Jumlah means total in English. My problem here if I run this program and run case number 2 which one run for see the data content. But if I run this program like being skipped. like in this picture 
I already check all specifier format in scanf. But no one works. Oh content of file is already exist. in here I add the content use case 1.
This is my code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
// define book
#define MAX_TITLE_BOOK 75
#define MAX_AUTHOR 75
#define MAX_CATEGORY 75
#define MAX_SIZE_BOOK 75
//define book
//define data
#define MAX_NAME_STUDENTS 25
//define data
//struct
typedef struct
{
char titleBook[MAX_TITLE_BOOK];
char authorBook[MAX_AUTHOR];
char categoryBook[MAX_CATEGORY];
int codeBook;
}Book;
typedef struct
{
char name[MAX_NAME_STUDENTS];
int id;
int codeBook;
int dateBorrow[3];
int dateReturn[3];
}Borrow;
//struct
void add(Book x[],int total){ // add (1)
for(int i = 0; i < total; i++){
fflush(stdin);
printf("Masukan Judul Buku ke-%d: ", i + 1);
scanf("%[^\n]s", x[i].titleBook);
fflush(stdin);
printf("Masukan Penulis Buku: ");
scanf("%[^\n]s", x[i].authorBook);
fflush(stdin);
printf("Masukan Kategori Buku: ");
scanf("%[^\n]s", x[i].categoryBook);
fflush(stdin);
printf("Masukan Kode Buku: ");
scanf("%d", &x[i].codeBook);
}
}
void see_data(Book* x, int* total) {
FILE* file = fopen("data-book.txt", "a");
if (file == NULL) {
printf("No data found!!\n");
return;
}
*total = 0;
while(fscanf(file, "%s, %s, %s, %d", x[*total].titleBook, x[*total].authorBook, x[*total].categoryBook, &x[*total].codeBook) == 4) {
(*total)++;
}
fclose(file);
}
void output_see(Book x[], int y){
for(int i = 0; i < y; i++){
printf("Nomor: %d\n", i+1);
printf("Title: %s\n", x[i].titleBook);
printf("Author: %s\n", x[i].authorBook);
printf("Category: %s\n", x[i].categoryBook);
printf("Code: %d\n", x[i].codeBook);
}
}
void save(Book* x, int total){ // save(3) = save data yang diinput kedalam data-book.txt
FILE* file = fopen("data-book.txt", "a");
if(file == NULL){
printf("Can not see the contents of the data");
}
for(int i = 0; i < total; i++){
fprintf(file, "%s, %s, %s, %d\n", x[i].titleBook, x[i].authorBook, x[i].categoryBook, x[i].codeBook);
}
fclose(file);
printf("\nData saved successfully to database");
}
void change(Book x[], int y){
int index_data;
fflush(stdin);
printf("Enter the data number you want to change: ");
scanf("%d", &index_data);
fflush(stdin);
// ganti data
printf("Masukan Judul baru:");
scanf("%[^\n]s", x[index_data - 1].titleBook);
fflush(stdin);
printf("Masukan Author buku baru:");
scanf("%[^\n]s", x[index_data - 1].authorBook);
fflush(stdin);
printf("Masukan Category buku baru:");
scanf("%[^\n]s", x[index_data - 1].categoryBook);
fflush(stdin);
printf("Masukan Kode buku baru:");
scanf("%d", &x[index_data - 1].codeBook);
fflush(stdin);
}
int main (){
//declare
char password[25] = "admin", username[25] = "admin";
char checkPass[25], checkUser[25], back_menu, contentFile[100];
Book data[100];
FILE* file;
int menu_program, jumlah, limit = 0;
//declare
do{
printf("Input Username: ");
scanf("%s", checkUser);
printf("\nInput Password: ");
scanf("%s", checkPass);
if(strcmp(checkUser, username) == 0 && strcmp(checkPass, password) == 0){
printf("\tSuccessful Login!\n");
break;
}else{
printf("Password or Username wrong!\n");
}
limit++;
}while(limit < 3);
if(limit > 3){
printf("\nToo many request, please try again in 30 sec!");
}
do{
if(limit < 3){
printf("\n\t================================================");
printf("\n\tLibrary System Institut Teknologi Telkom Surabaya");
printf("\n\t================================================");
printf("\n\t1. Add Data");
printf("\n\t2. Read Data");
printf("\n\t3. Change/Update Data");
printf("\n\t4. Search Data");
printf("\n\t5. Sort Data");
printf("\n\t6. Book Borrow");
printf("\n\t7. Return Book");
printf("\n\t0. Exit");
printf("\n\tInput Menu: ");
scanf("%d", &menu_program);
}
switch (menu_program){
case 1:
printf("\nHow many books will be input: ");
scanf("%d", &jumlah);
fflush(stdin);
add(data, jumlah);
save(data, jumlah);
break;
case 2:
see_data(data, &jumlah);
output_see(data, jumlah);
break;
case 3:
file = fopen("data-book.txt", "w");
change(data, jumlah);
// simpen data
if(file == NULL){
printf("Failed to open file!");
}
for(int i = 0; i < jumlah; i++){
fprintf(file, "%s, %s, %s, %d\n", data[i].titleBook, data[i].authorBook, data[i].categoryBook, data[i].codeBook);
}
fclose(file);
break;
default:
break;
}
}while(menu_program != 0);
return 0;
}
I expect in terminal will show content of data (data-book.txt)
