将双精度格式设置为两位小数 [英] Formatting a double to two decimal places

问题描述

我一直在尝试将打印出来的答案精确到小数点后两位.所涉及的所有数学运算都必须保持小数点后两位的格式.我已经尝试了一些事情，但我不确定要进行哪些更改才能使这项工作正常进行.

I have been trying to make the answer this prints out to be to two decimal places. All the math involved has to stay at that format of two decimal places. I have tried a few things and I am not sure what to change to make this work.

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+"");

推荐答案

string.Format 不会改变原来的值，但是会返回一个格式化的字符串.例如:

string.Format will not change the original value, but it will return a formatted string. For example:

Console.WriteLine("Earnings this week: {0:0.00}", answer);

注意:Console.WriteLine 允许内联字符串格式.以上等价于:

Note: Console.WriteLine allows inline string formatting. The above is equivalent to:

Console.WriteLine("Earnings this week: " + string.Format("{0:0.00}", answer));

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