Perl 6 - Starting with the basics - The way of the program(REPL, String, quotation marks, number, sign(plus, minus), math notation, leading zeros, octal, Arithmetic operator)

Think Perl 6

開発環境

• macOS Sierra - Apple (OS)
• Emacs (Text Editor)
• Perl 6 (プログラミング言語)
• Rakudo(コンパイラ、実装)

Think Perl 6: How to Think Like a Computer Scientist (Laurent Rosenfeld(著)、Allen B. Downey(著)、Oreilly & Associates Inc)のPart 1(Starting with the basics)、Chapter 1(The way of the program)のExercises 1-1、2.を取り組んでみる。

Exercises 1-1、2.

コード(Emacs)

#!/usr/bin/env perl6
# -*- coding: utf-8 -*-

say '1.';
say 42 * 60 * 42;

say '2.';
say 10 / 1.61;

say '3.';
say 10 / (42 * 60 + 42);
say (10 / 1.61) / (42 * 60 + 42);
say (10 / 1.61) / ((42 * 60 + 42) / 60);
say (10 / 1.61) / ((42 * 60 + 42) / 60 / 60);

入出力結果(Terminal, REPL)

$ perl6
You may want to `zef install Readline` or `zef install Linenoise` or use rlwrap for a line editor

To exit type 'exit' or '^D'
> say 'perl6';
perl6
> say perl6';
===SORRY!=== Error while compiling:
Two terms in a row
------> say perl6⏏';
    expecting any of:
        infix
        infix stopper
        postfix
        statement end
        statement modifier
        statement modifier loop
> say 'perl6;
* 
*   C-c C-c
$ perl6
You may want to `zef install Readline` or `zef install Linenoise` or use rlwrap for a line editor

To exit type 'exit' or '^D'
>  -2
-2
> 2++2
===SORRY!=== Error while compiling:
Two terms in a row
------> 2++⏏2
    expecting any of:
        infix
        infix stopper
        statement end
        statement modifier
        statement modifier loop
> 2+2
4
> 2+-2
0
> 02
Potential difficulties:
    Leading 0 does not indicate octal in Perl 6. Please use 0o2 if you mean that.
    ------> 02⏏<EOL>
2
> 0o2
2
> 0o16
14
> 2 2;
===SORRY!=== Error while compiling:
Two terms in a row
------> 2⏏ 2;
    expecting any of:
        infix
        infix stopper
        statement end
        statement modifier
        statement modifier loop
> 2, 2;
(2 2)
> Invocant requires an instance of type IO::Handle, but a type object was passed.  Did you forget a .new?

> $ ./sample1.pl
1.
105840
2.
6.211180
3.
0.003903
0.0024243
0.145461
8.727654
$