diff --git a/b3.c b/b3.c
new file mode 100644
index 0000000..e6e29ee
--- /dev/null
+++ b/b3.c
@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+
+struct  Student {
+    int student_id;
+    float math_score;
+    float physics_score;
+    float english_score;
+    float total_score;
+    float average_score;
+} Student;
+
+
+
+void swap(struct Student *a, struct Student *b) {
+	struct Student temp;
+    temp = *a;
+    *a = *b;
+    *b = temp;
+}
+
+
+
+void sortStudentsByTotalScore(struct Student students[], int num)
+ {
+ 	int i,j;
+    for (i = 0; i < num- 1; i++) {
+        for (j = 0; j < num - i - 1; j++) {
+            if (students[j].total_score > students[j + 1].total_score) {
+                swap(&students[j], &students[j + 1]);
+            }
+        }
+    }
+}
+
+void display_menu() {
+    printf("%30s 1. Input\n", "");
+    printf("%30s 2. Output\n", "");
+    printf("%30s 3. Order\n", "");
+    printf("%30s 4. Quit\n", "");
+}
+
+void input_students(struct Student *students) {
+    printf("Please input info of the three students:\n");
+    int i;
+    for (i = 0; i < 3; i++) {
+        scanf("%d", &students[i].student_id);
+        scanf("%f", &students[i].math_score);
+        scanf("%f", &students[i].physics_score);
+        scanf("%f", &students[i].english_score);
+        students[i].total_score = students[i].math_score + students[i].physics_score + students[i].english_score;
+        students[i].average_score = students[i].total_score / 3.0;
+    }
+    
+	sortStudentsByTotalScore(students, 3);
+    for (i = 0; i < 3; i++) {
+        printf("%d,%.1f,%.1f\n", students[i].student_id, students[i].total_score, students[i].average_score);
+    }
+}
+
+int main() {
+    struct Student students[3];
+    char user_input[2];
+
+    while (1) {
+        display_menu();
+        scanf("%1s", user_input);  
+
+        switch (user_input[0]) {
+            case 'i':
+                input_students(students);
+                break;
+            case 'o':
+                printf("%30s You are trying to Output info\n"," ");
+                break;
+            case 'm':
+                printf("%30s You are trying to Make things ordered\n", "");
+                break;
+            case 'q':
+                printf("%30s You are about to Quit\n", "");
+               
+            default:
+                printf("%30s Wrong input\n", "");
+                break;
+        }
+    }
+
+    return 0;
+}