Question

I want to count from 0.0001 to 1 with 0.0001 steps in ruby.
I wrote this code but it enters to an infinite loop. Somewhy the interpreter does a wrong summation.

x = 0.0001
while x != 1.0
  puts x
  x = x + 0.0001
end

Here is the first 10 value it gives:

0.0001
0.0002
0.00030000000000000003
0.0004
0.0005
0.0006000000000000001
0.0007000000000000001
0.0008000000000000001
0.0009000000000000002
0.0010000000000000002

It should be 0.0001, 0.0002, 0.0003, etc…
How can I make it working?
Thanks!

Answer 1

The problem is that real numbers in ruby are not represented exactly due to binary storage and manipulation. I would do this

x = 1
while x < 10000
    puts (x/10000).round(4)
    x += 1
end