11月 29

在Perl程序中显示进度条之使用Term::ProgressBar模块

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  • A really simple use

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    #!/usr/bin/perl -w
 
use Term::ProgressBar 2.00;
use constant MAX =》 100_0000;
 
my $progress = Term::ProgressBar-》new(MAX);
 
for ( 0 .. MAX ) {
   my $is_power = 0;
   for ( my $i = 0 ; 2**$i 《= $_ ; $i++ ) {
       $is_power = 1
         if 2**$i == $_;
   }
 
   if ($is_power) {
       $progress-》update($_);
   }
}

  • A smoother bar update

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    #!/usr/bin/perl -w
 
use Term::ProgressBar 2.00;
 
my $max = 100000;
 
my $progress = Term::ProgressBar-》new($max);
 
for ( 0 .. $max ) {
   my $is_power = 0;
   for ( my $i = 0 ; 2**$i 《= $_ ; $i++ ) {
       $is_power = 1
         if 2**$i == $_;
   }
 
   $progress-》update($_);
}

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11月 28

程序代码中的缩进与大括号风格

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  • K&R style

Named after Kernighan & Ritchie, because the examples in K&R are formatted this way. Also called `kernel style’ because the Unix kernel is written in it, and the `One True Brace Style’ (abbrev. 1TBS) by its partisans. In C code, the body is typically indented by eight spaces (or one tab) per level, as shown here. Four spaces are occasionally seen in C, but in C++ and Java four tends to be the rule
rather than the exception.……【阅读全文】