python中输入提示_python - 在python中显示输入提示 - 堆栈内存溢出

方程X ^ 2 + 2x + 3 = 0没有真正的解决方案。当您尝试取b * b-4 * a * c平方根时，会出现ValueError ，这是负数。 您应该以某种方式处理此错误情况。 例如，尝试/除外：

import math

def main():

print "This program finds the real solution to a quadratic"

print

a, b, c = input("Please enter the coefficients (a, b, c): ")

try:

discRoot = math.sqrt(b * b-4 * a * c)

except ValueError:

print "there is no real solution."

return

root1 = (-b + discRoot) / (2 * a)

root2 = (-b - discRoot) / (2 * a)

print

print "The solutions are: ", root1, root2

main()

或者您可以提前检测到判别为负：

import math

def main():

print "This program finds the real solution to a quadratic"

print

a, b, c = input("Please enter the coefficients (a, b, c): ")

discriminant = b * b-4 * a * c

if discriminant < 0:

print "there is no real solution."

return

discRoot = math.sqrt(discriminant)

root1 = (-b + discRoot) / (2 * a)

root2 = (-b - discRoot) / (2 * a)

print

print "The solutions are: ", root1, root2

main()

结果：

This program finds the real solution to a quadratic

Please enter the coefficients (a, b, c): 1,2,3

there is no real solution.

最后

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