java - Why am I getting unexpected output?

Question

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. question from:https://stackoverflow.com/questions/65841208/why-am-i-getting-unexpected-output

Answer 1

Your basic calculation is correct, and for the integer values you provide, the correct output is indeed 560.

Two problems however:

1. If the discount calculates to a floating point number, your result will be incorrect. You need to force the calculation to be a floating point calculation, e.g. like this (note the 100f):

   float amount = total - (total * discount / 100f);
   

2. The assignment asks you to round down if the result is a floating point number. Math.round() doesn't round down, it rounds to the nearest integer. You need to use Math.floor() instead or just cast to int:

   return (int) Math.floor(amount);
   // or
   return (int) amount;