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### Solution: Laziness, Impatience, and Hubris

by domm (Chaplain)
 on Mar 08, 2002 at 21:20 UTC ( #150427=note: print w/replies, xml ) Need Help??

in reply to Laziness, Impatience, and Hubris

`use strict;`
Enable strict mode. There are no errors because of undefined vars because you used \$a and \$b, which are always defined, as they are used by sorting.
For the same reason, you choose @INC;

`map{\$a++}('g','r','e','p');`
You set \$a to 4.

`\$a=\$a-\$a--+\$a++;`
or written a little bit cleaner
`\$a=\$a - \$a-- + \$a++;`

But still rather hard to understand, because of the way auto-in/decrement worksin suffix mode:
What happens is (if I got it right):
`\$a=\$a - \$a-- + \$a++;`
\$a is now 3, but 4 is substracted
`\$a=3 - 4 + \$a++;`
`\$a=-1 + \$a++;`

\$a is incremented to 4, but 3 (the old value) is used in the addition
`\$a= -1 + 3`
\$a is now 2

`\$a++;`
And now its 3

`\$b=int(rand(\$a));`
sets \$b to a value between 0 and 2.

`\$b++`
increments it by one, so it is now 1, 2, or 3. Used to decide which virtue to print.

```map {chomp;@INC=split(/\D/);push(@_,(int(\$INC\$b/\$b),
int(\$INC\$b+\$a/\$b)));}(<DATA>);```
Here you map over all elements of the DATA array, doing the following things:
`chomp;`
remove the line brake at the end of the line
`@INC=split(/\D/);`
Set @INC, by splitting the current line on non-numeric values, thereby removing all charaters from the stuff in DATA. This made me wonder, because first I thought you where using the characters hidden between the numbers as your data. But, as I then found out, you just tossed me a red herring that I gullibly swalloed.
`push(@_,(int(\$INC\$b/\$b),int(\$INC\$b+\$a/\$b)))`
Now you modify your data structure. In the DATA-section, you stored the ascii values of each character (multiplied by either 1,2 or 3), like so (using the real characters): LIHamu (and these are NOT the 'L', the 'I', the 'H' etc you can see in the DATA section).
With this code segment, you first get item number \$b (and divide by \$b, so it is now the real ascii value), then you get \$b+\$a. As \$a is 3, this gets the next value of the selected virtue. The shorter virtues are space-padded at the end.

`map{printf("%c",\$_)}@_;`
Here you finally map over all values of @_, printing the character with the ascii value of \$_. A nice way to prevent the much-overused chr. Voila.

Nice work! Especially as it's not just one more japh.

I espcially liked the auto-in/decrement stuff and the wrong track you laid in DATA.

```--
#!/usr/bin/perl -w just another perl hacker
print+seek(DATA,\$=*.3,@-)?~~<DATA>:\$:__DATA__
```

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