c语言编写一个简单ATM 使用循环语句和判断语句以及分支语句进行编写

在C语言中，我们可以创建一个简单的ATM模拟程序来演示基本的交互逻辑。这个程序通常包括存款、取款和查询余额等功能。这里是一个简化的例子：

#include <stdio.h>

typedef struct {
    float balance;
} Account;

void deposit(Account *account, float amount) {
    account->balance += amount;
    printf("Deposit successful! New balance: %.2f\n", account->balance);
}

void withdraw(Account *account, float amount) {
    if (amount <= account->balance) {
        account->balance -= amount;
        printf("Withdrawal successful! New balance: %.2f\n", account->balance);
    } else {
        printf("Insufficient balance.\n");
    }
}

void check_balance(Account *account) {
    printf("Current balance: %.2f\n", account->balance);
}

int main() {
    Account my_account = {0.0}; // 初始化余额为0

    int choice;
    while (1) {
        printf("\nATM Menu:\n1. Deposit\n2. Withdraw\n3. Check Balance\n4. Exit\n");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                float deposit_amount;
                printf("Enter deposit amount: ");
                scanf("%f", &deposit_amount);
                deposit(&my_account, deposit_amount);
                break;
            case 2:
                float withdraw_amount;
                printf("Enter withdrawal amount: ");
                scanf("%f", &withdraw_amount);
                withdraw(&my_account, withdraw_amount);
                break;
            case 3:
                check_balance(&my_account);
                break;
            case 4:
                printf("Thank you for using the ATM. Goodbye!\n");
                return 0; // 结束程序
            default:
                printf("Invalid option. Please try again.\n");
        }
    }

    return 0;
}

在这个示例中，我们定义了一个`Account`结构体，并通过`deposit`, `withdraw`, 和 `check_balance` 函数实现了基本功能。用户在主循环中选择操作，然后根据输入调用相应的函数。