Duct Tape problem in C

Question

Plz check once
Only last case fails
https://code.sololearn.com/cniu7w9t9ll2/?ref=app

Answer 1

Wakil Ahmad Hamidi
No, leave the code just like it was before, with the floats. Just add the .5 to the area.

scanf("%f%f", &height, &width);
area = height*width/5+.5;
printf("%.f", area);

Answer 2

Scott D
Okay, got it.
Thanks for clarifying

Answer 3

Wakil Ahmad Hamidi
"Output Format:
An integer that represents the total rolls of duct tape that you need to buy."

Integer, not float. So the problem is maybe that using %.f is rounding down to the closest integer, not up.

Try area = height*width/5+.5;

Also, float tape = 5 is an unused variable so you don't need it, or you could use something like:
area = height*width/tape+.5;

That might be better since it makes the code more descriptive.

And, not really important, but you don't need to assign a value to area:
float height, width, area;

Answer 4

Scott D

Do you mean like this:

#include <stdio.h>

int main() {

int height, width, area;

scanf("%d%d", &height, &width);
area = height*width/5+.5;
printf("%d", area);
return 0;
}

For this 2nd case is also wrong including the previous last one

Answer 5

Scott D
But in your prevoius reply you confused me, you said int type
But all what was required adding .5 to 5 (height*width/5+.5)
The question is why we add this .5, what is its logic?

Answer 6

Wakil Ahmad Hamidi
Sorry about the confusion, I guess I wasn't specific enough. I'd have to look it up to be sure, but I think when you use the float with the dot %.f it's rounding down to the nearest integer. So if the area was say 30.6 it rounds down to 30 (6 rolls of tape). But if the area was 30.6 you'd need 7 rolls. Adding .5 would make the area 31.1 So you'd now have enough tape.

Answer 7

What is this 🧐