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[英]How do I make an console application run until the user enters “Q”, “q”, “Quit” or “quit” to terminate it?
[英]C# console app: How can I continue returning an error message until user enters valid data?
我正在建立一種計算運費的方法。 我已經將數據類型驗證為整數。 只要輸入的整數大於0,邏輯就可以正常工作。 當輸入的數字小於1時,將生成錯誤消息,並重復請求更大的整數。 好的,到目前為止。
但是,在錯誤消息要求輸入有效的整數后,輸入的數據將被忽略並且計算不正確。 如何重復請求,直到用戶輸入大於0的數字,然后使用該數字執行所需的計算? 謝謝!
static double CalculateShipping(int items, double shippingCharge)
{
if (items == 1)
shippingCharge = 2.99;
else if (items > 1 && items < 6)
shippingCharge = 2.99 + 1.99 * (items - 1);
else if (items > 5 && items < 15)
shippingCharge = 10.95 + 1.49 * (items - 5);
else if (items > 14)
shippingCharge = 24.36 + 0.99 * (items - 14);
else
{
Console.WriteLine("You must order at least 1 item.");
Console.WriteLine();
Console.Write("Please enter a whole number greater than zero: ");
items = Console.Read();
}
return shippingCharge;
}
在While
循環中包裝您的Console
語句。 就像是...
bool MyValidationFlag = false;
While MyValidationFlag == False
{
// Prompt User
If (UserInput is an integer > 1)
MyValidationFlag = True
else
MyValidationFlag = False
}
(您可能還想對“轉義”值進行某種檢查,以防用戶要退出。)
static int ReadItemsCountFromInput()
{
while(true)
{
Console.WriteLine("enter items count: ");
string s = Console.ReadLine();
int r;
if(int.TryParse(s, out r) && r > 0)
{
return r;
}
else
{
Console.WriteLine("you should enter number greater than zero");
}
}
}
static double CalculateShipping(int items, double shippingCharge)
{
if (items == 1)
shippingCharge = 2.99;
else if (items > 1 && items < 6)
shippingCharge = 2.99 + 1.99 * (items - 1);
else if (items > 5 && items < 15)
shippingCharge = 10.95 + 1.49 * (items - 5);
else if (items > 14)
shippingCharge = 24.36 + 0.99 * (items - 14);
return shippingCharge;
}
static void Main()
{
int items = ReadItemsCountFromInput();
double result = CalculateShipping(items, 0);
Console.WriteLine("Shipping: {0}", result);
}
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