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Oliver Haag www.ohcon.de

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convert between characters and values

// character to ASCII value: use ?
?a     # => 97
?\n    # => 10


// string to integer: use []
'a'[0]        # => 97
'hallo'[1]    # => 97


// integer / number to character: use .chr
97.chr     # => "a"
10.chr     # => "\n"


//more info: "Ruby Cookbook", O'Reilly
to ruby rails integer character ascii value by ovhaag on May 18, 2007

count characters

// Sample Output, "character (byte) occurs n times", 32 = space
// s (115) occurs 3 times
// n (110) occurs 1 times
// ..
// (32) occurs 3 times

class Counter
  
def initialize()
  @characters = Hash.new(0)
end

def read()
  @text = IO.read("text.txt")
end

def count_chars
  @text.each_byte do |ch|
  @characters[ch] +=1
  end
end

def report  
  @characters.each do |key, value|
    puts "#{key.chr} (#{key}) occurs #{value} times"
  end  
end

end



// usage
count = Counter.new()
count.read
count.count_chars
count.report
to ruby character file by ovhaag on Oct 04, 2006
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