How do I turn 67 into float equivalent?

Question

I'm using a library where I need to set a value on a variable and it only accepts float type, but the TrackBar Control only accepts Int32 for its Value property.

So let's say that the Min value of TrackBar is 0 and Max value is 100. And the Current value of TrackBar is 67; how do I convert that value to its equivalent in float? So it should become something like 0.067, if I'm correct.

`.67` is probably what you want. `.067` means 67 thousandths not 67 hundredths. — Hogan, Aug 11 '14 at 18:35
@Hogan If you're declaring the float, you should have it `=0.67f`. See [Why is the “f” required when declaring floats?](http://stackoverflow.com/questions/11519743/why-is-the-f-required-when-declaring-floats) — Scott Solmer, Aug 11 '14 at 18:38
@Okuma.Scott - no idea what you are talking about, I'm not declaring anything -- I'm just pointing out what `.067` and `.67` mean. — Hogan, Aug 11 '14 at 18:41

score 2 · Accepted Answer · edited Aug 11 '14 at 19:08

2

To convert int to float just cast:

(float)trackBar.Value;

or

Convert.ToSingle(trackBar.Value);

Note that if you need to change range you need to perform at least division. I.e. in your case it looks like value is percentage, so divide by 100.0:

trackBar.Value / 100.0f;

Note that if you use 100 than result will be wrong as using integer division ( trackBar.Value / 100 will always be 0).

In general conversion for integer in 0-n range to (mixValue, maxValue) range:

 (trackBar.Value /( (float) maxValue - minValue)) + minValue;

edited Aug 11 '14 at 19:08

Alexei Levenkov

98,904
14
127
179

answered Aug 11 '14 at 18:34

Jon

3,230
1
16
28

1

Neither of those work. The minimum value of this float variable is 0 and maximum is 1. I need to get all numbers inbetween 0 and 1. (i.e.: 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 1) but with both your examples, the result is always the same: 1. – jay_t55 Aug 11 '14 at 18:38
@JasonPezzimenti, can you edit your post to add this information, along with a quick code example? Highlight what each of the data types are. – gunr2171 Aug 11 '14 at 18:40
Then just divide by 100! Convert.ToSingle(trackBar.Value) / 100.0; – Jon Aug 11 '14 at 18:40
-1: please make sure to edit in comments to provide complete answer. Thanks you. – Alexei Levenkov Aug 11 '14 at 18:53
@Mangist - I've edited your post with percentage/range comments to show what I thing would be ok answer. Feel free to rollback and put your own version. – Alexei Levenkov Aug 11 '14 at 19:09

avanek · Answer 2 · 2014-08-11T18:53:55.260

2

Divide the integer value by 100 as a float to get the percentage as a float. This will cause the value to be normalized to fall between 0 and 1 as a decimal value:

float trackBarPercentage = trackBar.Value / 100f;

Dividing the integer value by a float value will cause the right-hand side to automatically be casted to the float type. See the MSDN article Casting and Type Conversions for more info.

edited Aug 11 '14 at 18:53

answered Aug 11 '14 at 18:48

avanek

1,649
12
20

How do I turn 67 into float equivalent?

2 Answers2