我正在开发一个名为ATM的迷你项目作为冬季任务。我已经完成了ATM的编码，如下面的代码所示。但是我遇到了一个问题，因为假设我已经为用户创建了一个数据库并将其存储到文件中，但对于第一个用户，即第一个条目，我可以轻松读取数据但是对于文件中的第二个条目，我无法读取数据第一次尝试。在第一次尝试时，它显示错误Id和PIN，但在第二次进入时一切正常。同样的事情发生在列表中的第三个条目，即第三个用户。对于前两次尝试，它显示错误的ID和PIN，但在第三次尝试中，一切正常。对所有用户都是如此，即第四，等等。
这是我的代码：
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct user
{
int id;
char fname[20],lname[20];
long unsigned int acct_num, mobile;
int pin;
float balance;
};
void balance_enquiry();
void balance_withdraw();
void balance_deposit();
void account_creation();
void account_modify();
void account_auth_id();
void account_auth_pin();
char data[] = {"ATM.dat"};
int main()
{
int option;
G:printf("\nWelcome To The ATM Services:\n");
printf("\n****************************\n");
printf("\nPlease Choose Your Options:\n");
printf("\n");
printf("\n1. Banking Services:\n");
printf("\n2. Account Creation:\n");
printf("\n3. Account Modification:\n");
scanf("%d", &option);
switch (option)
{
case 1:
{
system("clear");
int choice;
account_auth_id();
account_auth_pin();
printf("\n********Welcome to ATM Service**************\n");
printf("\n1. Check Balance\n");
printf("\n2. Withdraw Cash\n");
printf("\n3. Deposit Cash\n");
printf("\n4. Quit\n");
printf("\n******************?**************************?*\n\n");
printf("\nEnter Your Choice: \n");
scanf("%d", &choice);
switch (choice)
{
case 1:
balance_enquiry();
break;
case 2:
balance_withdraw();
break;
case 3:
balance_deposit();
case 4:
printf("\nTHANK U FOR USING ATM \n");
break;
default:
printf("\nINVALID CHOICE:\n");
break;
}
break;
}
case 2:
account_creation();
break;
case 3:
account_modify();
break;
case 4:
printf("\nTHANK U FOR USING ATM \n");
break;
default:
printf("\nEnter Valid Choice:\n");
break;
}
char transaction;
printf("\nDO U WANT TO PERFORM ANOTHER TRANSCATION (y or n): \n");
scanf(" %c", &transaction);
if (transaction == 'y')
goto G;
printf("\nTHANKS FOR USING OUT ATM SERVICE:\n\n");
getch();
return 0;
}
void balance_enquiry()
{
FILE *fp;
struct user t;
int id, f = 0;
fp = fopen(data, "rb");
printf("\nEnter Your ID Number:\n");
D:scanf("%d", &id);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
break;
if (t.id == id)
{
f = 1;
printf("Your Current Balance Is: %f\n", t.balance);
}
if (f == 0)
{
printf("Please Enter valid ID:\n");
goto D;
}
}
fclose(fp);
}
void balance_withdraw()
{
FILE *fp,*fp1;
struct user t1;
int withdraw,id, f = 0;
fp = fopen("ATM.dat", "rb");
fp1 = fopen("temp.dat", "wb");
printf("\nEnter Your ID Number:\n");
scanf("%d", &id);
while (1)
{
fread(&t1, sizeof(struct user), 1, fp);
if (feof(fp))
break;
if (t1.id == id)
{
f = 1;
printf("\nENTER THE AMOUNT TO WITHDRAW: \n");
A:scanf("%d", &withdraw);
if (withdraw % 100 != 0)
{
printf("\nPLEASE ENTER THE AMOUNT IN MULTIPLES OF 100:\n");
goto A;
}
if (withdraw > t1.balance)
{
printf("\nINSUFFICENT BALANCE:\n");
printf("\nTRY WITH LESSER AMOUNT\n");
goto A;
if (withdraw <= t1.balance)
{
t1.balance = t1.balance - withdraw;
printf("\nPLEASE COLLECT CASH:\n\n");
printf("\nYOUR CURRENT BALANCE IS: %d", t1.balance);
fwrite(&t1, sizeof(struct user), 1, fp1);
}
else
