convert 0.54321 to 0.54 and convert 2 to 100

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clankill3r

convert 0.54321 to 0.54 and convert 2 to 100

in Programming Questions • 1 year ago

float test = 0.54321;
test *= 100;
test = int(test);
test/=100;
println(test);

This works, but is there a faster method?

And this gives me 2 decimals behind the .

I want a int:

int floatDecimals

to tell how many numbers after the comma are allowed.

So for this case,

int floatDecimals = 2;

but in my example it has to be 100.

So how can i convert 2 to 100? I know i can multiply it by 50... but that makes 3 150 where i want 3 to be 1000, 4 to be 10000...

Replies(1)

toxmeister

Re: convert 0.54321 to 0.54 and convert 2 to 100

1 year ago

Same outcome, but slightly different approach: The MathUtils class of toxiclibs has a roundTo() function which takes a value and rounds it to a given precision. That precision is an absolute value. It could be matching a number of digits (e.g. for 2 digit precision use 0.01) or it could be quarters (0.25) or any other step distance...

import toxi.math.*;
println(MathUtils.roundTo(88,50)); // snap to steps of 50, example will produce 100
println(MathUtils.roundTo(2,PI)); // snap to 180 degrees, example will produce PI

The source for that function is here:

http://hg.postspectacular.com/toxiclibs/src/22f8adb874f6/src.core/toxi/math/MathUtils.java#cl-534

To produce a an absolute precision value based on number of digits use:

float precision=pow(10,-2); // 2 digits after the dot, note the minus infront of the 2

--
http://postspectacular.com | http://toxiclibs.org

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convert 0.54321 to 0.54 and convert 2 to 100

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