Java - Arithmetic Calculations

Question

I have the following code snippet:

public class YourClassNameHere {
public static void main(String[] args) {
double x = 3 / 2 * 3;
System.out.printf("%.1f", x);
   }
}

I do know that 3.0 will be printed. However, why isn't it 4.5?

I thank you for your time and clarifications in advance.

You have to up vote the answer if it is helpfull – Faheem azaz Bhanej Apr 03 '22 at 09:25 — Faheem azaz Bhanej, Apr 03 '22 at 09:25

score 0 · Answer 1 · answered Sep 01 '21 at 04:24

0

I recommend that you have to use proper parenthesis to minimize error double x = (3/2)*3

3\2 gives an integer value i.e 1 and to make it double you have to do (3\2.0) it gives double value i.e. 1.5 then 1.5 * 3 = 4.5

answered Sep 01 '21 at 04:24

Rishabh Jain

174
1
7

Hi Rishabh, thank you for your answer. However, the question I am asking relates to how the calculcations were done to print 3.0 at the end. I thought it was 4.5 as well. – Jerome Quah Sep 01 '21 at 04:25
It depends on operand priorities and associativity – Rishabh Jain Sep 01 '21 at 04:30
The problem is nothing to do with operand priorities or associativity. – Dawood ibn Kareem Sep 01 '21 at 05:17

score 0 · Answer 2 · answered Sep 01 '21 at 04:24

0

Because you are using Ints which will return whole numbers. To get the desired result simply add an "f" suffix to denote that the numbers are floating point:

double x = 3f / 2f * 3f;

answered Sep 01 '21 at 04:24

king jaja

21
5

score 0 · Accepted Answer · answered Sep 01 '21 at 04:26

Your equation is double x = 3 / 2 * 3 and x variable is store double data type but 3 and 2 and 3 is store in integer format...

first you need to convert this number in double then you get right output

example:

public class YourClassNameHere {
   public static void main(String[] args) {
     double a = 3;
     double b = 2;
     double c = 3;
     double x = a / b * c;
     System.out.printf("%.1f", x);
   }
}

score 0 · Answer 4 · answered Sep 01 '21 at 04:28

0

Just got it, it is because 3/2 = 1, in which then 1*3 becomes 3. Thank you all for the replies!

answered Sep 01 '21 at 04:28

Jerome Quah

35
6

Java - Arithmetic Calculations

4 Answers4