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Hollow square program

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  Hollow square program siimnurges@gmail.com - 2012-12-12 08:48 -0800
    Re: Hollow square program Chris Angelico <rosuav@gmail.com> - 2012-12-13 03:59 +1100
      Re: Hollow square program siimnurges@gmail.com - 2012-12-12 09:22 -0800
        Re: Hollow square program Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-12 10:35 -0700
        Re: Hollow square program Peter Otten <__peter__@web.de> - 2012-12-12 18:44 +0100
          Re: Hollow square program siimnurges@gmail.com - 2012-12-12 09:52 -0800
            Re: Hollow square program Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-12-12 23:47 +0000
              Re: Hollow square program Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-13 00:12 +0000
          Re: Hollow square program siimnurges@gmail.com - 2012-12-12 09:52 -0800
      Re: Hollow square program siimnurges@gmail.com - 2012-12-12 09:22 -0800
    Re: Hollow square program Mitya Sirenef <msirenef@lightbird.net> - 2012-12-12 12:18 -0500
      Re: Hollow square program siimnurges@gmail.com - 2012-12-12 09:25 -0800
      Re: Hollow square program siimnurges@gmail.com - 2012-12-12 09:25 -0800

#34698 — Hollow square program

Hey, I need to write a program that prints out a square, which is empty on the inside. So far, I've made a program that outputs a square, which is full on the inside.
P.S. Between every asterisk there needs to be a space(" ")
Here's my code:

print("Rows: ")
rows = int(input())
for i in range(rows):
    for j in range(rows):
        print("* ", end="")
    print("")

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#34699

On Thu, Dec 13, 2012 at 3:48 AM,  <siimnurges@gmail.com> wrote:
> Hey, I need to write a program that prints out a square, which is empty on the inside. So far, I've made a program that outputs a square, which is full on the inside.
> P.S. Between every asterisk there needs to be a space(" ")
> Here's my code:
>
> print("Rows: ")
> rows = int(input())
> for i in range(rows):
>     for j in range(rows):
>         print("* ", end="")
>     print("")

You're going to need some kind of special handling of the beginning
and end of each row, except for the first and last rows. Since you
have i and j counting up from 0 to (rows-1), you can do this by simply
checking those two variables and then decide whether to print out a
star or a space (or, since there's spaces after the stars, whether to
print out a star and a space or two spaces).

Since you're being taught loops, I'm confident your course will have
already taught you how to make a decision in your code. It's another
Python statement.

Next time, by the way, you may want to explicitly state that this is
part of a course you're studying. Otherwise, you may come across as
sneakily trying to cheat your way through the course, which I'm sure
you would never do, would you? :) We're happy to provide hints to help
you understand Python, but not to simply give you the code (and if
anybody does, I hope you have the integrity, and desire to learn, to
ignore that post and work it out for yourself).

Have fun!

ChrisA

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#34701

Well, I did some modifications and got a hollow square, but the columns aren't perfectly aligned with the rows (at least if input is 5. Thanks for the help :)

rows = int(input())
s1="* "*rows
s2="*"+(rows-2)*" "+"*"
print(s1)
for s in range(rows-2):
    print(s2)
print(s1)

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#34706

On Wed, Dec 12, 2012 at 10:22 AM,  <siimnurges@gmail.com> wrote:
> Well, I did some modifications and got a hollow square, but the columns aren't perfectly aligned with the rows (at least if input is 5. Thanks for the help :)
>
> rows = int(input())
> s1="* "*rows
> s2="*"+(rows-2)*" "+"*"
> print(s1)
> for s in range(rows-2):
>     print(s2)
> print(s1)

The (rows-2)*" " in s2 is only enough spaces to account for the
(rows-2) inner * characters in s1.  You also need additional spaces in
s2 to match up with for the (rows-1) space characters in between the *
characters in s1.

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#34708

siimnurges@gmail.com wrote:

> Well, I did some modifications and got a hollow square, but the columns
> aren't perfectly aligned with the rows (at least if input is 5. Thanks for
> the help :)
> 
> rows = int(input())
> s1="* "*rows
> s2="*"+(rows-2)*" "+"*"
> print(s1)
> for s in range(rows-2):
>     print(s2)
> print(s1)

The first and last row have an extra space between the asterisks. For the 
square to look like a square you need to add these to the other rows (and 
thus s2), too.

Also note that your code prints a minimum of two rows.

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#34711

Thanks, got it now :)

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#34735

On 12/12/2012 17:52, siimnurges@gmail.com wrote:
> Thanks, got it now :)
>

Please quote something in context for future readers.  Roughly translated

<sorry for shouting, apologies if I'm wrong>

THE ONLY GOOD GOOGLE USER IS A DEAD GOOGLE USER

</sorry for shouting, apologies if I'm wrong>

-- 
Cheers.

Mark Lawrence.

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#34737

On Wed, 12 Dec 2012 23:47:20 +0000, Mark Lawrence wrote:

> THE ONLY GOOD GOOGLE USER IS A DEAD GOOGLE USER
> 
> </sorry for shouting, apologies if I'm wrong>

I say, that's a bit much. That crosses a line from a friendly contempt 
for ignorant Gmail users to something rather nasty. Preemptive apology or 
not, I don't think that is acceptable here.


-- 
Steven

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#34712

Thanks, got it now :)

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#34702

Well, I did some modifications and got a hollow square, but the columns aren't perfectly aligned with the rows (at least if input is 5. Thanks for the help :)

rows = int(input())
s1="* "*rows
s2="*"+(rows-2)*" "+"*"
print(s1)
for s in range(rows-2):
    print(s2)
print(s1)

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#34700

On 12/12/2012 11:48 AM, siimnurges@gmail.com wrote:
> Hey, I need to write a program  that prints out a square, which is empty on the inside. So far, I've 
made a program that outputs a square, which is full on the inside.
 > P.S. Between every asterisk there needs to be a space(" ")
 > Here's my code:
 >
 > print("Rows: ")
 > rows = int(input())
 > for i in range(rows):
 > for j in range(rows):
 > print("* ", end="")
 > print("")


Small note: print("") is the same as print()

The general idea is: make a string that represents top/bottom of the
square, make a string for the middle part, print out the first string,
then print out middle part n-2 times, then print out first string again.

Did you know you can multiply strings? e.g.:

space  = ' '
border = '*'
line   = border + space*70

  -m

-- 
Lark's Tongue Guide to Python: http://lightbird.net/larks/

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#34703

Well, I did some modifications, but the columns aren't perfectly aligned with the rows. 

rows = int(input())
s1="* "*rows
s2="*"+(rows-2)*" "+"*"
print(s1)
for s in range(rows-2):
    print(s2)
print(s1) 

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#34704

Well, I did some modifications, but the columns aren't perfectly aligned with the rows. 

rows = int(input())
s1="* "*rows
s2="*"+(rows-2)*" "+"*"
print(s1)
for s in range(rows-2):
    print(s2)
print(s1) 

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