fwrite(&t1, sizeof(struct user), 1, fp1);
}
}
fclose(fp);
fclose(fp1);
if (f == 0)
{
printf("Sorry, There Is Some Technical Problem:\n\n");
}
else
{
fp = fopen("ATM.dat", "wb");
fp1 = fopen("temp.dat", "rb");
while (1)
{
fread(&t1, sizeof(struct user), 1, fp1);
if (feof(fp1))
break;
fwrite(&t1, sizeof(struct user), 1, fp);
}
}
fclose(fp);
fclose(fp1);
}
}
void balance_deposit()
{
}
void account_auth_id()
{
FILE *fp;
struct user t;
int id, f = 0,k =0;
fp = fopen(data, "rb");
fflush(stdin);
A:printf("\nEnter Your ID Number:\n");
scanf("%d", &id);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
break;
if (t.id == id)
{
f = 1;
printf("Welcome, Mr %s\n", t.fname);
}
if (f == 0)
{
k++;
if(k == 3)
{
printf("You Have Reached Max. Attempts:\n");
getch();
return 0;
}
printf("You Have Entered Wrong ID:\n");
printf("Please Enter Valid ID:\n");
goto A;
}
}
}
void account_auth_pin()
{
FILE *fp;
struct user t;
int tmpPin,k = 0, f = 0;
fp = fopen(data, "rb");
fflush(stdin);
B:printf("Enter Your Secret Pin:\n");
scanf("%d", &tmpPin);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
break;
if (t.pin == tmpPin)
{
f = 1;
printf("Super!,Now You Can Enjoy Banking Services:\n");
}
if (f == 0)
{
k++;
if(k == 3)
{
printf("You Have Entered Three Times Wrong PIN:\n");
printf("Please,Try Again:\n");
getch();
return 0;
}
printf("You Have Entered Wrong PIN:\n");
printf("Please Enter Correct PIN:\n");
goto B;
}
}
}
void account_creation()
{
FILE *fp;
struct user t;
fp = fopen(data, "ab");
printf("Enter Your ID Number:\n");
scanf("%d", &t.id);
printf("\nEnter Your First Name:\n");
scanf("%s", &t.fname);
printf("\nEnter Your Last Name:\n");
scanf("%s", &t.lname);
printf("Enter Your New Account number:\n");
scanf("%lu", &t.acct_num);
printf("Enter Your Mobile Number:\n");
scanf("%lu", &t.mobile);
printf("Enter Your Secret PIN:\n");
scanf("%d", &t.pin);
printf("Enter The initial Amount To Deposit:\n");
scanf("%f", &t.balance);
fwrite(&t, sizeof(t), 1, fp);
fclose(fp);
}
void account_modify()
{
}
答案 0 :(得分：0)
最后，我的代码工作正常......现在一切都很好。 这是我对那些对此项目感兴趣或类似的人的代码。
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct user
{
int id;
char name[20];
char lname[20];
int acct_num;
int pin;
int balance;
};
void balance_enquiry();
void balance_withdraw();
void balance_deposit();
void account_creation();
void account_modify();
void account_del();
void displayAll();
char fname[] = { "atm.dat" };
int main()
{
while (1)
{
int ch;
printf("\n\t\tWelcome To The ATM Services:\n");
printf("\n\t\t****************************\n");
printf("\n\t\tPlease Choose Your Options:\n");
printf("\n");
printf("1. Balance Enquiry:\t\t4. Account creation:\n");
printf("2. Withdraw Money:\t\t5. Account Modification:\n");
printf("3. Deposit Money:\t\t6. Account Delete:\n\n");
printf("\t\tPress 0 For Exit:\n");
scanf("%d", &ch);
switch (ch)
{
case 1:
balance_enquiry();
break;
case 2:
balance_withdraw();
break;
case 3:
balance_deposit();
break;
case 4:
account_creation();
break;
case 5:
account_modify();
break;
case 6:
account_del();
break;
case 0:
return 0;
case 11://to see all details of customer in database.
