daily notes[4]

perl notes

1. Perl has an especial condition statement called as unless.

unless ( condition ) {...
}

it just like if (!condition).
2. there are few cycle structures as similar as other programmed language such as while,for,foreach.

while ( condition ) {...
}

for ($n = 0; $i <= $max; $n++) {...
}

foreach my $num(@nums) {print "the numeber in $num\n";
}

of course,the until statement exists in Perl language.

until ( condition ) {...
}

references

1. https://www.perl.org/learn.html/