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19. π

Print the value of π.

The value of ! is accessible with no additional modules:

say π;

This instruction, not a surprise, prints the desired value:

3.14159265358979

As you may have noticed, a non-ASCII character was used in the code. Raku assumes that the source code is encoded as UTF-8 by default. Instead, a non-Unicode version can be used, too:

say pi;

There are a couple more built-in constants: tau and e; both of them have Unicode variants: ” and # (character code 0x1D452):

say τ;
say e;

The value of tau is equal to 2!, and the above program prints the following result:

6.28318530717959
2.71828182845905

It is also worth knowing that there’s a special constant for presenting infinity: Inf or ∞. This number is bigger than any other (reasonably big) number; either an integer or a floating-point value.

say 1E120 < ∞; # Prints True

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