How do I have a variable determine how many decimal points to display? c#

Question

I want to have the user say how many decimal points they want to display, I am trying to use format specifiers like {0:F2} but when I try something like

Console.WriteLine("{0} added to {1} is {2:F{3}}", Num1, Num2, Answer, DP);

it doesn't work, how do I do it?

Answer 1

Try .ToString(string Format):

Console.WriteLine("{0} added to {1} is {2}", Num1, Num2, Answer.ToString("F" + DP));

This will pass "F" + DP for the format provider. So, if DP = 2, then it would write the Answer as Answer.ToString("F2") (2 decimal places).