Reverse an array in Java

Perl | Reverse an array

Last Updated : 23 Sep, 2018

Reverse an array or string in Perl.

Iterative Way:
Iterate over the array from 0 to mid of array.
Swap the arr[i] element with arr[size-i] element.

#Perl code to reverse an array iteratively 
  
#declaring an array of integers 
@arr = (2, 3, 4, 5, 6, 7); 
  
# Store length on array in $n variable 
$n = $#arr; 
  
#Print the original array 
print "The original array is : "; 
for $i (0 .. $#arr) 
{ 
    print $arr[$i], " "; 
} 
  
#run a loop from 0 to mid of array 
for my $i (0 .. $#arr/2) 
{ 
    #swap the current element with size-current element 
    $tmp = $arr[$i]; 
    $arr[$i] = $arr[$n-$i]; 
    $arr[$n-$i] = $tmp; 
} 
  
#Print the reversed array 
print "\nThe reversed array is : "; 
for $i (0 .. $#arr) 
{ 
    print $arr[$i], " "; 
} 

Output:

The original array is : 2 3 4 5 6 7 
The reversed array is : 7 6 5 4 3 2

Using Inbuilt Function:
Perl has an inbuilt function to reverse an array or a string or a number.

#Perl code to reverse an array using inbuilt function reverse 
  
#declaring an array of integers 
@arr = (2, 3, 4, 5, 6, 7); 
  
#Print the original array 
print "The original array is : "; 
for $i (0 .. $#arr) 
{ 
    print $arr[$i], " "; 
} 
  
#store the reversed array in @rev_arr 
@rev_arr = reverse(@arr); 
  
#Print the reversed array 
print "\nThe reversed array is : "; 
for $i (0 .. $#rev_arr) 
{ 
    print $rev_arr[$i], " "; 
} 

Output:

The original array is : 2 3 4 5 6 7 
The reversed array is : 7 6 5 4 3 2

Reverse an array in Java

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Gautam Karakoti

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