Why does not this work?

ruby-talk
1

Hi guys,
I am trying to learn Ruby. I know some Perl. I cannot make following
script work. Could you please help me understand why "c" value in the
code does not print. It prints "0" for me. Thank you for help.

code:

···

--------
temp1 = 1
temp2 = 15

puts "F:C"

temp1.upto(temp2) do |i|
  c = (i-32)*(5/9)
  print i,':',c,"\n"
end
--------

--
Posted via http://www.ruby-forum.com/.

2

Try 5/9 in irb, and then try 5.0/9, and then you may be closer to where you want to be =]

ruby-1.9.2-p290 :001 > 5.class.name
  => "Fixnum"
ruby-1.9.2-p290 :002 > 5.0.class.name
  => "Float"

Sam

···

On 08/11/11 17:01, Erbay Yigit wrote:

Hi guys,
I am trying to learn Ruby. I know some Perl. I cannot make following
script work. Could you please help me understand why "c" value in the
code does not print. It prints "0" for me. Thank you for help.

code:
--------
temp1 = 1
temp2 = 15

puts "F:C"

temp1.upto(temp2) do |i|
   c = (i-32)*(5/9)
   print i,':',c,"\n"
end
--------

3

I am trying to learn Ruby. I know some Perl. I cannot make following
script work. Could you please help me understand why "c" value in the
code does not print. It prints "0" for me. Thank you for help.

5/9

=> 0

5.0/9.0

=> 0.555555555555556

···

On Mon, Nov 7, 2011 at 8:01 PM, Erbay Yigit <erbayyigit@gmail.com> wrote:

--
Hassan Schroeder ------------------------ hassan.schroeder@gmail.com

twitter: @hassan

4

5/9 is integer division, so it evaluates to 0. That is multiplied with i-32 which also evaluates to 0.

The fix is to force floating point division by using at least one floating point literal in the division operation:

c = (i-32)*(5.0/9)

-Jeremy

···

Erbay Yigit <erbayyigit@gmail.com> wrote:

Hi guys,
I am trying to learn Ruby. I know some Perl. I cannot make following
script work. Could you please help me understand why "c" value in the
code does not print. It prints "0" for me. Thank you for help.

code:
--------
temp1 = 1
temp2 = 15

puts "F:C"

temp1.upto(temp2) do |i|
c = (i-32)*(5/9)
print i,':',c,"\n"
end
--------

--
Posted via http://www.ruby-forum.com/.

5

Thank you for the help guys.

···

--
Posted via http://www.ruby-forum.com/.