Bubble Sort Using Arrays in Perl

Write a program using a one-dimensional array to implement a bubble sort algorithm.
The program will ask the user how many items to be processed and then the program will
display the original arrangement of the numbers and then display the sorted 
arrangement of the numbers on the screen.

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Sample Program Output

Program Listing

# bubble_sort_array.pl

# Author   : Jake R. Pomperada,MAED-IT,MIT

# Date     : April 11, 2020   Saturday  4:19 PM

# Location : Bacolod City, Negros Occidental

# Email    : jakerpomperada@gmail.com

# Websites : http://www.jakerpomperada.com

#            http://www.jakerpomperada.blogspot.com

@$items=(1..50);

$num_input,$a=0;

$b=0,$temp=0;

printf("\n\n");

printf("\tBubble Sort Using Arrays in Perl");

printf("\n\n");

printf("\tGive the size of array: ");

chomp($num_input=<STDIN>);

printf("\n");

for($a=0;$a<$num_input;$a+=1) 

{

printf("\tEnter Grade No. %d : ",$a+1);

    chomp($items[$a]=<STDIN>);

    }     

printf("\n\n");

printf("\tOriginal Array Elements Arrangement");

printf("\n");

printf("\t");

for($a=0;$a<$num_input;$a+=1) {

   printf("%d ",$items[$a]);    

  } 

# Bubble Sort Code     

for($a=1;$a<$num_input;$a+=1)

    {

    for($b=0;$b<($num_input-$a);$b+=1) {

        if($items[$b]>$items[$b+1])

           {

            $temp=$items[$b];

            $items[$b]=$items[$b+1];

            $items[$b+1]=$temp;

            }

      }

    }   

printf("\n\n");

printf("\tSorted Array Elements Arrangement");

printf("\n");

printf("\t");

  for($a=0;$a<$num_input;$a+=1) {

    printf("%d ",$items[$a]);      

    }

printf("\n\n");

printf("\tEnd of Program");

printf("\n\n");