Source Code (Python)

# coding=utf-8

"""
    Reverse a given text

    # ----- REVERSE THE ENTIRE SENTENCE -----
    # This method reverses the entire sentence
    # The reverse_text function directly performs this operation

    # ----- REVERSE WORD BY WORD -----
    # This method reverses the sentence word by word
    # First, split the sentence by space character and assign to an array
    # Then reverse each element of this array
    # The reverse_text function already reverses the incoming string
    # So we will send each string one by one to that function
    # After reversing, we will write our array together with " ".join
"""

input_text = input("Enter a sentence: ")
reversed_text = ""


def reverse_text(text, reversed):
    for i in range(len(text) - 1, -1, -1):
        reversed += text[i]
    return reversed


words = []
for i in input_text.split(' '):
    words.append(reverse_text(i, ""))

completely_reversed = reverse_text(input_text, reversed_text)
word_by_word_reversed = " ".join(words)

print(
    """
    Original text:                  {}
    
    Completely reversed:            {}
    
    Word by word reversed:          {}
    
    """.format(input_text, completely_reversed, word_by_word_reversed))