# Test file
# ECS 10, May 11, 2009

# function to print cx^p intelligently
# parameter: c, the coefficient
#            p, the exponent
#            NOTE: assumes p >= 0
# side effect: prints cx^p as follows:
#            COEFFICIENT: if c == 1, prints "+"
#            if c == -1, prints "-"
#            if c > 0, prints "+ c"
#            if c < 0, prints "- c"
#            if c == 0, prints ""
#            POWER: if p == 0, prints c
#            if p == 1, prints x
#            otherwise prints x^p
def prcoeff(c, p):
    # as described in lead comment
    if c == 0:
        pass
    elif p == 0:
        # print coefficient only
        print "%d" % (c),
    elif p == 1 and c > 0:
        # don't print exponent
        print "+ %dx" % (c),
    elif p == 1 and c < 0:
        # don't print exponent
        print "- %dx" % (c),
    elif c == -1:
        # don't print coefficient of 1
        print "- x^%d" % (p),
    elif c < 0:
        # print it all neatly
        print "- %dx^%d" % (abs(c),p),
    elif c == 1:
        # don't print coefficient of 1
        print "+ x^%d" % (p)
    else:
        # print it all neatly
        print "+ %dx^%d" % (c,p),

# Main routine to enable us to test fact()
def main():
    # get the input
    c, p = input("[[WARNING: numbers only!]] coefficient, power: ")
    # loop until quit
    while p >= 0:
        # say what you got so user can check
        print "coefficient %d, power %d, term" % (c, p)
        prcoeff(c, p)
        print " "
        # get another input
        c, p = input("[[WARNING: numbers only!]] coefficient, power: ")
    # all done! say what user typed
    print "Quitting: c =", c, "p =", p

main()