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# What is i%2?? Why x is 9 and y is 6?

int x=0, y=0; for (int i=0; i<=5; i++) if (i%2==0) for (int j=0; j<5; j++) if (j%2==0) x++; else y++; Qual `e il valore finale delle variabili x e y? x = 9, y = 6

24th Jan 2020, 1:33 PM
Ivan Ferro
4 Respuestas
+ 3
Ivan Ferro i % 2 gets 0 for even numbers. Because every even number is divisible by 2. First loop runs from 0 to 5. even i's: 0, 2, 4 Second loop rums from 0 to 4. even j's 0, 2, 4 i = 0 -> increment x when j = 0 or 2 or 4 //3 times: x gets 3 Same for i = 2 //x gets 6 Same for i = 4 //x gets 9 i = 0 -> increment y when j = 1 or 3 //2 times: y gets 2 Same for i = 2 //y gets 4 Same for i = 4 //y gets 6 For i = 1, 3 or 5 the second loop will not start. Nothing happens with x or y.
24th Jan 2020, 3:03 PM
Denise Roßberg
+ 3
Ivan Ferro Your welcome :) I recommend using curly brackets. for(int i = 0; i <= 5; i++){ if(i % 2 == 0){ for(int j = 0; j < 5; j++){ if(j % 2 == 0){ x++; }else{ y++; } }//end second loop }//end first if }end first loop The curly brackets creates blocks. Everything inside a block belongs together. Over time you will learn which ones you really need and which ones you can leave out. But for me when I started to learn java it was helpful to use them for every loops/if statements
24th Jan 2020, 3:34 PM
Denise Roßberg
+ 1
Denise Roßberg Thank you, now i understand!
24th Jan 2020, 3:22 PM
Ivan Ferro
0
% it is modulo division. The result of this is the rest of the division. Now try again, what happens here, and count x and y. If you get stuck then let me know.
24th Jan 2020, 2:18 PM
JaScript
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