Formatting a double to two decimal places

Question

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+""); 

Answer 1

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); 

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

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

Answer 2

Well, depending on your needs you can choose any of the following. Out put is written against each method

You can choose the one you need

This will round

decimal d = 2.5789m; Console.WriteLine(d.ToString("#.##")); // 2.58 

This will ensure that 2 decimal places are written.

d = 2.5m; Console.WriteLine(d.ToString("F")); //2.50 

if you want to write commas you can use this

d=23545789.5432m; Console.WriteLine(d.ToString("n2")); //23,545,789.54 

if you want to return the rounded of decimal value you can do this

d = 2.578m; d = decimal.Round(d, 2, MidpointRounding.AwayFromZero); //2.58