用c语言编写一个银行账户管理系统，允许用户执行以下操作： [1]存款：用户输入存款金额，更新账户余额。 [2]取款：用户输入取款金额，如果余额不足，则提示“余额不足”，否则扣减账户余额。 [3]查询余额：输出当前账户余额。

在C语言中创建一个简单的银行账户管理系统，你可以使用结构体来表示账户信息，并通过函数来处理用户的操作。首先，我们定义一个`Account`结构体：

typedef struct {
    float balance;
} Account;

// 定义函数来处理用户操作
void deposit(Account *account, float amount) {
    account->balance += amount;
    printf("Deposit successful. New balance is %.2f.\n", account->balance);
}

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

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

接下来，你可以设计一个主程序，用于接收用户的命令并调用相应的函数：

int main() {
    Account account = {0}; // 初始余额为0
    char command[50];
    
    while (1) {
        printf("\nChoose an operation:\n1. Deposit\n2. Withdraw\n3. Check Balance\n4. Exit\n");
        scanf("%s", command);

        if (strcmp(command, "Exit") == 0)
            break;

        switch (command[0]) {
            case '1':
                float deposit_amount;
                printf("Enter deposit amount: ");
                scanf("%f", &deposit_amount);
                deposit(&account, deposit_amount);
                break;
            case '2':
                float withdraw_amount;
                printf("Enter withdrawal amount: ");
                scanf("%f", &withdraw_amount);
                withdraw(&account, withdraw_amount);
                break;
            case '3':
                check_balance(&account);
                break;
            default:
                printf("Invalid command. Please try again.\n");
                break;
        }
    }

    return 0;
}