Question

Write a program, Lab02_Q4.py, that inputs a string from the user, and creates a new string that deletes each non-alphanumeric character in the original string. You should solve this problem in 2 ways, first use a for loop that iterates through each character in the string, the second should use a while loop that iterates through a range. Keep spaces in the new string also.

Hint: You can invoke the isalnum() function on a character, and it will return True if the string is alphanumeric, False if not. ‘5’.isalnum() -> True. You can invoke the isspace() function on a character to check if the character is a space or not.

Answer 1

Here is the answer for your question in Python Programming Language.

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CODE :

#read user input userInput = input("Enter a string: ") #Initialises a string with empty value newString = "" #Using for loop, loops through each character of string for eachCharacter in userInput: #if it is an alphanumeric letter or a space if eachCharacter.isalnum() or eachCharacter.isspace(): #adds it to the newString newString += eachCharacter    print("Using Method 1 : FOR LOOP, the new string is \"{0}\"".format(newString)) newString = "" i = 0 #Using while loop to repeat length of string times while i < len(userInput): #if it is an alphanumeric letter or a space if userInput[i].isalnum() or userInput[i].isspace(): #adds it to the newString newString += userInput[i] i = i+1 print("Using Method 1 : WHILE LOOP, the new string is \"{0}\"".format(newString))

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SCREENSHOTS :

Please see the screenshots of the code below for the indentations of the code.

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OUTPUT :

Any doubts regarding this can be explained with pleasure :)