Need decimal guidance on a pro quiz C++

Question

Hello, I am new to C++ and I am going through the lessons but need help figuring out this quiz.

On the C++ pro quizzes in the conditional and loops section and subsection “The do... while loop” has a pro quiz called “Who doesn’t love a discount”

All my outputs are correct except the first one. In one of the computers Inputs is 6930 where the expected output is 1039.5 but my code only outputs 1039 so it’s marking only that one wrong and all the rest are correct. So I’m missing the .5 and the lessons prior does not explain how to make sure the math goes to the next decimal.

Here is the scenario:

A supermarket has launched a campaign offering a 15% discount on 3 items.
Write a program that takes the total price for every purchase as input and outputs the relevant discount.

https://code.sololearn.com/cZRznQHFnElV/?ref=app

Answer 1

try:
#include <iomanip>
and
cout << setprecision(2);
Also you need to use float (or double);
Have they given an example input and output?

Answer 2

Thank you. What worked from what you told me was double. The lessons did not go over those yet so i did a google search on how to use double. So i used it inplace of my int variable and it works. All are correct now. Thank you again!