Implement the reverseString
method, which accepts a string
and returns its reverse.
Beginner Level
String Manipulation Loop
Write a method named
reverseString
that accepts a string as input and returns its reverse. You must not use built-in reverse functions; instead, implement the logic manually using loops or string manipulation techniques.To reverse a string without using built-in reverse functions, follow these steps:
-
Check for Empty or Null Input
If the input string is empty ornull
, return it directly or handle it as an edge case. -
Determine String Length
Calculate the number of characters in the string. -
Create a New String/Array for the Result
Allocate a new variable (or array) to hold the reversed characters. -
Reverse the Characters Using a Loop
Use a loop to copy characters from the end of the original string to the beginning of the new one. -
Terminate the New String if Required
Some languages require you to manually add a string terminator (like\0
in C), others don’t. -
Return the Reversed String
Pseudocode:
function reverseString(input):
if input is null or empty:
return input
length = get length of input
result = create empty string of size length
for i from 0 to length - 1:
result[i] = input[length - 1 - i]
return result