Could someone explain to me why this is the answer to this one question?

Question

Question:
What is the output of this code?
int x = 8;
System.out.print(++x * 3 + "" + x);

Answer: 279
How is the answer to this 279..? Wouldnt it just be 32?

Answer 1

Hello. The ++ is a precedent operator. Before 'x' is used, it gets an increment.

So, ++x turns x in 9. Now, 9 * 3 equals 27.

In the print, the string is concatenating the values 27 + "" + x. And x is 9 due to the incrementation. Since "" was used just to separate 27 + x (which would get a sum here) they're just separate values being put together one after another. Thus, 279.

Hope it helps :)

Answer 2

Breno Wilson Ah thankyou! It all makes sense to me now :)
Although I thought ++x wouldnt be counted in until after the line? I probably need to go revisit that chapter.

Answer 3

When a math is being doing, you need to solve it before printing.

++ (or --) has priority above multiplication and division.

The catch is that the '+' from "" + x or 3 + "" isn't a sum, but a concatanation since you're "summing up" a string data with a number data (an integer in that case). You must pay attention to recognize that.

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