确保输入有两位小数

本文关键字：两位小数输入确保 | 更新日期: 2023-09-27 18:12:17

Console.Write("Input price: ");
double price;
string inputPrice = Console.ReadLine();
if (double.TryParse(inputPrice, out price))
{
    price = double.Parse(inputPrice);
}
else
{
    Console.WriteLine("Inventory code is invalid!");
}

所以我必须确保输入的价格必须是小数点后两位。例如:

2.00 -正确
3.65 -修正
77.54 -正确
34.12 -正确

2 -错误
2.8 -错误
2.415 -错误
99.0 -错误

我该如何检查它?

确保输入有两位小数

试试这个:-

Console.Write("Input price: ");
double price;
string inputPrice = Console.ReadLine();
var num = Decimal.Parse(inputPrice); //Use tryParse here for safety
if (decimal.Round(num , 2) == num)
{
   //You pass condition
}
else
{
    Console.WriteLine("Inventory code is invalid!");
}

正则表达式检查:-

var regex = new Regex(@"^'d+'.'d{2}?$"); // ^'d+('.|',)'d{2}?$ use this incase your dec separator can be comma or decimal.
var flg = regex.IsMatch(inputPrice);
if(flg)
{
''its a pass
}
else
{
''failed
}

check inputPrice.Split('.')[1].Length == 2

更新:

Console.Write("Input price: ");
            double price;
            string inputPrice = Console.ReadLine();
            if (double.TryParse(inputPrice, out price) && inputPrice.Split('.').Length == 2 && inputPrice.Split('.')[1].Length == 2)
            {
                price = double.Parse(inputPrice);
            }
            else
            {
                Console.WriteLine("Inventory code is invalid!");
            }