c语言写出请输入功能序列一 查询余额二取款三存款是退卡

在C语言中编写这个简单的命令行交互程序，我们可以使用结构体、循环以及switch-case语句来实现输入选择的功能。下面是一个基本的示例：

#include <stdio.h>

typedef enum {
    ACTION_QUERY_BALANCE,
    ACTION_WITHDRAW,
    ACTION_DEPOSIT,
    ACTION_EXIT
} TransactionAction;

struct Account {
    float balance;
};

void query_balance(struct Account *account) {
    printf("查询余额: %.2f\n", account->balance);
}

void withdraw(struct Account *account, float amount) {
    if (amount <= account->balance) {
        account->balance -= amount;
        printf("取款成功, 新余额: %.2f\n", account->balance);
    } else {
        printf("余额不足, 取款失败\n");
    }
}

void deposit(struct Account *account, float amount) {
    account->balance += amount;
    printf("存款成功, 新余额: %.2f\n", account->balance);
}

int main() {
    struct Account acc = {0.0};
    int choice;
    
    while (1) {
        printf("\n请选择操作：\n"
               "1. 查询余额\n"
               "2. 取款\n"
               "3. 存款\n"
               "4. 退出\n"
               "> ");
        scanf("%d", &choice);

        switch (choice) {
            case ACTION_QUERY_BALANCE:
                query_balance(&acc);
                break;
            case ACTION_WITHDRAW:
                float withdrawal_amount;
                printf("请输入取款金额: ");
                scanf("%f", &withdrawal_amount);
                withdraw(&acc, withdrawal_amount);
                break;
            case ACTION_DEPOSIT:
                float deposit_amount;
                printf("请输入存款金额: ");
                scanf("%f", &deposit_amount);
                deposit(&acc, deposit_amount);
                break;
            case ACTION_EXIT:
                printf("感谢使用，再见!\n");
                return 0;
            default:
                printf("无效的选择，请重新输入。\n");
        }
    }

    return 0;
}