sparklyllama sparklyllama - 6 months ago 13
Java Question

Always Round UP a Double

How could I always round UP a double to an int, and never round it down.
I know of

Math.round(double)
, but I want it to always round up.
So if it was
3.2
, it gets rounded to 4.

Is this possible?

Answer

You can use Math.ceil() method.

See JavaDoc link: http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html#ceil(double)

From the docs:

ceil

public static double ceil(double a)

Returns the smallest (closest to negative infinity) double value that is greater than or equal to the argument and is equal to a mathematical integer. Special cases:

  • If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
  • If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.
  • If the argument value is less than zero but greater than -1.0, then the result is negative zero.

Note that the value of Math.ceil(x) is exactly the value of -Math.floor(-x).

Parameters:

  • a - a value.

Returns:

The smallest (closest to negative infinity) floating-point value that is greater than or equal to the argument and is equal to a mathematical integer.

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