diff --git a/SIMager.h b/SIMager.h
new file mode 100644
index 0000000..96e2284
--- /dev/null
+++ b/SIMager.h
@@ -0,0 +1,65 @@
+//
+//  SIMager.h
+//  SIManager
+//
+//  Created by Eric on 15-8-16.
+//  Copyright (c) 2015年 Eric. All rights reserved.
+//
+
+#ifndef SIManager_SIMager_h
+#define SIManager_SIMager_h
+
+#include   <stdio.h>
+#include   <stdlib.h>
+#include   <time.h>
+#include   <string.h>
+#include   <time.h>
+
+#define MAX_NUM 64
+#define PASSED_MAX 12
+#define WEIGHT_LENGTH_SQUARE 50
+#define HEIGHT_LENGTH_SQUARE 4
+#define MENU_NUM 4
+#define MENU_WEIGHT 3
+#define MENU_COMTEST 3
+#define MENU_1 "1.Add Students Information"
+#define MENU_2 "2.Search Students Information"
+#define MENU_3 "3.Delete Students Information"
+#define MENU_4 "4.Change Password"
+
+//SYSTEM DIFFERENT (WINNDOWS: Clear = Cls)
+#define CLEAR system("clear");
+
+struct _students{
+    char name[12];
+    char class[6];
+    char year[6];
+    char number[28];
+};
+struct student{
+    struct _students stu_info;
+    struct student *next;
+    struct student *front;
+} students;
+
+typedef struct student stuc;
+
+void start_printf (int menu_number, char *MENU[]);
+int add_info (int const max_count);
+
+int search_info_menu(void);
+stuc *search_info_read(void);
+stuc *search_info_name(stuc *head);
+stuc *search_info_class(stuc *head);
+stuc *search_info_year(stuc *head);
+stuc *search_info_number(stuc *head);
+int delete_info_printf(stuc *head, stuc *r_head);
+int search_info_printf(stuc *head);
+
+int delete_data_menu (void);
+void passwd_set (void);
+void passwd_pass (void);
+void menu_main (void);
+char choice (char *string);
+
+#endif
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..8b58c2d
--- /dev/null
+++ b/main.c
@@ -0,0 +1,848 @@
+//
+//  main.c
+//  SIManager
+//
+//  Created by Eric on 15-7-6.
+//  Copyright (c) 2015年 Eric. All rights reserved.
+//
+
+#include "SIMager.h"
+
+int main(int argc, const char * argv[]) {
+    CLEAR    passwd_pass();
+    
+    return 0;
+}
+
+//PAINT MENU
+void start_printf (int menu_number, char *MENU[]){
+    
+    for (int i = 0; i < WEIGHT_LENGTH_SQUARE; i++) printf("■");
+    printf("\n");
+    for (int i = 0; i < menu_number; i++ ){
+        printf("■");
+        for (int j = 0; j<MENU_WEIGHT; j++) printf(" ");
+        printf("%s ",*(MENU+i));
+        unsigned long length = strlen(*(MENU+i));
+        for (int j = 0; j < (WEIGHT_LENGTH_SQUARE - (MENU_WEIGHT + length + 3)); j++) printf(" ");
+        printf("■\n");
+    }
+    for (int i = 0; i < WEIGHT_LENGTH_SQUARE; i++) printf("■");
+    printf("\n");
+}
+
+//MAIN MENTU PAINT CONTROL
+void menu_main (void){
+    
+    char *MENU[MENU_NUM] = {
+        MENU_1,
+        MENU_2,
+        MENU_3,
+        MENU_4,
+    };
+    while (1){
+    int ifnot = 1;
+    start_printf(4, MENU);
+    while (ifnot == 1){
+        char choices = choice("Please input the number (q to quit): ");
+        int num_stu=0;
+        switch (choices) {
+            case '1':
+                printf("How many students: ");
+                scanf("%d",&num_stu);
+                CLEAR                add_info(num_stu);
+                ifnot = 0;
+                break;
+            case '2':
+                CLEAR                search_info_menu();
+                ifnot = 0;
+                break;
+            case '3':
+                CLEAR                delete_data_menu();
+                ifnot = 0;
+                break;
+            case '4':
+                CLEAR                passwd_set();
+                ifnot = 0;
+                break;
+            case 'q':
+                exit(0);
+                break;
+                
+            default:
+                printf("Wrong,try again!\n");
+                break;
+        }
+        
+    }
+       CLEAR    }
+    
+}
+
+//RETURN THE CHOICS OF USER
+char choice (char *string){
+    printf("%s: ",string);
+    char first_choice[MAX_NUM] ,choice = '0';