displayAll();
break;
default:
printf("Enter Valid Options:\n");
}
}
return 0;
}
void balance_enquiry()
{
FILE *fp;
struct user t;
int id, tmpPin, found = 0;
fp = fopen(fname, "rb");
printf("\nEnter Your Customer ID:");
scanf("%d", &id);
printf("\nEnter Your Secret PIN:\n");
scanf("%d", &tmpPin);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
{
break;
}
if (t.id == id && t.pin == tmpPin)
{
found = 1;
printf("\n============================================\n\n");
printf("Welcome, Mr %s %s\n\n", t.name, t.lname);
printf("Account Number\t\t Balance\n\n");
printf("%d\t\t %d\n\n", t.acct_num, t.balance);
printf("==============================================\n\n");
}
}
if (found == 0)
{
printf("\nSorry You Have Entered Wrong Details:\n");
}
fclose(fp);
}
void balance_withdraw()
{
FILE *fp, *fp1;
struct user t;
int id, found = 0;
int withdraw, tmpPin;
fp = fopen(fname, "rb");
fp1 = fopen("temp.dat", "wb");
printf("\nEnter the Customer ID:\n");
scanf("%d", &id);
printf("Enter Your Secret PIN:\n");
scanf("%d", &tmpPin);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
{
break;
}
if (t.id == id && t.pin == tmpPin)
{
found = 1;
do
{
do
{
printf("\nEnter Amount To Withdraw:\n");
scanf("%d", &withdraw);
if (withdraw % 100 != 0)
{
printf("\nAmount Should Be Multiple Of 100:\n");
}
} while (withdraw % 100 != 0);
if (withdraw > t.balance)
{
printf("\n Insufficient Balance:\n");
printf("\nTry With Lesser Amount\n");
}
} while (withdraw > t.balance);
if (withdraw <= t.balance)
{
t.balance = t.balance - withdraw;
printf("\nPlease Collect Your Cash:\n\n");
printf("\nYour Current Balance Is: %d", t.balance);
fflush(stdin);
fwrite(&t, sizeof(t), 1, fp1);
}
}
else
{
fwrite(&t, sizeof(t), 1, fp1);
}
}
fclose(fp);
fclose(fp1);
if (found == 0)
{
printf("Sorry Try Again! Technical Problem:\n\n");
}
else
{
fp = fopen(fname, "wb");
fp1 = fopen("temp.dat", "rb");
while (1)
{
fread(&t, sizeof(t), 1, fp1);
if (feof(fp1))
{
break;
}
fwrite(&t, sizeof(t), 1, fp);
}
}
fclose(fp);
fclose(fp1);
}
void balance_deposit()
{
FILE *fp, *fp1;
struct user t;
int id, found = 0;
int deposit, tmpPin;
fp = fopen(fname, "rb");
fp1 = fopen("temp.dat", "wb");
printf("\nEnter the Customer ID:\n");
scanf("%d", &id);
printf("Enter Your Secret PIN:\n");
scanf("%d", &tmpPin);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
{
break;
}
if (t.id == id && t.pin == tmpPin)
{
found = 1;
do
{
printf("\nEnter Amount To Deposit:\n");
scanf("%d", &deposit);
if (deposit % 100 != 0)
{
printf("\nPLEASE Enter The Amount In Multiples Of 100:\n");
}
} while (deposit % 100 != 0);
t.balance = t.balance + deposit;
printf("\nYOUR CURRENT BALANCE IS: %d", t.balance);
fflush(stdin);
fwrite(&t, sizeof(t), 1, fp1);
}
else
{
fwrite(&t, sizeof(t), 1, fp1);
}
}
fclose(fp);
fclose(fp1);
if (found == 0)
{
printf("Sorry Try Again! Technical Problem:\n\n");
}
else
{
fp = fopen(fname, "wb");
fp1 = fopen("temp.dat", "rb");
while (1)
{
fread(&t, sizeof(t), 1, fp1);
if (feof(fp1))
{
break;
}
fwrite(&t, sizeof(t), 1, fp);
}
}
fclose(fp);
fclose(fp1);
}
void account_creation()
{
FILE *fp;
struct user t;
fp = fopen(fname, "ab");
