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<article>
<h2>Ruby mode</h2>
<form><textarea id="code" name="code">
# Code from http://sandbox.mc.edu/~bennet/ruby/code/poly_rb.html
#
# This program evaluates polynomials.  It first asks for the coefficients
# of a polynomial, which must be entered on one line, highest-order first.
# It then requests values of x and will compute the value of the poly for
# each x.  It will repeatly ask for x values, unless you the user enters
# a blank line.  It that case, it will ask for another polynomial.  If the
# user types quit for either input, the program immediately exits.
#

#
# Function to evaluate a polynomial at x.  The polynomial is given
# as a list of coefficients, from the greatest to the least.
def polyval(x, coef)
    sum = 0
    coef = coef.clone           # Don't want to destroy the original
    while true
        sum += coef.shift       # Add and remove the next coef
        break if coef.empty?    # If no more, done entirely.
        sum *= x                # This happens the right number of times.
    end
    return sum
end

#
# Function to read a line containing a list of integers and return
# them as an array of integers.  If the string conversion fails, it
# throws TypeError.  If the input line is the word 'quit', then it
# converts it to an end-of-file exception