=head1 Simple Variables

PIR has two kinds of variables. The most simple kind are Parrot
registers. Registers are named with a dollar sign followed by a single
letter type indicator and an integer. The letter in the name corresponds
to the type of the variable, I for integer, N for number (float), S for
string, and P for PMC (any kind of object). There are an unlimited
number of each type of register per call frame, and you can use them
in any order.

The C<=> symbol can be used to assign a value to one of these registers.

=cut

.sub main :main

    $I0 = 42         # set temp integer var to the integer value 42

    $N3 = 3.14159    # set temp float var to an approximation of pi

    $S5 = "Hello"    # set temp string var to "Hello"

    $P0 = new 'String'
    $P0 = "Ford"     # set temp PMC var to "Ford"

    say $I0

    say $N3

    say $S5

    say $P0

.end

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