c语言全功能ATM机代码

以下是一个更完整的C语言ATM机代码示例，包括了更多的功能和用户验证：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_ACCOUNTS 10
#define MAX_NAME_LENGTH 50
#define PIN_LENGTH 4

typedef struct {
    char name[MAX_NAME_LENGTH];
    int accountNumber;
    int balance;
    char pin[PIN_LENGTH+1];
} Account;

Account accounts[MAX_ACCOUNTS];
int numAccounts = 0;

int loadAccounts() {
    FILE* fp = fopen("accounts.txt", "r");
    if (!fp) {
        printf("Error: could not open accounts file.\n");
        return 0;
    }

    char line[100];
    while (fgets(line, sizeof(line), fp)) {
        char* name = strtok(line, ",");
        char* accountNumberStr = strtok(NULL, ",");
        char* balanceStr = strtok(NULL, ",");
        char* pin = strtok(NULL, ",");

        Account account;
        strncpy(account.name, name, MAX_NAME_LENGTH);
        account.accountNumber = atoi(accountNumberStr);
        account.balance = atoi(balanceStr);
        strncpy(account.pin, pin, PIN_LENGTH+1);

        accounts[numAccounts++] = account;
    }

    fclose(fp);
    return 1;
}

int saveAccounts() {
    FILE* fp = fopen("accounts.txt", "w");
    if (!fp) {
        printf("Error: could not open accounts file.\n");
        return 0;
    }

    for (int i = 0; i < numAccounts; i++) {
        fprintf(fp, "%s,%d,%d,%s\n", accounts[i].name, accounts[i].accountNumber, accounts[i].balance, accounts[i].pin);
    }

    fclose(fp);
    return 1;
}

Account* getAccountByNumber(int accountNumber) {
    for (int i = 0; i < numAccounts; i++) {
        if (accounts[i].accountNumber == accountNumber) {
            return &accounts[i];
        }
    }
    return NULL;
}

void printAccount(Account* account) {
    printf("Name: %s\n", account->name);
    printf("Account Number: %d\n", account->accountNumber);
    printf("Balance: %d\n", account->balance);
}

int authenticate(Account* account) {
    char pin[PIN_LENGTH+1];
    printf("Enter your PIN: ");
    scanf("%s", pin);

    if (strcmp(pin, account->pin) == 0) {
        printf("Authentication successful.\n");
        return 1;
    } else {
        printf("Authentication failed. Incorrect PIN.\n");
        return 0;
    }
}

void checkBalance(Account* account) {
    printf("Your balance is %d\n", account->balance);
}

void deposit(Account* account) {
    int amount;
    printf("Enter the amount to deposit: ");
    scanf("%d", &amount);
    account->balance += amount;
    printf("Deposit successful. Your new balance is %d\n", account->balance);
}

void withdraw(Account* account) {
    int amount;
    printf("Enter the amount to withdraw: ");
    scanf("%d", &amount);
    if (amount > account->balance) {
        printf("Withdrawal failed. Insufficient balance.\n");
    } else {
        account->balance -= amount;
        printf("Withdrawal successful. Your new balance is %d\n", account->balance);
    }
}

void transfer(Account* account) {
    int targetAccountNumber, amount;
    printf("Enter the target account number: ");
    scanf("%d", &targetAccountNumber);

    Account* targetAccount = getAccountByNumber(targetAccountNumber);
    if (!targetAccount) {
        printf("Transfer failed. Target account not found.\n");
        return;
    }

    printf("Enter the amount to transfer: ");
    scanf("%d", &amount);

    if (amount > account->balance) {
        printf("Transfer failed. Insufficient balance.\n");
    } else {
        account->balance -= amount;
        targetAccount->balance += amount;
        printf("Transfer successful. Your new balance is %d\n", account->balance);
    }
}

void changePin(Account* account) {
    char newPin[PIN_LENGTH+1];
    printf("Enter your new PIN: ");
    scanf("%s", newPin);

    strncpy(account->pin, newPin, PIN_LENGTH+1);
    printf("PIN changed successfully.\n");
}

int main() {
    if (!loadAccounts()) {
        return 1;
    }

    int option, accountNumber;

    while (1) {
        printf("Welcome to the ATM machine!\n");
        printf("Please enter your account number (or -1 to exit): ");
        scanf("%d", &accountNumber);

        if (accountNumber == -1) {
            break;
        }

        Account* account = getAccountByNumber(accountNumber);
        if (!account) {
            printf("Account not found.\n");
            continue;
        }

        if (!authenticate(account)) {
            continue;
        }

        while (1) {
            printf("Please select an option:\n");
            printf("1. Check Balance\n");
            printf("2. Deposit\n");
            printf("3. Withdraw\n");
            printf("4. Transfer\n");
            printf("5. Change PIN\n");
            printf("6. Exit\n");
            scanf("%d", &option);

            switch(option) {
                case 1:
                    checkBalance(account);
                    break;
                case 2:
                    deposit(account);
                    break;
                case 3:
                    withdraw(account);
                    break;
                case 4:
                    transfer(account);
                    break;
                case 5:
                    changePin(account);
                    break;
                case 6:
                    printf("Thank you for using the ATM machine!\n");
                    saveAccounts();
                    return 0;
                default:
                    printf("Invalid option. Please try again.\n");
            }
        }
    }

    return 0;
}

该代码使用了结构体来存储账户信息，并将其保存在accounts.txt文件中。代码中包括了更多的功能，如转账和更改PIN码。在每次用户验证和交易后，代码会将账户信息保存回文件中。