code problems

[bbm007]

I reworked some of the problems by making A,B,C int but am now running into math domain errors
code

import math
equation = []
operation_chosen = input("type of quadratic")
if operation_chosen == "standard form":
    e = input("enter equation")
    
    for i in e:
        equation.append(i)
    numbers = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']
    operations = ['+', '-']
    a = []
    b = []
    c = []
    print(equation)
    operation = []
    x = 0

    while 'x' in equation:
        if equation[equation.index('x') + 1] == '^':
            del equation[equation.index('x') + 2]
            del equation[equation.index('x') + 1]
            del equation[equation.index('x')]
        else:
            del equation[equation.index('x')]
    
    print(equation)
    while x < len(equation):
        if equation[x] in operations:
            operation.append(x)
        x += 1
    
    print(operation)
    for i in range(operation[0]):
        a += equation[i]
    for i in range(operation[0], operation[1]):
        b += equation[i]
    for i in range(operation[1], len(equation)):
        c += equation[i]
    
    while '+' in b:
        del b[b.index('+')]
    while '-' in b:
        del b[b.index('-')]
    while '+' in c:
        del c[c.index('+')]
    while '-' in c:
        del c[c.index('-')]
        
    A = ''.join(a)
    B = ''.join(b)
    C = ''.join(c)
    a2 = int(A)
    b2 = int(B)
    b3 = math.pow(b2, 2)
    c2 = int(C)
    print(a)
    print(b)
    print(c)
    print(A)
    print(B)
    print(C)
    print(a2)
    print(b2)
    print(b3)
    print(c2)
    anser = (-b2 + math.sqrt(b3-4*a2*c2)/2*a2)
    print(a)
    print(b)
    print(c)
    print(A)
    print(B)
    print(C)

I don't think this parsing code works quite right either.

    for i in e:
        equation.append(i)
    numbers = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']
    operations = ['+', '-']
    a = []
    b = []
    c = []
    print(equation)
    operation = []
    x = 0
 
    while 'x' in equation:
        if equation[equation.index('x') + 1] == '^':
            del equation[equation.index('x') + 2]
            del equation[equation.index('x') + 1]
            del equation[equation.index('x')]
        else:
            del equation[equation.index('x')]
     
    print(equation)
    while x < len(equation):
        if equation[x] in operations:
            operation.append(x)
        x += 1
     
    print(operation)
    for i in range(operation[0]):
        a += equation[i]
    for i in range(operation[0], operation[1]):
        b += equation[i]
    for i in range(operation[1], len(equation)):
        c += equation[i]
     
    while '+' in b:
        del b[b.index('+')]
    while '-' in b:
        del b[b.index('-')]
    while '+' in c:
        del c[c.index('+')]
    while '-' in c:
        del c[c.index('-')]

I don't see where "-" has any affect on the results. x^2 - x -10 is evaluated the same as x^2 + x + 10

You should rethink your approach.

deanhystad write Apr-20-2023, 07:47 PM:
Please wrap code in python tags to retain proper indenting.

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