数学域误差二次公式

Question

找出了除上一个错误以外的错误，我现在收到此错误消息，无法弄清原因，我使用的是我老师给我们使用的x1和x2的确切公式，而我却无法找出错误。

    # Quadratic Formula

# Import the math library to use sqrt() function to find the square root
import math

print("This equation solves for x in the binomial equation: ax^2 + bx + c = 0")

# Get the equation's coefficients and constant from the user
a = 0
while a == 0:
    try:
        a = float(input("Enter the first coefficeint, or a, value:  "))
        if a == 0:
           raise ValueError
    except ValueError:
        print("The value you entered is invalid. Zero is not allowed")
    else:
            break
while (True):
    try:
        b = float(input("Enter the Second coefficeint, or b, value:  "))
    except ValueError:
            print("The value you entered is invalid. only real numbers")
    else:
            break
while (True):
    try:
        c = float(input("Enter the last coefficeint, or c, value:  "))
    except ValueError:
            print("The value you entered is invalid. only real numbers")
    else:
            break
d = (b**2) - (4*a*c)
x1 = ((-b) + math.sqrt(b**2 - 4*a*c)) / (2*a) 
x2 = ((-b) - math.sqrt(b**2 - 4*a*c)) / (2*a)
print("X is: ", x1, " or ", x2)
do_calculation = True
while(do_calculation):
         another_calculation = input("Do you want to perform another calculation? (y/n):")
if(another_calculation !="y"):

该方程式可求解二项式方程式中的x：ax ^ 2 + bx + c = 0输入第一个coefficeint或a值：2输入第二个coefficeint或b值：3输入最后一个coefficeint或c值：4追溯（最近一次通话最近）：文件“ /Users/cadenhastie/Downloads/Jtwyp6QuadraticEqnCalc/improvedquadraticeqncalc.py”，第34行，x1 =（（-b）+ math.sqrt（b ** 2-4-* a * c））/（2 * a）ValueError：数学域错误

Answer 1

您有try语句，没有相应的except语句。 通常应避免使用while True: 您代码中的缩进有很多问题

为了通过错误处理从用户那里获得一个价值，您可以执行以下代码。 然后，您要为用户输入的每个系数重复此操作。 您可能希望在某个时候将其包装在函数中，这样就不会编写重复的代码。

a = 0 while a == 0: try: a = float(input("Enter the first coefficeint, or a, value: ")) if a == 0: raise ValueError except ValueError: print("The value you entered is invalid. Zero is not allowed")