while loop doesn't stop, with if statement as nested loop in python

Question

The code doesn't stop even if 0 is fed as value. what could be the possible reason? see my code below:

x = -1
num = -9

print("For exit press 0")

while (x != 0):
    num = input("Enter a number  :")
    print("You entered: ", num)
    x = num
    if x == 0:
        break


print("Good bye!")

Thanks!

Please clarify what language you're using. Looks like Python. — Tatsuyuki Ishi
– Tatsuyuki Ishi, Commented Mar 29, 2017 at 5:49
For me this works (if this is Python code). My Python 2.7.6 (OSX). — stephanmg
– stephanmg, Commented Mar 29, 2017 at 5:52
it worked with me, I just copied the code and run it and it works as expected, I'm on python 2.7 — Abdallah Alsamman
– Abdallah Alsamman, Commented Mar 29, 2017 at 5:52
Python 2 and 3 probably treats string comparison differently. — Tatsuyuki Ishi
– Tatsuyuki Ishi, Commented Mar 29, 2017 at 5:54

Tatsuyuki Ishi · Accepted Answer · 2017-03-29 05:55:40Z

2

The problem is that you're comparing string to integer; Python is weakly typed, so no warning is given.

Additionally, input() casts the input in Python 2, but not Python 3. This is why the code works as intended in Python 2.

Notes: You don't need parentheses for while condition. Formatting the string is recommended for outputting things.

x = -1

print("To exit press 0")

while x != 0:
    num = input("Enter a number:")
    print("You entered: {}".format(num))
    x = int(num)
    if x == 0:
        break

print("Good bye!")

answered Mar 29, 2017 at 5:55

Tatsuyuki Ishi

4,0714 gold badges31 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

ambrish dhaka Over a year ago

Thanks! I figured out that the only line I had to modify based on the clue from above answer is as follows: x = int(num) I just added int() so that the numeric value goes into variable x, and it worked.

Collectives™ on Stack Overflow

while loop doesn't stop, with if statement as nested loop in python

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related