September 2017
Beginner
402 pages
9h 52m
English
Content preview from Perl 6 Deep Dive
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Numeric data type
The Num type is used to store floating-point values. It corresponds to the double precision in C.
Notice that, in Perl 6, the Num value is only created when the numeric literal is spelled in a scientific notation. That is, the E part of the value must be present.
Thus, in the following examples, the numbers with only a decimal point will be of the Rat type:
say 3.14; # Ratsay 123.456; # Ratsay 0.9; # Rat
The following numbers represent the same values, but are of the Num type, as they use the exponential part in their definition:
say 3.14E0; # Numsay 1.23456E2; # Numsay 9E-1; # Num
Remember that the Num values use the packed IEEE binary format, so they are limited in precision, while Rat numbers keep their numerator and ...
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