Day 71: Python Program to Find the Length of a String without Library Function

 

def string_length(s):

    count = 0

    for _ in s:  

         count += 1

    return count

input_string = input("Enter a string: ")

length = string_length(input_string)

print(f"The length of the string is: {length}")

#source code --> clcoding.com 

Code Explanation:

Function Definition

def string_length(s):

Purpose: Defines a function named string_length to calculate the length of a string.

Parameter:

s: The string whose length is to be determined.

    count = 0

Logic:

 Initializes a variable count to 0. This variable will store the number of characters in the string.

    for _ in s:

Logic: Iterates through each character in the string s using a for loop.

The _ is a placeholder indicating the loop does not use the actual character for any operations. It simply counts the number of iterations.

        count += 1

Logic: For each iteration (i.e., for each character in the string), increments the count variable by 1.

    return count

Logic: After the loop finishes (indicating all characters have been counted), the function returns the total value of count, which is the length of the string.

Input Handling

input_string = input("Enter a string: ")

Purpose: Prompts the user to enter a string and stores the input in the variable input_string.

length = string_length(input_string)

Logic: Calls the string_length function, passing input_string as an argument. The returned value (length of the string) is stored in the variable length.