+    scanf("%s",first_choice);
+    choice = first_choice[0];
+    if (first_choice[1] != '\0') return 'E';
+    return choice;
+}
+
+//DEAL WITH PASSWORD
+void passwd_pass (void){
+    char *LOGIN_MENU[] = {
+        "                 LOGIN",
+    };
+    start_printf(1, LOGIN_MENU);
+    int count = 0, c_count = 3;
+    char passwd[12];
+    for (int i = 0; i < 12; i++) passwd[i] = 0;
+    while (c_count > 0){
+        count = 0;
+        printf("Input the password (Chance :  %d) : ",c_count);
+        char temp = '0';
+        while ((count < PASSED_MAX)&& (temp != '\n')){
+            passwd [count] = getchar();
+            temp = passwd [count];
+            count++;
+        }
+        passwd[--count] = '\0';
+        int pass = 0;
+        char r_passwd[12];
+        FILE *fp = fopen("passwd.db", "r");
+        fscanf(fp,"%s",r_passwd);
+        fclose(fp);
+        if (strcmp(passwd,r_passwd) == 0) pass =1;
+        if (pass == 1){
+            CLEAR            menu_main();
+            break;
+        }
+        else {
+            printf("Wrong,try again!\n");
+            c_count--;
+        }
+    }
+}
+
+//ADD STUDENTS INFO
+int add_info (int const max_count){
+    int *count = (int*) malloc(sizeof(int));
+    int w_ifnot = 0;
+    stuc *head = NULL;
+    *count = 1;
+    stuc *stu = NULL, *stu_last = NULL;
+    struct _students *stu_s;
+    while((*count) <= max_count){
+        w_ifnot = 0;
+        for (int i = 0; i < 20-(*count % 10); i++ ) printf("■");
+        printf("[ %d ] of [ %d ]",*count,max_count);
+        for (int i = 0; i < 20-(*count % 10); i++ ) printf("■");
+        printf("\n");
+        char u_name[12],u_class[6],u_year[6],u_number[28] = "";
+        printf("NAME: ");
+        scanf("%s",u_name);
+        printf("CLASS: ");
+        scanf("%s",u_class);
+        printf("YEAR: ");
+        scanf("%s",u_year);
+        int int_uname = (int)u_name[0], int2_uname = (int)u_name[1];
+        char u1_name[4] = {'0','0','0','\0'}, u2_name[4] = {'0','0','0','\0'};
+        char c_rand[4]={'0','0','0','\0'};
+        for (int i = 2; i >= 0;i--){
+            u1_name[i] = (int_uname%10)+48;
+            int_uname/=10;
+        }
+        for (int i = 2; i >= 0;i--){
+            u2_name[i] = (int2_uname%10)+48;
+            int2_uname/=10;
+        }
+        
+        srand((unsigned int)time(0));
+        int int_rand = (rand()%1000);
+        for (int i = 2; i >= 0;i--){
+            c_rand[i] = (int_rand%10)+48;
+            int_rand/=10;
+        }
+        strcat(u_number, u_year);
+        strcat(u_number, u_class);
+        strcat(u_number, u1_name);
+        strcat(u_number, u2_name);
+        strcat(u_number, c_rand);
+        
+        printf("NUMBER: %s\n",u_number);
+        for (int i = 0; i < WEIGHT_LENGTH_SQUARE+2; i++ ) printf("■");
+        printf("\n");
+        printf("YES?(y or n): ");
+        char yon = 'y';
+        getchar();
+        scanf("%c",&yon);
+        switch (yon) {
+            case 'y':
+                w_ifnot = 1;
+                break;
+            case '\n':
+                w_ifnot = 1;
+                break;
+            default:
+                w_ifnot = 0;
+                break;
+        }
+        if (w_ifnot == 1){
+            stu = (stuc*) malloc(sizeof(stuc));
+            stu_s = &stu->stu_info;
+            strcpy(stu_s->name,u_name);
+            strcpy(stu_s->class,u_class);
+            strcpy(stu_s->year,u_year);
+            strcpy(stu_s->number,u_number);
+            (*count)++;
+        }
+        if ((head == NULL) && (w_ifnot == 1)){
+            head = stu;
+            stu_last = head;
+        }
+        else if ((head != NULL) && (w_ifnot == 1)){
+            stu_last->next = stu;
+            stu_last = stu;
+            if(*count == max_count) stu->next = NULL;
+            }
+            CLEAR    }
+    
+    stu = head;
+    FILE *fp;
+    fp = fopen("stuinfo.db", "a+");
+    if (fp == NULL) {
