diff --git a/3.c b/3.c
new file mode 100644
index 0000000..6a84b16
--- /dev/null
+++ b/3.c
@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void inputStudentsInfo();
+void outputStudentsInfo();
+void orderStudentsInfo();
+
+int main() {
+    char input;
+  
+    while (1) {
+        printf("                              1.Input\n");
+        printf("                              2.Output\n");
+        printf("                              3.Order\n");
+        printf("                              4.Quit\n");
+        printf("Please enter your choice: ");
+        scanf(" %c", &input);
+      
+        switch (input) {
+            case '1':
+                inputStudentsInfo();
+                break;
+            case '2':
+                outputStudentsInfo();
+                break;
+            case '3':
+                orderStudentsInfo();
+                break;
+            case '4':
+                printf("You are about to Quit\n");
+                exit(0);
+            default:
+                printf("Wrong input\n");
+                break;
+        }
+    }
+  
+    return 0;
+}
+
+void inputStudentsInfo() {
+    int studentID[3];
+    float mathScore[3], physicsScore[3], englishScore[3], totalScore[3];
+  
+    printf("Please input info of the three students:\n");
+    for (int i = 0; i < 3; i++) {
+        printf("Student %d: ", i+1);
+        scanf("%d%f%f%f", &studentID[i], &mathScore[i], &physicsScore[i], &englishScore[i]);
+        totalScore[i] = mathScore[i] + physicsScore[i] + englishScore[i];
+    }
+  
+    printf("\nSorted students info:\n");
+    for (int i = 0; i < 3; i++) {
+        printf("学号%d,总成绩%.1f,平均成绩%.1f\n", studentID[i], totalScore[i], totalScore[i] / 3);
+    }
+}
+
+void outputStudentsInfo() {
+    printf("You are trying to Make things ordered\n");
+}
+
+void orderStudentsInfo() {
+    printf("Please enter your choice: ");
+    char input;
+    scanf(" %c", &input);
+  
+    switch(input) {
+        case 'q':
+        case 'Q':
+            printf("You are about to Quit\n");
+            exit(0);
+        default:
+            printf("Wrong input\n");
+            break;
+    }
+}