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print 1..100 without loop, recursive, goto by Perl (not C++)
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#!/usr/bin/env perl | |
use strict; | |
use warnings; | |
my $str = "A " x 100; | |
my $i = 1; | |
$str =~ s/A/ $i++ /eg; | |
print "$str\n"; |
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#!/usr/bin/env perl | |
# https://jp.quora.com/%E3%83%AB%E3%83%BC%E3%83%97-%E5%86%8D%E5%B8%B0-goto%E3%82%92%E4%BD%BF%E3%82%8F%E3%81%9A%E3%81%AB1%E3%81%8B%E3%82%89100%E3%81%BE%E3%81%A7%E3%82%92%E5%8D%B0%E5%AD%97%E3%81%99%E3%82%8BC-%E3%83%97%E3%83%AD%E3%82%B0/answers/148184533?ch=2 | |
# original: https://www.quora.com/How-can-I-print-1-to-100-in-C%2B%2B-without-a-loop-goto-or-recursion?ch=10&share=9b09c507&srid=Jqvc | |
# | |
# > マイクロソフト社のデータサイエンティスト Conner Davis 氏は | |
# > 「C++のことは全くわからないのだが」と断りつつ想像の遥か斜め上を行く回答を書かれています. | |
use strict; | |
use warnings; | |
use Math::BigFloat; | |
# 各種数値リテラルの調整はなんとなく | |
Math::BigFloat->accuracy(300-2); | |
my $x = 1000 / Math::BigFloat->new(999**2); | |
my $str = $x->bstr(); | |
# map { $_+0 } があると "001" が 1 に変換される、つまり頭のゼロを落とす | |
# 同じ意味では map { sprintf "%d", $_ } でもいいし、 | |
# map がループっぽいという話であれば printf "%d " x 100, でもいいかもしれない | |
$str =~ s/^0\.//; | |
my @answer = map { $_+0 } $str =~ /(\d\d\d)/g; | |
print "@answer\n"; |
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#!/usr/bin/env perl | |
# range はループではない? | |
use strict; | |
use warnings; | |
print join " ", 1..100; | |
print "\n"; |
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