+        printf("ERROR IN OPEN FILE!");
+        return -1;
+    }
+    for (int i = 0; i < max_count; i++){
+        stu_s = &stu->stu_info;
+        fprintf(fp, "%s\n",stu_s->name);
+        fprintf(fp, "%s\n",stu_s->class);
+        fprintf(fp, "%s\n",stu_s->year);
+        fprintf(fp, "%s\n",stu_s->number);
+        stu = stu->next;
+    }
+    
+    
+    fclose(fp);
+    free(count);
+    //内存泄漏问题();
+    
+    //
+    count = NULL;
+    printf("Done,any key to continue...\n");
+    getchar();getchar();
+    
+    return 0;
+ 
+ }
+
+//MENU OF SEARCH
+int search_info_menu(){
+    
+    char *SEARCH_MENU[5] = {
+        "                 SEARCH",
+        "1.NAME",
+        "2.CLASS",
+        "3.YEAR",
+        "4.NUMBER",
+    };
+    start_printf(5, SEARCH_MENU);
+    int ifnot = 1;
+    stuc *head, *s_head;
+    while (ifnot){
+        char choices = choice("Choose the number (q to quit): ");
+        switch(choices){
+            case '1':
+                head = search_info_read();
+                s_head = search_info_name(head);
+                search_info_printf(s_head);
+                ifnot = 0;
+                break;
+            case '2':
+                head = search_info_read();
+                s_head = search_info_class(head);
+                search_info_printf(s_head);
+                ifnot = 0;
+                break;
+            case '3':
+                head = search_info_read();
+                s_head = search_info_year(head);
+                search_info_printf(s_head);
+                ifnot = 0;
+                break;
+            case '4':
+                head = search_info_read();
+                s_head = search_info_number(head);
+                search_info_printf(s_head);
+                ifnot = 0;
+                break;
+            case 'q':
+                ifnot = 0;
+                break;
+            default:
+                printf("Wrong,please try again!\n");
+                break;
+        }
+        
+    }
+    return 0;
+}
+
+//READ FILE TO MAKE TABLE
+stuc *search_info_read(){
+    FILE *fp = fopen("stuinfo.db", "r");
+    if (fp == NULL){
+        printf("ERROR IN OPEN FILE!");
+        return NULL;
+    }
+    stuc *stu = NULL, *head = NULL, *stu_last = NULL;
+    struct _students *stu_s = NULL;
+    stu = (stuc*) malloc(sizeof(stuc));
+    stu_s = &stu->stu_info;
+    while (fscanf(fp,"%s",stu_s->name) != EOF){
+        fscanf(fp, "%s",stu_s->class);
+        fscanf(fp, "%s",stu_s->year);
+        fscanf(fp, "%s",stu_s->number);
+        if (head == NULL){
+            head = stu;
+            stu_last = head;
+            stu->front = NULL;
+        }
+        else {
+            stu_last->next = stu;
+            stu->front = stu_last;
+            stu_last = stu;
+        }
+        stu = (stuc*) malloc(sizeof(stuc));
+        stu_s = &stu->stu_info;
+    }
+    stu->next = NULL;
+    fclose(fp);
+    return head;
+}
+
+//SERACH INFO FROM CLASS
+stuc *search_info_class(stuc *head){
+    printf("CLASS: ");
+    char s_class[6]= {'\0','\0','\0','\0','\0','\0'};
+    scanf("%s",s_class);
+    CLEAR    stuc *p_head = head, *s_head = NULL,*s_stu = NULL, *s_stu_last = NULL;
+    struct _students *p_head_s = &p_head->stu_info;
+    struct _students *s_head_s = NULL;
+    p_head_s = &p_head->stu_info;
+    int ifnot = 0;
+    while (p_head != NULL){
+        if (strcmp(p_head_s->class, s_class) == 0){
+            ifnot = 1;
+            s_stu = (stuc*) malloc(sizeof(stuc));
+            s_head_s = &s_stu->stu_info;
+            strcpy(s_head_s->name,p_head_s->name);
+            strcpy(s_head_s->class,p_head_s->class);
+            strcpy(s_head_s->year,p_head_s->year);
+            strcpy(s_head_s->number,p_head_s->number);
+            if(s_head == NULL){
+                s_head = s_stu;
+                s_stu_last = s_head;
+                s_head->front = NULL;
+            }
+            else {
+                s_stu_last->next = s_stu;
