Josef Buchko - 4 months ago 22

Python Question

I am trying to make a program that converts standard form quadratic equations to factored form using the quadratic formula, but I'm getting an error on the part where I begin to do math. It seems like it has a problem with the floats I am using, but I do not know why, nor do I know how to fix it.

This is the error I get:

`Traceback (most recent call last):`

File "C:\Users\Josef\Documents\Python\standardFactored.py", line 25, in <module>

rightS = b^2-4*a*c

TypeError: unsupported operand type(s) for ^: 'float' and 'float'

Here's the code:

`print("This program will convert standard form quadratic equations to "`

"factored form. ax^2+bx+c --> a(x+ )(x+ )")

while True:

try:

a = float(raw_input("a = "))

break

except:

print("that is not a valid number")

while True:

try:

b = float(raw_input("b = "))

break

except:

print("that is not a valid number")

while True:

try:

c = float(raw_input("c = "))

break

except:

print("that is not a valid number")

rightS = b^2-4*a*c

try:

math.sqrt(rightS)

except:

("There is no factored for for this equation")

quit()

Answer

The `^`

operator probably doesn't do what you expect. It's a binary XOR, or e**X**clusive **OR** operator. The XOR operator doesn't work with floating point numbers, thus producing the error. The error basically says it can't do the operation on two floats. With exponents, use a double asterisk. See the Python operators here.

Example, a to the power b is:

```
a ** b
```

In your case, it would be:

```
rightS = b ** 2 - 4 * a * c
```