我一直试图将打印出来的答案保留到小数点后两位。所有涉及的数学都必须保持两位小数的格式。我已经尝试了一些事情，但我不确定要改变什么才能使这项工作正常进行。
double pdt1 = 239.99;
double pdt1Total;
double pdt2 = 129.75;
double pdt2Total;
double pdt3 = 99.95;
double pdt3Total;
double pdt4 = 350.89;
double pdt4Total;
double wage = 200;
double percentage = 9;
double total;
double answer;
double i = 100;
double a;
double b;
double c;
double d;
Console.Write("Enter number sold of product #1: ");
a = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter number sold of product #2: ");
b = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter number sold of product #3: ");
c = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter number sold of product #4: ");
d = Convert.ToInt32(Console.ReadLine());
pdt1Total = a * pdt1;
pdt2Total = b * pdt2;
pdt3Total = c * pdt3;
pdt4Total = d * pdt4;
total = (pdt1Total + pdt2Total + pdt3Total + pdt4Total);
string.Format("{0:0.00}", total);
string.Format("{0:0.00}", answer = (total * percentage / i) + wage);
Console.WriteLine("Earnings this week: "+answer+"");
好吧，根据您的需要，您可以选择以下任何一项。输出是针对每种方法编写的
您可以选择您需要的
这将圆
decimal d = 2.5789m;
Console.WriteLine(d.ToString("#.##")); // 2.58
这将确保写入 2 位小数。
d = 2.5m;
Console.WriteLine(d.ToString("F")); //2.50
如果你想写逗号，你可以使用这个
d=23545789.5432m;
Console.WriteLine(d.ToString("n2")); //23,545,789.54
如果你想返回四舍五入的小数值，你可以这样做
d = 2.578m;
d = decimal.Round(d, 2, MidpointRounding.AwayFromZero); //2.58
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