Reverse a number in PL/SQL

Prerequisite – PL/SQL introduction

In PL/SQL code groups of commands are arranged within a block. A block group related declarations or statements.
In declare part, we declare variables and between begin and end part, we perform the operations.

Here, first, we take three variables num, len, and revnum and assign the value in num and fin is the length of the number and after finding the length we start a loop from maximum length to starting length, we assign the num into revnum and print revnum.

Examples:

Input : 123456
Output :654321

Input :87459
Output :95478

Below is the required implementation:

declare
   
-- declare variable num , len  
-- and revnum of datatype varchar 
 num varchar2(5):='12345';              
 len number(2);             
 revnum varchar2(5);         
   
  
begin
   
-- Here we find the length of string 
 len := length(num);                 
  
-- here we starting a loop from max len to 1 
 for i in reverse 1.. len 
 loop 
  
-- assigning the reverse number in revnum                
 revnum := revnum || substr(num,i,1); 
 end loop; 
  
-- Print the Result 
dbms_output.put_line('given number ='|| num);  
dbms_output.put_line('reverse number ='|| revnum);  
 end;                         
  
-- Program End 

/div>

Output :

reverse of number is 654321.

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