How does rounding work? Why is my result 0.0 instead of 0.4?

Question

https://code.sololearn.com/cwr3XmHGgJDc/?ref=app

If I put in the input

tomato
2
20

the RoundedSaving output is 0.0 even though it needs to be 0.4.

Without rounding it was 0.399999, so I tried to round it to 0.4 as I wanted the result only correct to two decimal places.

But why is the output for RoundedSaving now 0.0? What can I do to round correctly to two decimal places?

Answer 1

Katharina Hohenfels
Use
double savingRounded = Math.round(saving * 100) / 100.0;

Math.round() returns integer so int/int results int only.. you need atleast a double value like double/int or int/double..

Answer 2

Thank you very much, now I get it!

Answer 3

Dev thank you for your answer, now I understand it better!

Answer 4

You're welcome...

Almost other methods in Math class will return double value, except round() I guess

Answer 5

Jayakrishna🇮🇳 yes you are correct. Because as the name suggests round or roundoff ,for sure it's return type is int

Answer 6

Use Math.floor