# Test file
# Matt Bishop, February 27, 2012
# ECS 10, Winter Quarter 2012

# 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), end=' ')
    elif p == 1 and c > 0:
        # don't print exponent
        print("+ %dx" % (c), end=' ')
    elif p == 1 and c < 0:
        # don't print exponent
        print("- %dx" % (c), end=' ')
    elif c == -1:
        # don't print coefficient of 1
        print("- x^%d" % (p), end=' ')
    elif c < 0:
        # print it all neatly
        print("- %dx^%d" % (abs(c),p), end=' ')
    elif c == 1:
        # don't print coefficient of 1
        print("+ x^%d" % (p))
    else:
        # print it all neatly
        print("+ %dx^%d" % (c,p), end=' ')

# Main routine to enable us to test fact()
def main():
    # get the input
    c = int(input("[[WARNING: numbers only!]] coefficient: "))
    p = int(input("[[WARNING: numbers only!]] power (<0 quits): "))
    # 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 = int(input("[[WARNING: numbers only!]] coefficient: "))
        p = int(input("[[WARNING: numbers only!]] power (<0 quits): "))
    # all done! say what user typed
    print("Quitting: c =", c, "p =", p)

main()