#
# 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
def readints(prompt)
    # Read a line
    print prompt
    line = readline.chomp
    raise EOFError.new if line == 'quit' # You can also use a real EOF.
            
    # Go through each item on the line, converting each one and adding it
    # to retval.
    retval = [ ]
    for str in line.split(/\s+/)
	if str =~ /^\-?\d+$/
            retval.push(str.to_i)
	else
	    raise TypeError.new
	end
    end

    return retval
end

#
# Take a coeff and an exponent and return the string representation, ignoring
# the sign of the coefficient.
def term_to_str(coef, exp)
    ret = ""

    # Show coeff, unless it's 1 or at the right
    coef = coef.abs
    ret = coef.to_s     unless coef == 1 && exp > 0
    ret += "x" if exp > 0				# x if exponent not 0
    ret += "^" + exp.to_s if exp > 1			# ^exponent, if > 1.

    return ret
end

#
# Create a string of the polynomial in sort-of-readable form.
def polystr(p)
    # Get the exponent of first coefficient, plus 1.
    exp = p.length

    # Assign exponents to each term, making pairs of coeff and exponent,
    # Then get rid of the zero terms.
    p = (p.map { |c| exp -= 1; [ c, exp ] }).select { |p| p[0] != 0 }

    # If there's nothing left, it's a zero
    return "0" if p.empty?

    # *** Now p is a non-empty list of [ coef, exponent ] pairs. ***

    # Convert the first term, preceded by a "-" if it's negative.
    result = (if p[0][0] < 0 then "-" else "" end) + term_to_str(*p[0])

    # Convert the rest of the terms, in each case adding the appropriate
    # + or - separating them.  
    for term in p[1...p.length]
	# Add the separator then the rep. of the term.
	result += (if term[0] < 0 then " - " else " + " end) + 
		term_to_str(*term)
    end

    return result
end
        
#
# Run until some kind of endfile.
begin
    # Repeat until an exception or quit gets us out.
    while true
        # Read a poly until it works.  An EOF will except out of the
        # program.
	print "\n"
        begin
            poly = readints("Enter a polynomial coefficients: ")
	rescue TypeError
            print "Try again.\n"
	    retry
	end
	break if poly.empty?

        # Read and evaluate x values until the user types a blank line.
        # Again, an EOF will except out of the pgm.
        while true
	    # Request an integer.
	    print "Enter x value or blank line: "
	    x = readline.chomp
	    break if x == ''
            raise EOFError.new if x == 'quit'

	    # If it looks bad, let's try again.
	    if x !~ /^\-?\d+$/
                print "That doesn't look like an integer.  Please try again.\n"
		next
	    end

	    # Convert to an integer and print the result.
	    x = x.to_i
            print "p(x) = ", polystr(poly), "\n"
            print "p(", x, ") = ", polyval(x, poly), "\n"
	end
    end
rescue EOFError
    print "\n=== EOF ===\n"
rescue Interrupt, SignalException
    print "\n=== Interrupted ===\n"
else
    print "--- Bye ---\n"
end