fig20_08.pl

来自「PERL语言资料 可以用于PERL程序设计」· PL 代码 · 共 74 行

#!/usr/bin/perl
# Figure 20.8: fig20_08.pl
# Demonstrating stacks and queues.

use warnings;
use strict;

my ( @stack, @queue );

print( "Using the stack:\nPush 1 to 20\n" );

for ( 1 .. 20 ) {
   push( @stack, $_ );
}

print( "Pop the top 10 elements: " );

for ( 1 .. 10 ) {
   print( pop( @stack ), " " ); 
}

print( "\nPush 21 to 25\n" );

for ( 21 .. 25 ) {
   push( @stack, $_ );
}

print( "Pop remaining elements: " );

while ( @stack ) {
   print( pop( @stack ), " " );
}

print( "\n\nUsing the queue:\nEnqueue 1 to 20\n" );

for ( 1 .. 20 ) {
   push( @queue, $_ );
}

print( "Dequeue first 10 elements: " );

for ( 1 .. 10 ) {
   print( shift( @queue ), " " );
}

print( "\nEnqueue 21 to 25...\n" );

for ( 21 .. 25 ) {
   push( @queue, $_ );
}

print( "Dequeue remaining elements: " );

while ( @queue ) {
   print( shift( @queue ), " " );
}


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