From: "Peña, Botp" <botp@...>
Date: 2006-09-30T11:13:04+09:00
Subject: Re: "1".to_i *2 == 1 && "1".to_i*2 == 2 ?

fr Giovanni:
# "1".to_i*2 is equal to 2
# and
# "1".to_i *2 is equale to 1?

careful w #to_i. It's a powerful converter method that accepts a parameter for the needed conversion.


irb(main):021:0> "111".to_i 2      # base 2 conversion
=> 7
irb(main):022:0> "111".to_i * 2    # base 10 (default) conversion mult by 2
=> 222
irb(main):023:0> "111".to_i 2      # base 2 
=> 7
irb(main):024:0> "111".to_i(2)     # base 2 
=> 7
irb(main):025:0> "111".to_i(*2)    # base 2 
=> 7
irb(main):026:0> "111".to_i * 2    # base 10 times 2
=> 222
irb(main):027:0> "111".to_i*2      # base 10 times 2
=> 222
irb(main):028:0> "111".to_i *2     # base 2
=> 7
irb(main):029:0> "111".to_i 3      # base 3
=> 13

C:\family\ruby\outlook>ri -T String#to_i
------------------------------------------------------------ String#to_i
     str.to_i(base=10)   => integer
------------------------------------------------------------------------
     Returns the result of interpreting leading characters in _str_ as
     an integer base _base_ (2, 8, 10, or 16). Extraneous characters
     past the end of a valid number are ignored. If there is not a valid
     number at the start of _str_, +0+ is returned. This method never
     raises an exception.

        "12345".to_i             #=> 12345
        "99 red balloons".to_i   #=> 99
        "0a".to_i                #=> 0
        "0a".to_i(16)            #=> 10
        "hello".to_i             #=> 0
        "1100101".to_i(2)        #=> 101
        "1100101".to_i(8)        #=> 294977
        "1100101".to_i(10)       #=> 1100101
        "1100101".to_i(16)       #=> 17826049


btw, i'm dumb today in windows. i can't run "ri -T String#to_i" in irb. Tips pls.
C:\family\ruby\outlook>ruby -v
ruby 1.8.5 (2006-08-25) [i386-mswin32]
C:\family\ruby\outlook>ver
Microsoft Windows XP [Version 5.1.2600]

kind regards -botp

# Thanks
# Giovanni