+                s_stu->front = s_stu_last;
+                s_stu_last = s_stu;
+            }
+        }
+        p_head = p_head->next;
+        p_head_s = &p_head->stu_info;
+    }
+    if (ifnot){
+        s_stu->next = NULL;
+    }
+    else{
+        return NULL;
+    }
+    return s_head;
+}
+
+//SERACH INFO FROM NAME
+stuc *search_info_name(stuc *head){
+    printf("NAME: ");
+    char s_name[12];
+    scanf("%s",s_name);
+    CLEAR    stuc *p_head = head, *s_head = NULL,*s_stu = NULL, *s_stu_last = NULL;
+    struct _students *p_head_s = &p_head->stu_info;
+    struct _students *s_head_s = NULL;
+    p_head_s = &p_head->stu_info;
+    int ifnot = 0;
+    while (p_head != NULL){
+        if (strcmp(p_head_s->name, s_name) == 0){
+            ifnot = 1;
+            s_stu = (stuc*) malloc(sizeof(stuc));
+            s_head_s = &s_stu->stu_info;
+            strcpy(s_head_s->name,p_head_s->name);
+            strcpy(s_head_s->class,p_head_s->class);
+            strcpy(s_head_s->year,p_head_s->year);
+            strcpy(s_head_s->number,p_head_s->number);
+            if(s_head == NULL){
+                s_head = s_stu;
+                s_stu_last = s_head;
+                s_head->front = NULL;
+            }
+            else {
+                s_stu_last->next = s_stu;
+                s_stu->front = s_stu_last;
+                s_stu_last = s_stu;
+            }
+        }
+        p_head = p_head->next;
+        p_head_s = &p_head->stu_info;
+    }
+    if (ifnot){
+        s_stu->next = NULL;
+    }
+    else{
+        return NULL;
+    }
+    
+    return s_head;
+}
+
+
+//SERACH INFO FROM YEAR
+stuc *search_info_year(stuc *head){
+    
+    printf("YEAR: ");
+    char s_year[12];
+    scanf("%s",s_year);
+    CLEAR    stuc *p_head = head, *s_head = NULL,*s_stu = NULL, *s_stu_last = NULL;
+    struct _students *p_head_s = &p_head->stu_info;
+    struct _students *s_head_s = NULL;
+    p_head_s = &p_head->stu_info;
+    int ifnot = 0;
+    while (p_head != NULL){
+        if (strcmp(p_head_s->year, s_year) == 0){
+            ifnot = 1;
+            s_stu = (stuc*) malloc(sizeof(stuc));
+            s_head_s = &s_stu->stu_info;
+            strcpy(s_head_s->name,p_head_s->name);
+            strcpy(s_head_s->class,p_head_s->class);
+            strcpy(s_head_s->year,p_head_s->year);
+            strcpy(s_head_s->number,p_head_s->number);
+            if(s_head == NULL){
+                s_head = s_stu;
+                s_stu_last = s_head;
+                s_head->front = NULL;
+            }
+            else {
+                s_stu_last->next = s_stu;
+                s_stu->front = s_stu_last;
+                s_stu_last = s_stu;
+            }
+        }
+        p_head = p_head->next;
+        p_head_s = &p_head->stu_info;
+    }
+    if (ifnot){
+        s_stu->next = NULL;
+    }
+    else{
+        return NULL;
+    }
+    CLEAR    return s_head;
+}
+
+//SERACH INFO FROM NUMBER
+stuc *search_info_number(stuc *head){
+    
+    printf("NUMBER: ");
+    char s_number[28];
+    scanf("%s",s_number);
+    CLEAR    stuc *p_head = head, *s_head = NULL,*s_stu = NULL, *s_stu_last = NULL;
+    struct _students *p_head_s = &p_head->stu_info;
+    struct _students *s_head_s = NULL;
+    p_head_s = &p_head->stu_info;
+    int ifnot = 0;
+    while (p_head != NULL){
+        if (strcmp(p_head_s->number, s_number) == 0){
+            ifnot = 1;
+            s_stu = (stuc*) malloc(sizeof(stuc));
+            s_head_s = &s_stu->stu_info;
+            strcpy(s_head_s->name,p_head_s->name);
+            strcpy(s_head_s->class,p_head_s->class);
+            strcpy(s_head_s->year,p_head_s->year);
+            strcpy(s_head_s->number,p_head_s->number);
+            if(s_head == NULL){
+                s_head = s_stu;
+                s_stu_last = s_head;
+                s_head->front = NULL;
+            }
+            else {
+                s_stu_last->next = s_stu;
+                s_stu->front = s_stu_last;
