Question

Programming help

Answer 1

what is this?

Answer 2

@vocaloid

Answer 3

im not good at programming, heck i barely passed pltw in 7th and 8th grade

Answer 4

@tranquility

Answer 5

the way you have it set up, the calculations are already written out for s = 5, but the point of this exercise is to let the user decide what the dimensions are and have the program calculate it for them

if you're doing the cube, then you need to ask the user what the side length is, save that as the input, then functions that take the user input and calculate the volume and surface area (you will have to write the given volume and surface area equations in the program)

Answer 6

the basic logic:

side = input("What is the side length of your cube?")
volume = side ** 3
print("The volume is: ", volume)

taking it a step further, you have to make sure the input is converted to a float, and also handles the exception if the user tries to enter something that isn't a number

Answer 7

the idea of the code is that the user inputs what side length they want and the program calculates the volume and surface area

so you need to ask the user what they want the side length to be, and have the program user that side length to do the calculations

Answer 8

ohh ok

Answer 9

side = input("What is the side length of your cube?")
volume = side ** 3
print("The volume is: ", volume)

so where would i add this to my code?

Answer 10

I would personally start over from scratch

in the code, explain to the user the scenario of the problem (John wants to order a rubick's cube, and he wants it to fit on the shelf, etc...) then prompt the user for the side length, then calculate the volume, then print the volume

then write something similar for the surface area calculation

Answer 11

wait

Answer 12

do i ask for the side length on that part of the code

Answer 13

or

Answer 14

this part

Answer 15

almost, the user will be providing the side length, not the volume and SA. the program will be calculating those.

Answer 16

ok so only ask for the side length and remove the volume and sa

Answer 17

and i will add the volume and sa at the end of the whole program

Answer 18

the side length is the main question in this code right

Answer 19

yes

Answer 20

let's look at this again:

side = input("What is the side length of your cube?")
volume = side ** 3
print("The volume is: ", volume)

notice the second line is the volume function V = S^3, written as code.

how would we write one for surface area? remember that * means multiply and ** means an exponent.

Answer 21

also that surface area = 6s^2

Answer 22

this is what i have done so far, am i doing good?

Answer 23

good so far, now you need to do the surface area and it'll be done

Answer 24

actually I'm pretty sure the input function already displays the string on the screen so I don't think you need to repeat the string in the print statement

Answer 25

i think i tried that but the word problem wasnt popping up for the user to read, instead it would only show on the output part of the program if that makes sense..

Answer 26

oh ok then

Answer 27

i want it to show like that

Answer 28

you can leave the repeated strings then

Answer 29

i have a problem with one line

Answer 30

this is line 9

Answer 31

by default input converts to a string, so you need to convert the input to an int or a float

(float is probably better if you want the program to be able to handle non integers)

you can modify the input by writing side = int(input("Prompt")) or float(input("Prompt"))

Answer 32

but is this supposed to happen?

Answer 33

no, you fill in the prompt with the original prompt (asking for side length)

Answer 34

I was just using prompt as a placeholder

Answer 35

OHH

Answer 36

so replace it with

Answer 37

What is the side length of the cube?

Answer 38

yeah

Answer 39

what does this mean?

Answer 40

i typed in "random" when it asked me the side length

Answer 41

line 8: side = int(input("What is the side length of the cube?"))

Answer 42

you have it set up so that it will convert the input to an integer, but you cannot convert the word "random" to a number. if you want to be able to handle a situation where a user enters a non-number, you need to set up a case where the program will tell the user something like "You must enter a number" and repeat the prompt.

Not sure if you've learned about exception handling, your teacher may not be expecting you to be able to program that yet

Answer 43

so what can i enter for it to work

Answer 44

right now

Answer 45

okay let me try

Answer 46

the input has to be a number

Answer 47

okay it worked but

Answer 48

it says theres another error on line 9 which is "print("The volume is: ", volume)"

Answer 49

error: NameError: name 'volume' is not defined on line 9

Answer 50

you need to define the volume variable as volume = side ** 3 before printing volume

Answer 51

okay

Answer 52

like this?

Answer 53

i ran the program and it seems to work fine now

Answer 54

good, be sure to add a surface area calculator (following the same logic as the volume calculator) and you should be set

Answer 55

Okay, i will add that now

Answer 56

works perfectly

Answer 57

its just that is it okay to have "surfacearea" together like that becuase i cant space it like "surface area" i really dont think this matters tho

Answer 58

yes, variables have to be one word, it'll throw a syntax error if you try to make a variable with a space in the name

however, keep in mind the surface area is not s^3, it's 6s^2 which would be 6 * side ** 2

Answer 59

like this?

Answer 60

looks alright to me, do you want to try running it one last time

Answer 61

yes but theres one more thing

Answer 62

I'm not sure what you mean, are you talking about the extra info in paragraph 3?

Answer 63

actually hold on

Answer 64

yes, that last paragraph is showing the output after the user has input all their data

if you want to print out your side length at the end, you simply need to include a line that says

print("A cube with side length ", side, "has volume," volume, " and surface area," surface area") or something like that

Answer 65

where do you think i can add that piece of code?

Answer 66

before volume = side ** 3?

Answer 67

the function you've already written already has the volume and surface area printed at the end, I don't think it's necessary to re-state the radius

Answer 68

oh alright thats fine then

Answer 69

ill just leave it as it is

Answer 70

ill just run this one last time

Answer 71

nice

if you really wanted to re-state the radius, you could simply modify the print statements like so

print("The volume of a cube with side length ", side, "is: ", volume) and similarly for SA, but I think it's fine as is

Answer 72

Yes, this is perfect for me. thank you so much. I would have been so lost without your help lol.