my wrong "halloween candy" solution

Question

Can someone tell me how do You understand this puzzle, and what is wrong in my code.
I wasn't able to understand the given problem in this puzzle. I managed to clear it by messing around with values and Switch.

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

int main() {
int house;
cin>>house;
float houses;
houses=house;
int a,b,c;

//your code goes here
int bills=2;
int tooth=1;
float candy;
/*
if (houses>3){
candy=houses-3;
}
else{
candy=0;
}
*/
switch (house) {
case 51 ... 500:
candy=4;
cout<<candy;
break;

case 2 ... 50:
candy=2/houses*100;
candy=round(candy);
cout<<candy<<endl;
break;
/* case 2:
candy=50;
cout<<candy;
break;
case 1:
candy=0;
cout<<candy;
break; */
default:
candy=1;
cout<<candy;
break;
}
//4=1candy,2bills,1tooth
//5=2candy,2bills,1tooth
return 0;
}

Answer 1

Read your output format, read it carefully 👍👍

Answer 2

/*
I believe you are over thinking. What I do is copy the problem into my code as a comment. This way I don't have to switch back and forth. Also, read the problem carefully and only solve for what they're asking. While your solution may work, you have to remember this is an "easy" challenge, so it should require an easy solution.
*/

#include <iostream>
#include <cmath>

/*
Task
Given the input of the total number of houses that you visited, what is the percentage chance that one random item pulled from your bag is a dollar bill?

Input Format
An integer (>=3) representing the total number of houses that you visited.

Output Format
A percentage value rounded up to the nearest whole number.

Sample Input
4

Sample Output
50
*/

using namespace std;

int main() {
float houses;
cin>>houses;

//your code goes here
cout<<ceil(200/houses);

return 0;
}

Answer 3

but why You used "ceil" and not "round"?
Is it possible to make it work with round()?

Answer 4

I mean, my solution will pass tests, but it's still wrong xD

Answer 5

I get now why I was so confused.
"Rounded up to the nearest whole number"
For 3.2 nearest for me is 3, but for this puzzle You need to round up to 4, they trying to tell You (badly) to use ceil()