.score3 >= score) {
+                printf("%d %d %s %.1f %.1f %.1f\n", s.id, s.class, s.name, s.score1, s.score2, s.score3);
+            }
+        }
+    }
+}
+
+void sort(struct student students[], int num_students) {
+    // 冒泡排序示例
+    for (int i = 0; i < num_students - 1; i++) {
+        for (int j = 0; j < num_students - i - 1; j++) {
+            // 计算总成绩
+            float total_j = students[j].score1 + students[j].score2 + students[j].score3;
+            float total_j1 = students[j + 1].score1 + students[j + 1].score2 + students[j + 1].score3;
+
+            if (total_j < total_j1) {
+                // 交换学生数据
+                struct student temp = students[j];
+                students[j] = students[j + 1];
+                students[j + 1] = temp;
+            }
+        }
+    }
+}
+
+void output(struct student students[], int num_students) {
+    int i;
+    printf("学号\t班级\t姓名\t\t科目1\t科目2\t科目3\n");
+    for (i = 0; i < num_students; i++) {
+        struct student s = students[i];
+        printf("%d\t%d\t%-12s\t%.1f\t%.1f\t%.1f\n", s.id, s.class, s.name, s.score1, s.score2, s.score3);
+    }
+}