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display ascii

adiolord
Novice

Feb 9, 2009, 3:01 PM

Post #1 of 9 (469 views)

display ascii	Can't Post

Basically I have to prompt the user for a case insensitive selection of either (a, A, b, B) string value, if they choose a/A, display all 255 ASCII characters in an array in ascending order, b/B, descending order.

If neither a/A/b/B are chosen report an invalid selection and loop until successful. I am brand new to Perl and would love some help getting this script off the ground.

Thankyou!

KevinR
Veteran

Feb 9, 2009, 7:23 PM

Post #2 of 9 (463 views)

Re: [adiolord] display ascii [In reply to]	Can't Post

Code

use strict; 
use warnings; 
 
print "Enter a/A/b/B: "; 
my $in = <STDIN>; 
chomp $in; 
unless ($in =~ /^[ab]$/i) { 
   print "Ivalid entry\n"; 
   exit; 
} 
#here you display the ascii stuff

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KevinR
Veteran

Feb 9, 2009, 8:08 PM

Post #3 of 9 (454 views)

Re: [adiolord] display ascii [In reply to]	Can't Post

Why did you remove your code?
-------------------------------------------------

adiolord
Novice

Feb 9, 2009, 8:12 PM

Post #4 of 9 (453 views)

Post deleted by adiolord [In reply to]

adiolord
Novice

Feb 9, 2009, 8:14 PM

Post #5 of 9 (452 views)

Re: [adiolord] display ascii [In reply to]	Can't Post

I'm basically throwing rocks at everything I see untill I hit something I can kill and eat... must look like a horid mess eh

KevinR
Veteran

Feb 9, 2009, 8:59 PM

Post #6 of 9 (449 views)

Re: [adiolord] display ascii [In reply to]	Can't Post

Quote

I posted it, and saw a huge mistake lol

Thats cool, we love to point out errors. Wink

-------------------------------------------------

KevinR
Veteran

Feb 9, 2009, 9:02 PM

Post #7 of 9 (447 views)

Re: [adiolord] display ascii [In reply to]	Can't Post

Error here:

Code

for ( $i;$i <= 255; $i++ ) {  
$ascii[$i] = chr($i) ;  
}

Should be:

Code

for ( $i=0;$i <= 255; $i++ ) {  
$ascii[$i] = chr($i) ;

I see you set $i at the beginning of the script but you have to initialize it inside the loop condition and assign it a value.
}
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adiolord
Novice

Feb 9, 2009, 10:05 PM

Post #8 of 9 (442 views)

Re: [KevinR] display ascii [In reply to]	Can't Post

It works though assigned at the beginning, and also, would that not slow down the loop? or does it only work with what is after the set variable being $i=0?

FishMonger
Veteran

Feb 9, 2009, 11:00 PM

Post #9 of 9 (441 views)

Re: [adiolord] display ascii [In reply to]	Can't Post

Why do you keep deleting your code? Is that so your instructor doesn't know that you're getting help from others?

for ( $i=0;$i <= 255; $i++ ) {

is better written as

for my $i ( 0..255 ) {

There are a number of issues I could point out, but your instructor might accept this homework as is.

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