Halloween Candy

Question

Why does this only work on the first two runs?

#include <stdio.h>

int main() {
int houses;
scanf("%d", &houses);

//your code goes here
float p = 200.0 / houses;
float r = p + 0.5;

int s = p;
int t = r;

if(s == t) {
printf("%d \n", t);
}
else {
printf("%d \n", t);
}

return 0;
}

Answer 1

I will give you an example:
The houses in input 4 are 66, p = 200/66 = 3.030303, r = p + 0.5 = 3.53, if you use int () in 3.53 it rounds down, so the result is 3. If you add 0.99 to p, r is 4.02, if you use int in 4.02 the result is 4

PS: In "Halloween Candy" you have to round up
PS: I want to explain better but my english is bad, sorry

Answer 2

Change 0.5 to 0.99 and this work...

Answer 3

Thank you! But what is the cause?

Answer 4

Ah, now I get it! Thank you!

Answer 5

why to add 0.99? can someone explain?