I want to turn a percentage value string to double?

Question

I have a percentage string in c# and want to return it into a double value.

for example . . .

string p = "6%";

Now I want to turn this string into

double value = 0.06;

How can I so that? I tried to use Math.Round() and put -2 in the digits to be rounded but it only allows numbers 0-15.

I am glad for any help you could offer.

Possible duplicate of [How to convert percentage string to double?](https://stackoverflow.com/questions/2171615/how-to-convert-percentage-string-to-double) — Andrey Belykh, May 18 '18 at 16:53

score 5 · Accepted Answer · answered Oct 18 '12 at 12:21

5

Maybe something like:

double value = double.Parse(p.TrimEnd(new[] {'%'}))/100;

answered Oct 18 '12 at 12:21

Zaranitos

Adil · Answer 2 · 2012-10-18T12:23:46.003

2

You can using split and cast it to double

double value = double.Parse(p.Split(new char[]{'%'})[0]) / 100;

edited Oct 18 '12 at 12:23

answered Oct 18 '12 at 12:16

Adil

1

You cannot _cast_ a string to a double. – H H Oct 18 '12 at 12:17
1

But you apparently _can_ get upvotes by saying you can cast a string to a double. – Rawling Oct 18 '12 at 12:18
double value = double.Parse( p.Split('%')[0] ) / 100; – kenny Oct 18 '12 at 12:19

score 1 · Answer 3 · answered Oct 18 '12 at 12:18

1

   double value = double.Parse(p.Trim().Split('%')[0]) / 100;

answered Oct 18 '12 at 12:18

H H

1

+1 Well, I would use Double.Parse(p.TrimRight(' ', '%')) to do _little bit_ more error checking (or "6%abc" may be considered valid) but it works! – Adriano Repetti Oct 18 '12 at 12:21

score 0 · Answer 4 · answered Oct 18 '12 at 12:18

0

string p = "6%";
string p2 = p.Remove(p.Length - 1);
double value = Convert.ToDouble(p2) / 100;

answered Oct 18 '12 at 12:18

Liam

Careful, this will result in integer division. – Rawling Oct 18 '12 at 12:19
1

Almost. Your division will yield `0`. `6 / 100 == 0`, `6 / 100.0 == 0.06` – H H Oct 18 '12 at 12:19
1

I think casting the p2 into a double will sort this? – Liam Oct 18 '12 at 12:21
Yes, but it was ToInt32 in the 1st revision. – H H Oct 18 '12 at 12:24

4 Answers4