Question

我有这个问题，我必须为学校的任务做。我有麻烦使它与小数一起工作。如果有人可以帮助我让程序接受小数。它将输出一个小数但它不会让我输入一个。

using System;

    public class Bank_Account
    {
        public static void Main()
        {
            char input, C, D, P, Q;
            double balance;

            Console.WriteLine("Please enter C for Cheque, D for Deposit, P for Print or Q to quit");
            input = Convert.ToChar(Console.ReadLine());
            do
            {
                switch (input)
                {
                    case 'D':
                        Deposit(ref balance);
                        break;
                    case 'P':
                        Print(balance);
                        break;
                    case 'C':
                        Cheque(ref balance);
                        break;
                    default:
                        Console.WriteLine("{0} is not a valid choice", input);
                        break;
                }
            } while (input != 'Q');

        }

        public static void Deposit(ref double balance)
        {
            double deposit;

            Console.WriteLine("Enter the amount you want to deposit: ");
            deposit = Convert.ToInt32(Console.ReadLine());

            if (deposit > 1000)
            {
                deposit = deposit*1.02;
            }
            else
            {
                deposit = deposit;
            }

            balance = +deposit;
        }


        public static void Cheque(ref double balance)
        {
            var tempBalance = balance;
            double deduction;
            const double fee = 1;


            do
            {
                Console.WriteLine("Enter the amount of the cheque: ");
                deduction = Convert.ToInt32(Console.ReadLine());
            } while (deduction < 0);


            tempBalance = balance - deduction - fee;
            if (tempBalance < 0)
            {
                Console.Write("Not enough money in the account");
            }
            else
            {
                balance = tempBalance;
            }
        }


        public static void Print(double balance)
        {
            Console.WriteLine("Your current balance is {0.00}", balance);
        }
    }

Answer 1

您正在转换为Int，更改为

        do
        {
            Console.WriteLine("Enter the amount of the cheque: ");
            deduction = Convert.ToDouble(Console.ReadLine());
        }

Answer 2

改变这个：

deposit = Convert.ToInt32(Console.ReadLine());

为：

deposit = Convert.ToDouble(Console.ReadLine());

因为你不是在读一个int，而是一个double。使用另一个答案中建议的TryParse会更好。另外，也许你应该使用decimal，如果你需要准确的话，不要加倍，但如果精确度不那么重要，那就加倍。

Answer 3

试试这个：

double deposit;
double.TryParse(Console.ReadLine(),out deposit);

Answer 4

deposit = Double.Parse(Console.ReadLine());

如何让此程序允许输入小数？

4 个答案: