Games in java

[Fernando hiar]

I want to know, I have a game in java about the snake, I have snake with 40 Points and I put all points in a variable called MAX_POINT who is the body the snake and the tail I´ll put inside the variable i = tail of snake. I want to know What´s this expression does: i = (i+1) % MAX_POINTS in the JPanel I know i will increment the tail point and one, but why need to take a rest of division in the body of snake, I have this doubt.

Thank you,

Freakjar.

[salvin francis]

Fernando hiar wrote: I´ll put inside the variable i = tail of snake.

What value does 'i' hold ? I am not able to understand...

[Fernando hiar]

Fernando hiar wrote:I want to know, I have a game in java about the snake, I have snake with 40 Points and I put all points in a variable called MAX_POINT who is the body the snake and the tail I´ll put inside the variable i = tail of snake. I want to know What´s this expression does: i = (i+1) % MAX_POINTS in the JPanel I know i will increment the tail point and one, but why need to take a rest of division in the body of snake, I have this doubt.

Thank you,

Freakjar.

The value is an int, i´ll put a body snake inside of array e I have a variable tail and the head the rest is the body I´ll put a variable tail in i and I did the expression, I want to know what´s this expression does: i = (i+1) % MAX_POINTS, the max points is the body snake and i is the tail snake..... i want to know because I get the rest of division, but what´s behave in the JPanel this expression.

[salvin francis]

lets take a simple example:

class Test
{
		public static void main(String args[])
		{
			int i;
			int MAX_POINTS =40;
			
			for(int n=0;n<=MAX_POINTS;n++)
			{
				i=n;
				System.out.println("I was initially "+i);
				i = (i+1) % MAX_POINTS;
				System.out.println("Now, I am "+i);
			}
			
		}
	
}

output

I was initially 0
Now, I am 1
I was initially 1
Now, I am 2
I was initially 2
Now, I am 3
I was initially 3
Now, I am 4
I was initially 4
Now, I am 5
I was initially 5
Now, I am 6
I was initially 6
Now, I am 7
I was initially 7
Now, I am 8
I was initially 8
Now, I am 9
I was initially 9
Now, I am 10
I was initially 10
Now, I am 11
I was initially 11
Now, I am 12
I was initially 12
Now, I am 13
I was initially 13
Now, I am 14
I was initially 14
Now, I am 15
I was initially 15
Now, I am 16
I was initially 16
Now, I am 17
I was initially 17
Now, I am 18
I was initially 18
Now, I am 19
I was initially 19
Now, I am 20
I was initially 20
Now, I am 21
I was initially 21
Now, I am 22
I was initially 22
Now, I am 23
I was initially 23
Now, I am 24
I was initially 24
Now, I am 25
I was initially 25
Now, I am 26
I was initially 26
Now, I am 27
I was initially 27
Now, I am 28
I was initially 28
Now, I am 29
I was initially 29
Now, I am 30
I was initially 30
Now, I am 31
I was initially 31
Now, I am 32
I was initially 32
Now, I am 33
I was initially 33
Now, I am 34
I was initially 34
Now, I am 35
I was initially 35
Now, I am 36
I was initially 36
Now, I am 37
I was initially 37
Now, I am 38
I was initially 38
Now, I am 39
I was initially 39
Now, I am 0
I was initially 40
Now, I am 1

as you might understand, the i value increments itself... but when it crosses MAX_POINTS - 1, it returns to 0

a similar output is seen when changing the expression to:

i = i % MAX_POINTS;

output:

I was initially 0
Now, I am 0
I was initially 1
Now, I am 1
I was initially 2
Now, I am 2
I was initially 3
Now, I am 3
I was initially 4
Now, I am 4
I was initially 5
Now, I am 5
I was initially 6
Now, I am 6
I was initially 7
Now, I am 7
I was initially 8
Now, I am 8
I was initially 9
Now, I am 9
I was initially 10
Now, I am 10
I was initially 11
Now, I am 11
I was initially 12
Now, I am 12
I was initially 13
Now, I am 13
I was initially 14
Now, I am 14
I was initially 15
Now, I am 15
I was initially 16
Now, I am 16
I was initially 17
Now, I am 17
I was initially 18
Now, I am 18
I was initially 19
Now, I am 19
I was initially 20
Now, I am 20
I was initially 21
Now, I am 21
I was initially 22
Now, I am 22
I was initially 23
Now, I am 23
I was initially 24
Now, I am 24
I was initially 25
Now, I am 25
I was initially 26
Now, I am 26
I was initially 27
Now, I am 27
I was initially 28
Now, I am 28
I was initially 29
Now, I am 29
I was initially 30
Now, I am 30
I was initially 31
Now, I am 31
I was initially 32
Now, I am 32
I was initially 33
Now, I am 33
I was initially 34
Now, I am 34
I was initially 35
Now, I am 35
I was initially 36
Now, I am 36
I was initially 37
Now, I am 37
I was initially 38
Now, I am 38
I was initially 39
Now, I am 39
I was initially 40
Now, I am 0

[Raj kanthrm]

Actually % symbol returns the remainder value. That is, if you put 5%2 means it will return 1. Because the quotient is 2 here and the remainder is 1.
Same way, if you put 2%5 means, you will get 2 as the answer. Because here the quotient is 0 & the remainder is 2. So your (i+1)%MAX_VALUE always return i+1 upto i=38. When i=39, the expression (i+1)%MAX_VALUE becomes (39+1)%40 which is equal to 0. Also when i=40, the result is 41%40=1

Thank you

[Maneesh Godbole]

Raj AbigQuestion wrote:

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