How to use String.Format specifier in an expression?

Question

double paintneeded = area/450;

When I run the above, I get the output as 0.444444444, but I wanted only 0.44.

I tried this, but it throws an error:

double paintneeded = String.Format("{0:0.00}", (area/450));

Console.WriteLine("Number of Gallons paint needed:\t{0}", paintneeded);

How do I use String.Format in this expression? Or can I use it in the Console.WriteLine? If so, how do I implement it?

String.Format returns a string, which you're trying to assign to a double. — Jane S, May 18 '14 at 03:18
possible duplicate of [Using String Format to show decimal upto 2 places or simple integer](http://stackoverflow.com/questions/6951335/using-string-format-to-show-decimal-upto-2-places-or-simple-integer) — Itay, May 18 '14 at 03:21
Just to clarify: what do you want if the result is an exact value (no decimal)? — Joel Coehoorn, May 18 '14 at 03:31

score 2 · Accepted Answer · answered May 18 '14 at 03:29

2

Console.WriteLine("Number of Gallons paint needed:\t{0:F2}", area/450.0);

answered May 18 '14 at 03:29

Joel Coehoorn

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this was simple.. I made it so complicated Convert.ToDouble(string.Format("{0:0.00}", (area /450))); – user3648850 May 18 '14 at 06:22

score 0 · Answer 2 · answered May 18 '14 at 03:25

0

First way, convert to string:

double area = 150;
string paintneeded = string.Format("{0:0.00}", (area/450d)).ToString();

Console.WriteLine("Number of Gallons paint needed:\t{0}", paintneeded);

Second way, convert to double:

double area = 150;
double paintneeded = area/450d;

Console.WriteLine("Number of Gallons paint needed:\t{0:0.00}", paintneeded);

answered May 18 '14 at 03:25

Magistr_AVSH

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Thanks Magistr_AVSH I was able to figure it out, but now iam struggling to include thousands separator and the digits after decimal together in one – user3648850 May 18 '14 at 06:05
salestax = Convert.ToDouble(string.Format("{0:0,0.00}",((subtotal * 8.25) / 100))); //o/p should be 1,749.00 but I got it as 1749 also if I want to have the o/p as 100.00 what needs to be changed in the syntax?? – user3648850 May 18 '14 at 06:07
Why you convert string to double? Of course you are lose formatting. Do something like this double area = 15000.179; Console.WriteLine(area.ToString("N", CultureInfo.InvariantCulture)); [netfiddle](https://dotnetfiddle.net/fL1W4B) – Magistr_AVSH May 18 '14 at 06:21

How to use String.Format specifier in an expression?

2 Answers2