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Basic Programs

Python program to find reverse of a number using slice

AVINASH NETHALA2 years ago2 years ago03 mins

Python program to find reverse of a number using slice

Hello everyone, welcome back toProgramming 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 inanother post.

You can also watch the video on YouTubehere.

Program on GitHub

Reverse a number – Code Visualization

Task :

To reverse a given integer number.

Approach :

Read an input number usinginput() orraw_input().
Check whether the value entered is an integer or not.
We convert that integer number to a stringstr(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!")