diff --git a/step5.cpp b/step5.cpp
new file mode 100644
index 0000000..4b35eb1
--- /dev/null
+++ b/step5.cpp
@@ -0,0 +1,101 @@
+#include <stdio.h>
+#include <string.h>
+
+int studentMember = 0;
+
+typedef struct storeInformation
+{
+	char stus[100];
+	int classes;
+	char names[100];
+	double mathGrade;
+	double physicsGrade;
+	double englishGrade;
+    int boolNew;
+}stu;
+
+stu studentInformation[100];
+
+void inputStudentInformation(int n)
+{
+	for (int i = 0; i < n; i++) {
+		scanf("%s", studentInformation[i].stus);
+		scanf("%d", &studentInformation[i].classes);
+		scanf("%s", studentInformation[i].names);
+		scanf("%lf", &studentInformation[i].mathGrade);
+		scanf("%lf", &studentInformation[i].physicsGrade);
+		scanf("%lf", &studentInformation[i].englishGrade);
+        studentMember++;
+        studentInformation[i].boolNew = 0;
+        printf("One student has been input!\n");
+	}
+}
+
+void insertedNew() {
+    int i = studentMember;
+    scanf("%s", studentInformation[i].stus);
+    scanf("%d", &studentInformation[i].classes);
+    scanf("%s", studentInformation[i].names);
+    scanf("%lf", &studentInformation[i].mathGrade);
+    scanf("%lf", &studentInformation[i].physicsGrade);
+    scanf("%lf", &studentInformation[i].englishGrade);
+    studentMember++;
+    studentInformation[i].boolNew = 1;
+    printf("One student has been input!\n");
+}
+
+void printStudentOriginalScore() {
+    for (int i = 0; i < studentMember; i++) {
+        if (studentInformation[i].stus != 0) {
+            printf("%s  %d  %s  %.1f  %.1f  %.1f  %s\n", studentInformation[i].stus, studentInformation[i].classes, studentInformation[i].names, studentInformation[i].mathGrade, studentInformation[i].physicsGrade, studentInformation[i].englishGrade, studentInformation[i].boolNew == 0 ? "" : "inserted");
+        }
+    }
+}
+
+void informationClear(char a[100]) {
+    int i = 0;
+    for (i = 0; i < studentMember; i++) {
+        if (strcmp(a, studentInformation[i].stus) == 0 || strcmp(a, studentInformation[i].names) == 0) {
+            memset(&studentInformation[i], 0, sizeof(studentInformation[i]));
+        }
+    }
+}
+
+void manage()
+{
+    printf("                              1.Input\n");
+    printf("                              2.Output\n");
+    printf("                              3.Order\n");
+    printf("                              4.Quit\n");
+    char keywords;
+    keywords = getchar();
+    switch (keywords) {
+    case 'i':
+        printf("Please input info of the three students\n");
+        inputStudentInformation(3);
+        break;
+    case 'o':
+        printf("You are trying to Output info\n");
+        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;
+    }
+}
+
+int main()
+{
+    char a[100];
+    manage();
+    printf("Enter your clear student.\n");
+    scanf("%s", &a);
+    informationClear(a);
+    printStudentOriginalScore();
+    return 0;
+}
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