Question About Code - Topic

☰

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Posts: 31,359

Joined: Mar 25 2009

Gold: 15.00

Jul 26 2018 06:19pm

Code

public class DecimalComparator {
public static boolean areEqualByThreeDecimalPlaces(double x, double y) {

if((int) (x * 1000) == (int) (y * 1000)) {
return true;
}
return false;
}
}

I don't understand what (int) does.....?
it it for making double into int, type casting?

This post was edited by ferf on Jul 26 2018 06:33pm

SmITexX

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Jul 27 2018 03:27am

it casts it to int type

SmITexX

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Posts: 4,748

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Jul 27 2018 03:29am

Quote (SmITexX @ Jul 27 2018 11:27am)

it casts it to int type

edit
casting to int doesn't round but only cuts off decimal digits

xapeu

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Posts: 11,273

Joined: Apr 26 2008

Gold: 3,303.50

Jul 28 2018 11:27am

Cast to int by truncating!
By the way if you have this pattern

Code

if (cond) {
return true;
}
else {
return false;
}

You can always change it to

Code

return cond;

In your case, the body of the function could simply be

Code

return ((int) (x * 1000) == (int) (y * 1000));

This post was edited by xapeu on Jul 28 2018 11:29am

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