+                s_stu_last = s_stu;
+            }
+        }
+        p_head = p_head->next;
+        p_head_s = &p_head->stu_info;
+    }
+    if (ifnot){
+        s_stu->next = NULL;
+    }
+    else{
+        return NULL;
+    }
+    CLEAR    return s_head;
+}
+
+
+//PRINTF THE RESULT OF THE SEARCH
+int search_info_printf(stuc *head){
+    stuc *p_head = head;
+    int count = 0;
+    if(head == NULL){
+        char *PRINTF_MENU[5] = {
+            "                 Not Found",
+        };
+        start_printf(1, PRINTF_MENU);
+        printf("Done!(Any key to continue...)");
+        getchar();getchar();
+        CLEAR        return 0;
+    };
+    struct _students *p_head_s = &p_head->stu_info;
+    int ifnot = 1;
+    char input = 'e';
+    while (ifnot){
+        if ((input == 'w') && (p_head != NULL)){
+            CLEAR            if (p_head->next != NULL){
+            count++;
+            p_head = p_head->next;
+            p_head_s = &p_head->stu_info;
+            }
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("[ %d ]", count);
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("\n");
+            printf("NAME: %s\n",p_head_s->name);
+            printf("CLASS: %s\n",p_head_s->class);
+            printf("YEAR: %s\n",p_head_s->year);
+            printf("NUMBER: %s\n",p_head_s->number);
+            for (int i = 0; i < WEIGHT_LENGTH_SQUARE-7; i++ ) printf("■");
+            printf("\n");
+        }
+        else if ((input == 's') && (p_head != NULL)){
+            CLEAR            if (p_head->front != NULL){
+            p_head = p_head->front;
+            p_head_s = &p_head->stu_info;
+            count--;
+            }
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("[ %d ]", count);
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("\n");
+            printf("NAME: %s\n",p_head_s->name);
+            printf("CLASS: %s\n",p_head_s->class);
+            printf("YEAR: %s\n",p_head_s->year);
+            printf("NUMBER: %s\n",p_head_s->number);
+            for (int i = 0; i < WEIGHT_LENGTH_SQUARE-7; i++ ) printf("■");
+            printf("\n");
+        }
+        else if ((input == 'e') && (p_head != NULL)){
+            count++;
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("[ %d ]", count);
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("\n");
+            printf("NAME: %s\n",p_head_s->name);
+            printf("CLASS: %s\n",p_head_s->class);
+            printf("YEAR: %s\n",p_head_s->year);
+            printf("NUMBER: %s\n",p_head_s->number);
+            for (int i = 0; i < WEIGHT_LENGTH_SQUARE-7; i++ ) printf("■");
+            printf("\n");
+        }
+        else{
+            
+        }
+        
+        if ((p_head->front == NULL) && (input != 'q')){
+            printf("■:This is the first element in the list.\n");
+        }
+        
+        if ((p_head->next == NULL) && (input != 'q')){
+            printf("■:This is the last element of the list.\n");
+        }
+        
+        getchar();
+        printf("INPUT: w:Page down s:Page up q:Quit\n");
+        printf("INPUT: ");
+        input = getchar();
+        
+        if (input == 'q'){
+            ifnot = 0;
+        }
+    }
+    
+    printf("Done,any key to continue...\n");
+    getchar();getchar();
+    return 0;
+}
+
+void passwd_set (void){
+    CLEAR    printf("Please enter the administrator password: ");
+    char o_passwd[12];
+    scanf("%s",o_passwd);
+    FILE *fp = fopen("passwd.db","r");
+    char r_passwd[12];
+    fscanf(fp,"%s",r_passwd);
+    fclose(fp);
+    if(strcmp(o_passwd, r_passwd) == 0 ){
+        int ifnot = 1;
+        while (ifnot) {
+            printf("Input the new password: ");
+            char n_passwd[12];
+            scanf("%s",n_passwd);
+            printf("Input the new password again: ");
+            char n2_passwd[12];
+            scanf("%s",n2_passwd);
+            if(strcmp(n2_passwd, n_passwd) == 0){
