我一直在用 c# 在 VS 上進行貨幣轉換，我目前的挑戰是如何正確地將美元轉換為弗蘭克，將歐元轉換為英鎊到弗蘭克，但是當我運行程式時，一切似乎都正常，直到我輸入要轉換的金額在美元中它有效，當我嘗試使用其他貨幣時，它沒有顯示任何結果或引發任何例外。以下是我的程式，我嘗試尋找類似的挑戰，但找不到適合我的情況！我對 C# 語言和社區非常陌生，也許這可能不是一個非常聰明的問題，但我確實需要幫助！
class Program
{
public static void Main()
{
int ;
double val,frank;
Console.WriteLine("Enter your Choice :\n 1- Dollar to Frank \n 2- Euro to Frank \n 3- Sterling to Frank ");
choice = int.Parse(Console.ReadLine());
(choice)
{
case 1:
Double dollar;
Console.Write("Enter the Dollar Amount :");
dollar = Double.Parse(Console.ReadLine());
Console.Write("Enter the Dollar Value :");
val = double.Parse(Console.ReadLine());
frank = dollar * val;
Console.WriteLine("{0} Dollar Equals {1} Frank", dollar, frank);
break;
case 2:
Double Euro;
Console.Write("Enter the Euro Amount :");
Euro Double.Parse(Console.ReadLine());
Console.Write("Enter the Euro Value :");
val = double.Parse(Console.ReadLine());
frank = Euro * val;
Console.WriteLine("{0} Euro Equals {1} Frank", Euro, frank);
break;
case 3:
Double sterling;
Console.Write("Enter the Sterling Amount :");
Double.Parse(Console.ReadLine());
Console.Write("Enter the Sterling Value :");
val = double.Parse(Console.ReadLine());
frank = sterling * val;
Console.WriteLine("{0} Sterling Equals {1} Frank", sterling, frank);
break;
}
Console.ReadLine();
}
}
uj5u.com熱心網友回復：
我會嘗試以更通用的方式和更少的重復來解決這個問題。
public static void Main()
{
decimal EnterDecimal(string message, bool zero_allowed)
{
while (true)
{
Console.WriteLine(message);
if (decimal.TryParse(Console.ReadLine(), out decimal value))
if (zero_allowed || value != 0m)
return value;
}
}
string EnterCurrency(string message)
{
while (true)
{
Console.WriteLine(message);
string currency = Console.ReadLine().ToUpperInvariant();
if (currency.Length == 3)
return currency;
}
}
string currency_from = EnterCurrency("Enter From Currency");
string currency_to = EnterCurrency("Enter To Currency");
decimal rate = EnterDecimal($"Enter exchange rate from {currency_from} to {currency_to}", false);
decimal amount_from = EnterDecimal($"Enter the amount of {currency_from} to convert", true);
decimal amount_to = amount_from * rate;
Console.WriteLine($"{amount_from} {currency_from} equals {amount_to} {currency_to}");
}
此代碼的典型運行可能是：
Enter From Currency
AUD
Enter To Currency
USD
Enter exchange rate from AUD to USD
0.7
Enter the amount of AUD to convert
100
100 AUD equals 70.0 USD
uj5u.com熱心網友回復：
我不能 100% 確定這是否是您要求的，但下面的代碼適用于所選的 3 個中的任何一個。我試著讓它盡可能簡單，并且和你的代碼一樣。
internal class Promena
{
public static void Main()
{
decimal val, frank;
Console.WriteLine("Enter your choice :\n 1- Dollar to Frank \n 2- Euro to Frank \n 3- Sterling to Frank");
int choice = int.Parse(Console.ReadLine());
if(choice == 1 )
{
decimal dollar;
Console.WriteLine("Enter the Dollar amount : ");
dollar = int.Parse(Console.ReadLine());
Console.WriteLine("Enter the Dollar value:");
val = decimal.Parse(Console.ReadLine());
frank = dollar * val;
Console.WriteLine("Amount of " dollar " Dollars = " frank " Franks");
}
else if(choice == 2 )
{
decimal euro;
Console.WriteLine("Enter the Euro amount : ");
euro = int.Parse(Console.ReadLine());
Console.WriteLine("Enter the Dollar value:");
val = decimal.Parse(Console.ReadLine());
frank = euro * val;
Console.WriteLine("Amount of " euro " Euros = " frank " Franks");
}
else if(choice == 3 )
{
decimal sterling;
Console.WriteLine("Enter the Sterling amount : ");
sterling = int.Parse(Console.ReadLine());
Console.WriteLine("Enter the Dollar value:");
val = decimal.Parse(Console.ReadLine());
frank = sterling * val;
Console.WriteLine("Amount of " sterling " Euros = " frank " Franks");
}
}
}
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