CODEWITHSUNDEEP
pythonwhile-loop
Bilal Anees
Bilal Anees

Reputation: 25

Two while Loop Statements showing different results

I am new to python and struggling with 2 simple sets of code in which there is while loop used with a little difference (atleast in my opinion). These code should print 'i' while it is less than 6 but one set of code is printing '1 2 3 4 5 6' and the other is printing '0 1 2 3 4 5'. I'm not sure why there is the difference. Any help will be much appreciated. Code is below:

this code is printing: '1 2 3 4 5 6':

i=0
while i<6:
 i+=1
 print(i)

this code is printing: '0 1 2 3 4 5':

i=0
while i<6:
 print(i)
 i+=1

Upvotes: 1

Views: 51

Answers (2)

Aniketh Malyala
Aniketh Malyala

Reputation: 2660

In the first example, you are incrementing i before you print the value:

enter image description here

In the second example, however, you print the value of i first, and then increment it. That means, in the very first iteration, 0 is printed first instead of 1. Similarly, the last iteration will print a 5 since the value of i is incremented to 6 afterwards, and the while loop breaks.

enter image description here

Hopefully this helped! Please let me know if you have any further questions or need any clarification :)

Upvotes: 2

Christian Jensen
Christian Jensen

Reputation: 395

The magic you are seeing is because of i+=1

This is essentially the same as i = i + 1

In English that says "Make i to be equal whatever i is right now plus 1"

Upvotes: 0

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