printf("\t\tWelcome,First Time User\n\nPlease Enter Your Personal Details:\n\n");
printf("Enter Customer ID Number:\n");
scanf("%d", &t.id);
printf("Enter You First Name:\n");
scanf("%s", t.name);
printf("Enter Your Last Name:\n");
scanf("%s", t.lname);
printf("Enter Your New Account Number:\n");
scanf("%d", &t.acct_num);
printf("Enter Your Secret PIN:\n");
scanf("%d", &t.pin);
printf("Enter The Initial Amount:\n");
scanf("%d", &t.balance);
fwrite(&t, sizeof(struct user), 1, fp);
fclose(fp);
}
void account_modify()
{
FILE *fp, *fp1;
struct user t;
int id, found = 0;
int tmpPin, ch;
fp = fopen(fname, "rb");
fp1 = fopen("temp.dat", "wb");
printf("\nEnter the Customer ID you want to Modify:");
scanf("%d", &id);
printf("\nEnter the Secret PIN of Custmer ID = %d:\n", id);
scanf("%d", &tmpPin);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
{
break;
}
if (t.id == id && t.pin == tmpPin)
{
found = 1;
printf("Which Data You Want To Modify:\n");
printf("\t1. Custormer ID:\n");
printf("\t2. First Name:\n");
printf("\t3. Last Name:\n");
printf("\t4. Secret PIN:\n");
printf("Others are Not Allowed:\n");
scanf("%d", &ch);
switch (ch)
{
case 1:
printf("Enter New customer ID:");
scanf("%d", &t.id);
fflush(stdin);
break;
case 2:
printf("Enter New Customer First Name:\n");
scanf("%s", t.name);
break;
case 3:
printf("Enter New Customer Last Name:\n");
scanf("%s", t.lname);
break;
case 4:
printf("Enter Your New Secret PIN:\n");
scanf("%d", &t.pin);
break;
default:
printf("tEnter Valid Choice:\n");
break;
}
fwrite(&t, sizeof(t), 1, fp1);
}
else
{
fwrite(&t, sizeof(t), 1, fp1);
}
}
fclose(fp);
fclose(fp1);
if (found == 0)
{
printf("Sorry No Record Found\n\n");
}
else
{
fp = fopen(fname, "wb");
fp1 = fopen("temp.dat", "rb");
while (1)
{
fread(&t, sizeof(t), 1, fp1);
if (feof(fp1))
{
break;
}
fwrite(&t, sizeof(t), 1, fp);
}
}
fclose(fp);
fclose(fp1);
}
void account_del()
{
FILE *fp, *fp1;
struct user t;
int id, found = 0;
fp = fopen(fname, "rb");
fp1 = fopen("temp.dat", "wb");
printf("\nEnter the Customer ID you want to Delete:");
scanf("%d", &id);
while (1)
{
fread(&t, sizeof(t), 1, fp);
if (feof(fp))
{
break;
}
if (t.id == id)
{
found = 1;
}
else
{
fwrite(&t, sizeof(t), 1, fp1);
}
}
fclose(fp);
fclose(fp1);
if (found == 0)
{
printf("Sorry No Record Found\n\n");
}
else
{
fp = fopen(fname, "wb");
fp1 = fopen("temp.dat", "rb");
while (1)
{
fread(&t, sizeof(t), 1, fp1);
if (feof(fp1))
{
break;
}
fwrite(&t, sizeof(t), 1, fp);
}
}
fclose(fp);
fclose(fp1);
}
void displayAll()
{
FILE *fp;
struct user t;
fp = fopen(fname, "rb");
printf("\n========================================================\n\n");
printf("\t\t All Customer Details\n\n");
printf("=====================================================\n\n");
printf("ID\tFirst\tLast\tAccount Number\tPIN\tBalance\n\n");
while (1)
{
fread(&t, sizeof(struct user), 1, fp);
if (feof(fp))
{
break;
}
printf("%d\t", t.id);
printf("%s\t", t.name);
printf("%s\t", t.lname);
printf("%d\t", t.acct_num);
printf("%d\t", t.pin);
printf("%d\t\n\n", t.balance);
}
printf("=====================================================\n\n");
fclose(fp);
}