Perl 6 Deep Dive

Integers

There are a few different directives for printing integer numbers in different formats:

Directive	Description
%b	An integer in binary representation
%d or %i	Signed decimal integer
%u	Unsigned decimal integer
%o	An integer in octal format
%x	Unsigned integer in hexadecimal format
%X	Same as %x but in uppercase

 

Let us print the same number in different formats:

printf "Binary: %b, decimal: %d, octal: %o\n", 10, 10, 10;
printf "Hexadecimal: %x, uppercased: %X\n", 10, 10;

The output of this program looks like this:

Binary: 1010, decimal: 10, octal: 12
Hexadecimal: a, uppercased: A

The %u directive expects an unsigned integer, so the compiler raises an error if it sees the negative number:

$ perl6 -e'printf "%u", ...