From: Paul <tester.paul@...>
Date: 2007-03-16T06:40:12+09:00
Subject: Need help converting Perl to Ruby (detecting integers and decimals in strings)

I am trying to convert a Perl script to Ruby and have been having some
difficulty along the way (mostly because I don't know Perl).

I am currently stumped on one particular line in the old Perl script:
---
	foreach (@rawfields) {if ($_ > 0){$_ = int($_*100)/100}}
---

Background context:  @rawfields is an array that holds the contents of
an imported line from a text file.  Here are some sample lines from
the input file:
---
"0"	"0"	"0"	"0"	"0"	"0"	"Bar"
"5.66666"	"0"	"3.566662"	"1.383332"	"6"	"0"	"Foo"
---

My guess is that the Perl line iterates through each of the elements
in the array and rounds any integers to 2 decimals.

This raises a few problems for me.

1) How can I easily tell if the (string) value in each array element
is an integer or has a decimal value?

=> The desired output for text file line 2 is :
---
"5.67"   "0"   "3.57"   "1.38"   "6"   "0"   "Foo"
---


I tried the following in Ruby:
---
@rawfields.each_index do |x|
	if ( @rawfields[x].to_f > 0 )
		@rawfields[x] = ( (( @rawfields[x].to_f * 100 ).round.to_i ).to_f /
100 ).to_s
	end
end
---

But it produces the following output:
---
"5.67"  "0"  "3.57"  "1.38"  "6.0"  "0"  "Foo"
---

...which is close, but not quite what I want.  My output file now has
values like 1.0, 5.0, 62.0, etc.  If it's an integer, I don't want to
see the decimal.

Can anyone suggest an improvement to my code or a better translation
from Perl?

TIA.  Paul.