【发布时间】：2018-12-07 15:43:43
【问题描述】：
我正在处理这个电影院预订项目！我在这里面临的两个问题是数据保存。
1)：当我关闭程序并尝试注册新用户时，以前注册用户的登录信息会被删除即使我以“a+”模式打开文件。但是如果我直接使用已经注册的用户登录它就可以了。问题是我一次不能注册超过 1 个用户。
2) : 当我关闭程序并再次登录时，用户预订信息将被删除。我也想保存用户的预订信息。
我该如何解决这个问题？
struct login
{
char fname[100];
char lname[100];
char username[20];
char password[20];
};
#include <stdio.h>
#define RVALUE 5
#define CVALUE 10
int i, j;
void DisplaySeats(void);
void ReserveSeats(void);
void ChooseSeat(void);
void CancelSeat(void);
void CheckCancelSeat(void);
void menu(void);
int Seats[RVALUE][CVALUE];
void registration();
void login();
int main()
{
int c;
int choice, menu;
printf("Welcome to our small Cinema!!!\n");
printf("\n");
//DisplaySeats();
printf("\n1 : register!!!\n");
printf("2 : login!!!\n");
printf("3 : quit\n");
printf("Enter your choice : \n");
scanf("%d",&c);
switch (c)
{
case 1:
registration();
break;
case 2:
login();
break;
case 3:
printf("Thankyou for Choosing our small Cinema !! \n");
getch();
exit(1);
default :
system("CLS");
printf("Enter a valid number !!\n");
main();
}
getch();
}
void registration()
{
FILE *log;
log = fopen("login.txt", "a+");
struct login l;
printf("\nEnter first name : ");
scanf("%s", &l.fname);
printf("\nEnter last name : ");
scanf("%s", &l.lname);
printf("\nEnter your Username : ");
scanf("%s", &l.username);
printf("\nEnter your password : ");
scanf("%s", &l.password);
fwrite(&l, sizeof(l), 1, log);
fclose(log);
printf("\nYou are successfully registered!!");
printf("\nYour UserId is %s and your password is %s", l.username, l.password);
printf("\nNow login with your username and password!!");
printf("\nPress any key to continue ...");
getch();
system("CLS");
main();
}
void login()
{
char username[100];
char password[100];
FILE *log;
struct login l;
log = fopen("login.txt", "r");
if (log == NULL)
{
printf("FILE NOT FOUND!!!");
exit(1);
}
printf("\nUserID : ");
scanf("%s", &username);
printf("\nPassword : ");
scanf("%s", &password);
while (fread(&l, sizeof(l), 1, log));
{
if (strcmp(username, l.username) == 0 && strcmp(password, l.password)==0)
{
system("CLS");
printf("\nYou are successfully logged in !!\n");
menu();
}
else
{
printf("\nYour UserID or password is incorrect !!\n");
printf("Press any key to continue ...\n");
getch();
system("CLS");
login();
}
}
fclose(log);
}
void ChooseSeat(void)
{
int row, col,k;
printf("Which row do you want to choose? : ");
scanf("%d", &row);
printf("Which seat do you want to select? : ");
scanf("%d", &col);
if (row > RVALUE || col > CVALUE)
{
printf("Wrong Entry !! Try again\n");
ChooseSeat();
}
else if (Seats[row - 1][col - 1] != 0)
{
printf("Seat is already reserved try again !!\n");
ChooseSeat();
}
else
{
Seats[row - 1][col - 1] = 1;
printf("Congratulations!! Reservation Completed!!!\n");
DisplaySeats();
printf("\nPress any key to go to main menu!!");
getch();
system("CLS");
main();
}
}
void ReserveSeats(void)
{
int NoOfSeats,i;
printf("How many seats do you want to reserve?\n");
scanf("%d", &NoOfSeats);
DisplaySeats();
for (i = 1; i <= NoOfSeats; i++)
{
ChooseSeat();
}
}
void DisplaySeats(void)
{
printf("\t \t Seats\n");
printf("\t 1 2 3 4 5 6 7 8 9 10\n");
for (i = 0; i < RVALUE; i++)
{
printf("Rows %d : ", i + 1);
for (j = 0; j < CVALUE; j++)
printf("%d ", Seats[i][j]);
printf("\n");
}
printf("\n");
}
void CheckCancelSeat(void)
{
while (1)
{
for (i = 0; i < RVALUE; i++)
{
for (j = 0; j < CVALUE; j++)
{
if (Seats[i][j] == 0)
{
printf("There is no reserved seat available!!\n");
break;
}
else
{
CancelSeat();
}
break;
}
break;
}
system("CLS");
break;
}
}
void CancelSeat(void)
{
int r, c;
printf("\nWhich row do you want to cancell ? : ");
scanf("%d", &r);
printf("\nWhich column do you want to cancell ? : \n");
scanf("%d", &c);
if (Seats[r - 1][c - 1] != 0)
{
Seats[r - 1][c - 1] = 0;
printf("Your Seat is Cancelled !!\n");
system("CLS");
}
else
{
printf("Wrong Entry !!\n");
CancelSeat();
}
}
void menu(void)
{
int choice;
DisplaySeats();
printf("1 : reserve a seat\n");
printf("2 : cancell a seat\n");
printf("3 : Main Menu\n");
printf("Enter your choice : \n");
scanf("%d", &choice);
system("CLS");
switch (choice)
{
case 1:
ReserveSeats();
break;
case 2:
CheckCancelSeat();
break;
case 3:
main();
break;
default:
printf("Please enter a valid choice!!");
menu();
break;
}
}
【问题讨论】：
-
代码太多，请缩减为minimal reproducible example
-
@Jean-FrançoisFabre 我不确定在哪里添加解决方案，这就是我放置整个代码的原因
-
@Jean-FrançoisFabre 你能帮我吗？请这是我必须提交的项目。
标签： c structure file-handling saving-data