Numbers

Integers of any size, rational arithmetic where 0.1 + 0.2 == 0.3, and the usual operators.

Raku integers grow as large as they need to — no overflow, no special "big integer" type to reach for:

say 2 ** 100;

1267650600228229401496703205376

Decimals are exact #

Decimal literals are rational numbers (Rat), not binary floating point. The classic floating-point surprise simply doesn't happen:

say 0.1 + 0.2;
say 0.1 + 0.2 == 0.3;
say 1/3 + 1/6;

0.3
True
0.5

1/3 really is one third, so a third plus a sixth is exactly a half.

The usual operators #

+, -, *, /, ** (power), % (remainder), and div (integer division). %% asks "is it evenly divisible?" and answers True or False:

say 17 % 5;
say 17 div 5;
say 10 %% 5;
say 10 ** -2;

2
3
True
0.01

Try it #

Is the year 2100 divisible by 400? Print the answer with %%.

my $year = 2100;

my $year = 2100;
say $year %% 400;

False