THE PACKAGE JAVA.LANG

java.lang.Math

20.11

20.11.17

public static double rint(double a)

The result is the

double

 value that is closest in value to the argument and is equal

to a mathematical integer. If two

double

 values that are mathematical integers are

equally close to the value of the argument, the result is the integer value that is

even.

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.

20.11.18

public static int round(float a)

Round numbers are always false.

 Samuel Johnson (1709 1784)

The result is rounded to an integer by adding 1

2 , taking the floor of the result,

and casting the result to type

int

.

In other words, the result is equal to the value of the expression:

(int)Math.floor(a + 0.5f)

Special cases:

If the argument is NaN, the result is

0

.

If the argument is negative infinity, or indeed any value less than or equal to

the value of

Integer.MIN_VALUE

 ( 20.7.1), the result is equal to the value of

Integer.MIN_VALUE

.

If the argument is positive infinity, or indeed any value greater than or equal to

the value of

Integer.MAX_VALUE

 ( 20.7.2), the result is equal to the value of

Integer.MAX_VALUE

.

20.11.19

public static long round(double a)

The result is rounded to an integer by adding

1

2 , taking the floor of the result,

and casting the result to type

long

.

In other words, the result is equal to the value of the expression:

(long)Math.floor(a + 0.5d)

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