python学习之二次方程求解

主体设计
二次方程求解流程图：

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开始

用户输入二次项系数A一次项系数B及常数C

利用二次方程求根公式

输出结果

结束

二次方程求解具体可以通过3个步骤实现：
step1:调用input（）函数，要求用户输入二次项系数A，一次项系数B及常数C；
step2:利用求根公式，计算出二次方程的结果，并用S1和S2记录
step3:调用print()和format()函数对结果进行输出。

功能实现：
1.调用input()函数，输入二次项系数A，一次项系数B及常数C

#导入数学计算的模块
import cmath
#输入相关数据
A = float(input('输入二次项系数A：'))
B = float(input('输入一次项系数B：'))
C = float(input('输入常数C: '))

2.利用二次方程求根公式计算出结果，并记录

#利用求根公式计算结果
D = (B ** 2) - (4 * A * C)
S1 = (-B - math.sqrt(D)) / (2 * A)
S2 = (-B + math.sqrt(D)) / (2 * A)

3.输出结果：

#输出计算结果
print(A, 'x^2+', B, 'x+', C, '=0的结果为{0} 和 {1}'.format(S1,S2))

结果为：
输入二次项系数A：123
输入二次项系数B：110
输入常数C：23
123.0 x^2+ 110.0 x+ 23.0 =0的结果为-0.5609756097560976 和 -0.5609756097560976

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