Paint Costs

Question

I was doing the community challenge, Paint costs, and ran into some trouble.
My code passed two out the four test cases, I want to k own why it did not pass the other two test cases.
https://code.sololearn.com/c50yiqx9nH51/?ref=app

Answer 1

the kid next door

The tax defined as int and being rounded gives incorrect values, which fails those test cases. Tax should be float and not rounded.

The final total cost needs to be rounded UP to an integer. Try using the `ceil` function to wrap the expression:

ceil(((colorPick * colorCost) + canvasAndBrushes ) + storeTax);

Answer 2

Mmmh..It is not possible to determine why your code is not passing all test cases without knowing the specific inputs and expected outputs for those test cases anyway one issue with the code is that the storeTax calculation is rounded after dividing by 10, but it should be rounded before dividing by 10. This could result in incorrect store tax amounts and therefore incorrect total costs.

Answer 3

Indeed I agree with Mozzy it is true that the tax is calculated as an integer and rounded which gives incorrect values ​​and fails some test cases, the fee should be a float and not rounded, the final total cost must be rounded up to a whole, try using the "ceil" function to wrap the calculation expression.

Answer 4

I always had a problem with these challenges involving taxes as I live in EU. Anyway, I sligthly changed your solution and it passed all tests.

#include <iostream>
#include<cmath>
using namespace std;

int main() {
int colorPick;
cin >> colorPick;

float canvasAndBrushes=40.00;
float canvasAndBrushesTotal=canvasAndBrushes+canvasAndBrushes*0.1;
float colorCost=5.00;
float colorTotal=colorPick*(colorCost+colorCost*0.1);

int totalCost=round(colorTotal+canvasAndBrushesTotal);

cout << totalCost;
return 0;
}

Answer 5

Yes, Arsenicolupinlll is right in this case. For example, this is my solution in python :D

from math import ceil
paints = int(input())
print(ceil(44+(paints*5.5)))

Another example would be code challange "Digits of Pi". You could simply paste Pi up to 1000 decimal points and output required digit. Whether is good or bad practice - it's not the topic of this discussion. In this case, I think it's neccessary because of requirements of solving this particular challange.

Answer 6

thanks Mateusz and I agree using the "ceil" function to round to the next integer is a correct solution to the problem, I'd like to add that it's very helpful to see the solution in another programming language, like Python, because it helps us better understand the problem and learn new techniques.

Answer 7

we can make mistakes and learn at the same time, we are here to learn knowledge and exchange information

Answer 8

Mirielle you can determine the input of a test case by referring to the problem statement or by looking at sample inputs provided in the question. Sometimes, if you are given access to the code, you can also look at the test cases and the expected output to get an idea of the inputs. Additionally, you can also try to make educated guesses based on the constraints mentioned in the problem statement and test your code with those inputs.