Reverse a String in Python using While Loop

We will develop a program to reverse a string in python using while loop. We initialized a while loop with a value of the string. The len() function returns the number of items in an object. When the object is a string, the len() function returns the number of characters in the string.

Example of reverse string:-
String: Know Program
Reverse String: margorP wonK

Reverse a String using While Loop in Python

We will take a string while declaring the variables. Then, find the reverse of the string using while loop. Finally, the result will be displayed on the screen.

# Python program to reverse a string using while loop

# take inputs
string = 'Know Program'

# find reverse of string
i = string
reverse = ''
while(len(i) > 0):
   if(len(i) > 0):
      a = i[-1]
      i = i[:-1]
      reverse += a

# print reverse of string
print('The reverse string is', reverse)

Output:-

The reverse string is margorP wonK

Reverse a String in Python using While Loop

In the previous program, inputs are hardcoded in the program but in this program, input will be provided by the user.

# Python program to reverse a string using while loop

# take inputs
string = input('Enter the string: ')

# find reverse of string
i = string
reverse = ''
while(len(i) > 0):
   if(len(i) > 0):
      a = i[-1]
      i = i[:-1]
      reverse += a

# print reverse of string
print('The reverse string is', reverse)

Output for the input values test-case-1:-

Enter the string: While Loop
The reverse string is pooL elihW

Output for the input values test-case-2:-

Enter the string: reverse
The reverse string is esrever

Output for the input values test-case-3:-

Enter the string: Python
The reverse string is nohtyP

String Reverse in Python using While Loop

We can also take the help of a function to reverse a string in python using while loop. A function is a block of code that performs a specific task.

# Python program to reverse a string using while loop

def findReverse(string):  #user-defined function
   #find reverse of string
   i = string
   reverse = ''
   while(len(i) > 0):
      if(len(i) > 0):
         a = i[-1]
         i = i[:-1]
         reverse += a
   return reverse

# take inputs
string = input('Enter the string: ')

# calling function and display result
reverse = findReverse(string)
print('The reverse string is', reverse)

Output:-

Enter the string: String
The reverse string is gnirtS

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