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step3.c

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+#include <stdio.h>
+typedef struct {
+    int id;
+    double scores[3];
+    double total;
+    double average;
+} Student;
+void displayMenu();
+void inputStudentInfo(Student students[], int count);
+void calculateTotalAndAverage(Student students[], int count);
+void sortStudentsByTotalScore(Student students[], int count);
+void displayStudentInfo(Student students[], int count);
+
+int main() {
+    Student students[3]; 
+    char choice;
+    do {
+        displayMenu();
+        scanf("%c", &choice); 
+		rewind(stdin);
+        switch (choice) {
+            case 'i':
+                inputStudentInfo(students, 3);
+                calculateTotalAndAverage(students, 3);
+                sortStudentsByTotalScore(students, 3);
+                displayStudentInfo(students, 3);
+                break;
+            case 'm':
+                printf("You are trying to Make things ordered\n");
+                break;
+            case 'q':
+                printf("You are about to Quit\n");
+                break;
+            default:
+                printf("Wrong input\n");
+                break;
+        }
+    } while (choice != 'q');
+
+    return 0;
+}
+
+void displayMenu() {
+    printf("\n");
+	int i; 
+    for (i = 0; i < 30; i++) printf(" ");
+    printf("1. Input\n");
+    for (i = 0; i < 30; i++) printf(" ");
+    printf("2. Output\n");
+    for (i = 0; i < 30; i++) printf(" ");
+    printf("3. Order\n");
+    for (i = 0; i < 30; i++) printf(" ");
+    printf("4. Quit\n");
+    printf("\nPlease input your option: ");
+}
+
+void inputStudentInfo(Student students[], int count) {
+    printf("Please input info of the three students:\n");
+    int i,j;
+    for (i = 0; i < count; i++) {
+        printf("");
+        scanf("%d", &students[i].id);
+        for (j = 0; j < 3; j++) {
+            printf("");
+            scanf("%lf", &students[i].scores[j]);
+        }
+    }
+}
+
+void calculateTotalAndAverage(Student students[], int count) {
+	int i,j;
+    for ( i = 0; i < count; i++) {
+        students[i].total = 0;
+        for ( j = 0; j < 3; j++) {
+            students[i].total += students[i].scores[j];
+        }
+        students[i].average = students[i].total / 3;
+    }
+}
+
+void sortStudentsByTotalScore(Student students[], int count) {
+    Student temp;
+    int i,j;
+    for (i = 0; i < count - 1; i++) {
+        for (j = 0; j < count - i - 1; j++) {
+            if (students[j].total > students[j + 1].total) {
+                temp = students[j];
+                students[j] = students[j + 1];
+                students[j + 1] = temp;
+            }
+        }
+    }
+}
+
+void displayStudentInfo(Student students[], int count) {
+	int i;
+    for ( i = 0; i < count; i++) {
+        printf("%d,%.1f,%.1f\n", students[i].id, students[i].total, students[i].average);
+    }
+}