BC73 计算一元二次方程

思路：

step1：按照要求输入输出；

代码如下：

while True:
    try:
        a,b,c = list(map(float,input().split()))
        if int(a) == 0:
            print('Not quadratic equation')
        else:
            delta = b**2 - (4*a*c)
            if delta == 0:
                print('x1=x2={:.2f}'.format(-b/(2*a)+0.00000000001))
            elif delta > 0:
                x1 = ((-b)+delta**0.5)/(2*a)
                x2 = ((-b)-delta**0.5)/(2*a)
                if x1 > x2:
                    x1,x2 = x2,x1
                print('x1={:.2f};x2={:.2f}'.format(x1+0.000000001,x2+0.0000000001))
            elif delta < 0:
                m1 = (-b)/(2*a)
                n1 = ((-(delta))**0.5)/(2*a)
                if float(m1) == 0.00:
                    m1 = 0.00
                if n1 >= 0:
                    print('x1={:.2f}-{:.2f}i;x2={:.2f}+{:.2f}i'.format(m1+0.000000001,n1+0.0000000001,m1+0.000000001,n1+0.0000000001))
                else:
                    print('x1={:.2f}{:.2f}i;x2={:.2f}+{:.2f}i'.format(m1+0.000000001,n1+0.0000000001,m1+0.000000001,-(n1+0.0000000001)))
    except:
        break