+                fp = fopen("passwd.db", "w");
+                fprintf(fp,"%s",n_passwd);
+                fclose(fp);
+                ifnot = 0;
+                printf("Done,any key to continue...");
+                getchar();getchar();
+                CLEAR            }
+            else{
+                printf("Not the same!(Any key to continue...)");
+                getchar();getchar();
+                CLEAR            }
+
+        }
+    }
+    else{
+        printf("Wrong!(Any key to continue...)");
+        getchar();getchar();
+        CLEAR    }
+    
+}
+
+
+int delete_data_menu (void){
+    CLEAR    char *DELETE_MENU[5]={
+        "             Delete From",
+        "1.Name",
+        "2.Class",
+        "3.Year",
+        "4.Number"
+    };
+    
+    start_printf(5, DELETE_MENU);
+    int ifnot = 1;
+    stuc *head, *s_head;
+    while (ifnot){
+        char choices = choice("Choose the number (q to quit): ");
+        switch(choices){
+            case '1':
+                head = search_info_read();
+                s_head = search_info_name(head);
+                delete_info_printf(s_head, head);
+                ifnot = 0;
+                break;
+            case '2':
+                head = search_info_read();
+                s_head = search_info_class(head);
+                delete_info_printf(s_head, head);
+                ifnot = 0;
+                break;
+            case '3':
+                head = search_info_read();
+                s_head = search_info_year(head);
+                delete_info_printf(s_head, head);
+                ifnot = 0;
+                break;
+            case '4':
+                head = search_info_read();
+                s_head = search_info_number(head);
+                delete_info_printf(s_head, head);
+                ifnot = 0;
+                break;
+            case 'q':
+                ifnot = 0;
+                break;
+            default:
+                printf("Wrong,please try again!\n");
+                break;
+        }
+    }
+    return 0;
+}
+
+//PRINTF THE RESULT OF THE SEARCH
+int delete_info_printf(stuc *head, stuc *r_head){
+    if(head == NULL){
+        char *PRINTF_MENU[5] = {
+            "                 Not Found",
+        };
+        start_printf(1, PRINTF_MENU);
+        printf("Done!(Any key to continue...)");
+        getchar();getchar();
+        CLEAR        return 0;
+    }
+    stuc *p_head = head;
+    int count = 1;
+    struct _students *p_head_s = &p_head->stu_info;
+    int ifnot = 1;
+    char input = 'e';
+    while (ifnot){
+        int e_ifnot = 0;
+        if ((input == 'w') && (p_head != NULL)){
+            CLEAR            if (p_head->next != NULL){
+                count++;
+                p_head = p_head->next;
+                p_head_s = &p_head->stu_info;
+            }
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("[ %d ]", count);
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("\n");
+            printf("NAME: %s\n",p_head_s->name);
+            printf("CLASS: %s\n",p_head_s->class);
+            printf("YEAR: %s\n",p_head_s->year);
+            printf("NUMBER: %s\n",p_head_s->number);
+            for (int i = 0; i < WEIGHT_LENGTH_SQUARE-7; i++ ) printf("■");
+            printf("\n");
+        }
+        else if ((input == 's') && (p_head != NULL)){
+            CLEAR            if (p_head->front != NULL){
+                p_head = p_head->front;
+                p_head_s = &p_head->stu_info;
+                count--;
+            }
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("[ %d ]", count);
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("\n");
+            printf("NAME: %s\n",p_head_s->name);
+            printf("CLASS: %s\n",p_head_s->class);
+            printf("YEAR: %s\n",p_head_s->year);
+            printf("NUMBER: %s\n",p_head_s->number);
+            for (int i = 0; i < WEIGHT_LENGTH_SQUARE-7; i++ ) printf("■");
+            printf("\n");
