Python_鸡兔同笼

def fa1(h, f):
    #设鸡c只 兔r只
    if(h > 0 and f >0 and h % 2 == 0 and f % 2 == 0):
        r = f / 2 - h
        c = h - r
        print("鸡{0}只 兔{1}只".format(c, r))
    else:
        print("无解请重新测试")

def fa2(h, f):
    if(h > 0 and f >0 and h % 2 == 0 and f % 2 == 0):
        for c in range(h):
            r = h - c
            if(c * 2 + r * 4 == f):
                print("鸡{0}只 兔{1}只".format(c, r))


    else:
        print("无解，请重新测试")



def main():
    h = int(input("请输入一只笼子中的动物总数："))
    f = int(input("请输入总脚数："))

    fa1(h, f)
    fa2(h, f)

main()