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Convert Between Characters And Values

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// 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
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