GeezerVison

Hello everyone, welcome back to Programming In Python! Here we will learn a simple Python logic to find the reverse of a number using a slice operation.

Here we read a number from the user and reverse that number using slice operations. We first cast that integer number as a string and then perform a slicing operation to reverse the number.

Syntax : str(num)[::-1])

We can also reverse a number without using slice operations, which is discussed in another post.

You can also watch the video on YouTube here.

Program on GitHub

Task :

To reverse a given integer number.

Approach :

• Read an input number using input() or raw_input().
• Check whether the value entered is an integer or not.
• We convert that integer number to a string str(num).
• Now we use advanced slice operation [start:end:step] leaving the start and empty and giving step a value of -1, this slice operation reverses the string.
• Print the result.

Program on GitHub

Program :

num = input('Enter any number : ')

try:
    val = int(num)
    print('Reverse of the given number is : ', str(num)[::-1])
except ValueError:
    print("That's not a valid number!")

Output :

Program on GitHub

You can also find the video on YouTube here.

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