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Java: what is 1d?

Moved to the next expression in Java and I have no idea what "1d" ( r

is an integer) means . There are also options for lengths, doubles ... What are they for and what are they used for?

double y = r / (Integer.MAX_VALUE + 1d);

Thank!

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1 answer


The suffix d

after the number means double

, the suffix f

means the number with float

.

You can express a double literal eight ways: 1.0

, 1d

, 1D

, 1.0d

, 1.0D

, 1.

, 1.d

, 1.D

and not quite double literal: (double)1

. The last example 1

is a literal, int

but then I will cast it to double

.



In your expression: double y = r/(Integer.MAX_VALUE + 1d);

The parentheses increase the precedence of the expression, so (Integer.MAX_VALUE + 1d)

will be evaluated first, and since this the intValue + doubleValue

result will be of type double

so r/(Integer.MAX_VALUE + 1d)

will also double

.

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