+        }
+        else if ((input == 'e') && (p_head != NULL)){
+            p_head_s = &p_head->stu_info;
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("[ %d ]", count);
+            for (int i = 0; i < 20-(count % 10); i++ ) printf("■");
+            printf("\n");
+            printf("NAME: %s\n",p_head_s->name);
+            printf("CLASS: %s\n",p_head_s->class);
+            printf("YEAR: %s\n",p_head_s->year);
+            printf("NUMBER: %s\n",p_head_s->number);
+            for (int i = 0; i < WEIGHT_LENGTH_SQUARE-7; i++ ) printf("■");
+            printf("\n");
+        }
+        else if (input == 'd'){
+            stuc *p_front, *p_next, *pr_head = r_head;
+            struct _students  *r_head_s;
+            while(pr_head != NULL){
+                r_head_s = &pr_head->stu_info;
+                if (strcmp(r_head_s->number, p_head_s->number) == 0) {
+                    p_front = pr_head->front;
+                    p_next = pr_head->next;
+                    if (p_front != NULL){
+                        p_front->next = p_next;
+                    }
+                    if (p_next != NULL){
+                        p_next->front = p_front;
+                    }
+                    if (p_front == NULL){
+                        pr_head = p_next;
+                        r_head = pr_head;
+                    }
+                    pr_head = NULL;
+                }
+                else{
+                    pr_head = pr_head->next;
+                }
+            }
+            if (p_head != NULL){
+                p_front = p_head -> front;
+                p_next = p_head -> next;
+                if (p_front != NULL){
+                    p_front->next = p_next;
+                }
+                if (p_next != NULL){
+                    p_next->front = p_front;
+                }
+                if (p_next == NULL){
+                    p_head = p_front;
+                    count--;
+                }
+                else if(p_front == NULL){
+                    p_head = p_next;
+                    count++;
+                }
+                else if((p_front == NULL) && (p_next == NULL)){
+                    p_head = NULL;
+                }
+                else{
+                    p_head = p_head -> next;
+                }
+                e_ifnot = 1;
+            }
+        }
+        else{
+            
+        }
+        
+        if ((e_ifnot == 0) && (p_head != NULL)) {
+            if ((p_head->front == NULL) && (input != 'q')){
+                printf("■:This is the first element in the list.\n");
+            }
+            if ((p_head->next == NULL) && (input != 'q')){
+                printf("■:This is the last element of the list.\n");
+            }
+            getchar();
+            printf("INPUT: w:Page down s:Page up d:delete q:Quit\n");
+            printf("INPUT: ");
+            input = getchar();
+        }
+        if ((e_ifnot == 1) && (p_head != NULL)){
+            input = 'e';
+            CLEAR        }
+        
+        if (input == 'q' ){
+            ifnot = 0;
+        }
+        
+        if(p_head == NULL){
+            char *PRINTF_MENU[5] = {
+                "                 Not Found",
+            };
+            start_printf(1, PRINTF_MENU);
+            break;
+        }
+    }
+    FILE *fp = fopen("stuinfo.db", "w");
+    if (fp == NULL) {
+        printf("ERROR IN OPEN FILE!");
+        return -1;
+    }
+    stuc *prf_head = r_head;
+    struct _students  *rf_head_s;
+    while (prf_head != NULL){
+        rf_head_s = &prf_head->stu_info;
+        fprintf(fp, "%s\n", rf_head_s->name);
+        fprintf(fp, "%s\n", rf_head_s->class);
+        fprintf(fp, "%s\n", rf_head_s->year);
+        fprintf(fp, "%s\n", rf_head_s->number);
+        prf_head = prf_head->next;
+    }
+    
+    printf("Done,any key to continue...\n");
+    fclose(fp);
+    getchar();getchar();
+    return 0;
+}
+//End of program