這是我的自動取款機代碼，但不知何故，當我按下數字鍵盤上的數字 2 時，我得到了我的else宣告，該數字沒有選擇。
Console.WriteLine("What is your name? ");
string userName = Console.ReadLine();
Console.WriteLine("You are: " userName);
Console.WriteLine("How much money do you have? ");
string Balance = Console.ReadLine();
float startBalance = float.Parse(Balance);
Console.WriteLine(userName ", your balance is " startBalance " EUR");
Console.WriteLine("Press 1 for WITHDRAWAL");
Console.WriteLine("Press 2 for DEPOSIT");
if (Console.ReadKey().Key == ConsoleKey.NumPad1)
{
Console.ReadLine();
Console.WriteLine("How much money do you wish to withdraw? ");
string Withdrawal = Console.ReadLine();
float wBalance = float.Parse(Withdrawal);
Console.WriteLine("Your new balance is " (startBalance - wBalance) " EUR");
Console.ReadLine();
Environment.Exit(0);
}
if (Console.ReadKey().Key == ConsoleKey.NumPad2)
{
Console.ReadLine();
Console.WriteLine("How much money do you wish to deposit? ");
string Deposit = Console.ReadLine();
float dBalance = float.Parse(Deposit);
Console.WriteLine("Your new balance is " (startBalance - dBalance) " EUR");
Console.ReadLine();
Environment.Exit(0);
}
else Console.WriteLine("There was no choice for this number");
uj5u.com熱心網友回復：
您有兩個單獨的ifs 和兩個單獨的Console.ReadKey().
相反，將該呼叫提取到一個變數中，并使用 if-else if-else 序列對其進行評估：
ConsoleKeyInfo.Key key = onsole.ReadKey().Key;
if (key == ConsoleKey.NumPad1)
{
Console.ReadLine();
Console.WriteLine("How much money do you wish to withdraw? ");
string Withdrawal = Console.ReadLine();
float wBalance = float.Parse(Withdrawal);
Console.WriteLine("Your new balance is " (startBalance - wBalance) " EUR");
Console.ReadLine();
Environment.Exit(0);
}
else if (key == ConsoleKey.NumPad2)
{
Console.ReadLine();
Console.WriteLine("How much money do you wish to deposit? ");
string Deposit = Console.ReadLine();
float dBalance = float.Parse(Deposit);
Console.WriteLine("Your new balance is " (startBalance - dBalance) " EUR");
Console.ReadLine();
Environment.Exit(0);
}
else
{
Console.WriteLine("There was no choice for this number");
}
uj5u.com熱心網友回復：
復制 粘貼是邪惡的：請注意減去（添加預期）存款
"Your new balance is " (startBalance - dBalance) " EUR"
是典型的復制 粘貼錯誤。
與其復制自己，不如提取一個方法：
private static float ReadFloat(string title) {
// keep asking user...
while (true) {
if (!string.IsNullOrWhiteSpace(title))
Console.WriteLine(title);
if (!float.TryParse(Console.ReadLine(), out float result))
Console.WriteLine("Syntax error. Please, try again.");
else if (result < 0)
Console.WriteLine("Negative sum is not allowed. Please, try again.");
else
return result; // ... until valid value is provided
}
}
然后使用它
...
Console.WriteLine("Press 1 for WITHDRAWAL");
Console.WriteLine("Press 2 for DEPOSIT");
// Ask user once - Console.ReadKey().Key - then operate with his/her choice
var choice = Console.ReadKey().Key;
// balance change (either negative - withdraw or positive - deposit)
float delta =
choice == ConsoleKey.NumPad1 ? -ReadFloat("How much money do you wish to withdraw?")
: choice == ConsoleKey.NumPad2 ? ReadFloat("How much money do you wish to deposit?")
: 0f;
if (delta != 0) {
Console.WriteLine($"Your new balance is {startBalance delta} EUR");
Console.ReadLine();
Environment.Exit(0);
}
else
Console.WriteLine("There was no choice for this number");
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