ADD file via upload

b5.c

@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define MAX_STUDENTS 100
+
+typedef struct Student {
+    char id[20];
+    int classNum;
+    char name[20];
+    double score1;
+    double score2;
+    double score3;
+} Student;
+
+int compare(const void *a, const void *b) {
+    Student *s1 = (Student *)a;
+    Student *s2 = (Student *)b;
+    if (s1->classNum!= s2->classNum) {
+        return s1->classNum - s2->classNum;
+    }
+    double sum1 = s1->score1 + s1->score2 + s1->score3;
+    double sum2 = s2->score1 + s2->score2 + s2->score3;
+    return (sum2 > sum1) - (sum2 < sum1);
+}
+
+int findByID(Student students[], int n, char id[]) {
+	int i;
+    for (i = 0; i < n; i++) {
+        if (strcmp(students[i].id, id) == 0) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+int findByName(Student students[], int n, char name[]) {
+	int i;
+    for ( i = 0; i < n; i++) {
+        if (strcmp(students[i].name, name) == 0) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+void deleteStudent(Student students[], int *n, int index) {
+	int i;
+    for ( i= index; i < *n - 1; i++) {
+        students[i] = students[i + 1];
+    }
+    (*n)--;
+}
+
+int main() {
+    Student students[MAX_STUDENTS];
+    int numStudents = 3;
+ 	int i;
+    strcpy(students[0].id, "10001");
+    students[0].classNum = 11;
+    strcpy(students[0].name, "Zhang");
+    students[0].score1 = 99.5;
+    students[0].score2 = 88.5;
+    students[0].score3 = 89.5;
+
+    strcpy(students[1].id, "10002");
+    students[1].classNum = 12;
+    strcpy(students[1].name, "Yang");
+    students[1].score1 = 77.9;
+    students[1].score2 = 56.5;
+    students[1].score3 = 87.5;
+
+    strcpy(students[2].id, "10003");
+    students[2].classNum = 11;
+    strcpy(students[2].name, "Liang");
+    students[2].score1 = 92.5;
+    students[2].score2 = 99.0;
+    students[2].score3 = 60.5;
+
+    qsort(students, numStudents, sizeof(Student), compare);
+
+    char input[20];
+    printf("please input the id or name you want to delete:");
+    scanf("%s", input);
+
+    int index = findByID(students, numStudents, input);
+    if (index == -1) {
+        index = findByName(students, numStudents, input);
+    }
+
+    if (index == -1) {
+        for ( i = 0; i < numStudents; i++) {
+            printf("%s %d %s %.1lf %.1lf %.1lf\n", students[i].id, students[i].classNum, students[i].name,
+                   students[i].score1, students[i].score2, students[i].score3);
+        }
+    } else {
+        
+        printf("Are you sure(yes/no)? ");
+        char confirm[10];
+        scanf("%s", confirm);
+        if (strcmp(confirm, "y") == 0) {
+             deleteStudent(students, &numStudents, index);
+            qsort(students, numStudents, sizeof(Student), compare);
+            for ( i = 0; i < numStudents; i++) {
+                printf("%s %d %s %.1lf %.1lf %.1lf\n", students[i].id, students[i].classNum, students[i].name,
+                       students[i].score1, students[i].score2, students[i].score3);
+            }
+    	}
+            if (strcmp(confirm, "n") == 0)
+            {
+            	for ( i = 0; i < numStudents; i++) {
+            printf("%s %d %s %.1lf %.1lf %.1lf\n", students[i].id, students[i].classNum, students[i].name,
+                   students[i].score1, students[i].score2, students[i].score3);
+			}
+        }
+    }
+
+    return 0;
+}