Arithmetic operation | Java Community | Help. Code. Learn. | Page 1

iron topaz May 16, 2023, 6:54 AM

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I'm trying to learn Java basics in an app, and while i've been doing fine understanding how the arithmetic itself works this code example they provided confused me a bit.

int x = 10
int y = x - 5; // y will equal 5
y = x / 4; // y will equal 2
y = x * 4; //y will equal 8
y = x % 3; // y will equal 1

My question is if int y = x - 5 is equal to 5, shouldnt the next declaration be 5/4 = 1.25 which is 1 instead of 10/4 = 2? Why does x still apply to the first line of y without the int declaration but the next two use the previous answer of y? This question is worded a bit weird, sorry about that.

"Why is it y = 10 / 4 instead of y = 5 / 4"

austere shadowBOT May 16, 2023, 6:54 AM

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pale rampart May 16, 2023, 6:57 AM

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A good way to read it is from right to left... So I would read the second line as follows:
calculate x - 5, which is 10 - 5 = 5. Take this value and store it in the variable y

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x is not modified

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Sorry i meant right to left

iron topaz May 16, 2023, 7:00 AM

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pale rampart `x` is not modified

So how come once it reaches y = x / 4 it then uses that answer for the next equation y = x * 4

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and then does the same for the last one

pale rampart May 16, 2023, 7:02 AM

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Im not sure where you got those outputs in your comments

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I just ran the code and here are the results:

(x / 4) = 2
(x * 4) = 40
(x % 3) = 1

iron topaz May 16, 2023, 7:03 AM

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Its possible its an error in the writers explanation, i can send the app and the reference

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pale rampart May 16, 2023, 7:04 AM

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That comment on the line y = x * 4; is incorrect

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Everytime you say y = something you are overwriting what was already in y

iron topaz May 16, 2023, 7:06 AM

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It doesn’t actually explain that part, but in other languages i’ve learned theg don’t use the int, string etc declarations for variables so i was wondering if that made a different in the code execution but this is good to know i wasn’t losing my mind lol thank you

austere shadowBOT May 16, 2023, 7:06 AM

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iron topaz It doesn’t actually explain that part, but in other languages i’ve learned theg ...

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pale rampart May 16, 2023, 7:06 AM

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In java you need to include the variable type when declaring it for the first time

#Arithmetic operation