Printable View
public class Class {
public static void main(String[] args)
{
for(int i = 1; i <= 100; i++)
{
System.out.print((i^2) + ",");
}
}
}
so i got that code, what does the carrot sign do in java, cause that sure as hell doesn't print out the squares of i...
ok, i sorta figured out what ^ does, it performs what is called bitwise exclusive or, i read some stuff on what that does and was confused...
It manipulates the bits. You see, all numbers in computers are in binary. The number 177, for example, is in binary
10110001
The bitwise operators <<, >>, >>>, ^, &, | and ~ manipulate numbers of the bit level. ~ simply inverts all bits:
~10110001 = 01001110
<<, >> and >>> shift the bits:
10110001 << 3 = 10001000
>> and >>> shift to the right instead of left. They differ in the way new bits get inserted on the left, but I forgot which is which.
&, ^ and | perform bitwise logical operations: & is AND, ^ is XOR and | is OR.
10110001 &
01100101 =
00100001
so only where both operands have 1 has the result 1. OR means where either have 1:
10110001 |
01100101 =
11110101
and XOR where either, but not both (exclusive or):
10110001 ^
01100101 =
11010100
Ok, for simple powers like square you usually write it in multiplications: x^2 = x*x.
For more complicated powers, you use the Math.pow function.
For the ~ operator you can do some simple binary manipulation to turn neg nums to positive and visa versa.
neg to pos (-n == ~n +1)
-484 = 10 0001 1100
01 1110 0011 = 483
483 + 1 = 484
pos to neg (n == ~n +1)
484 = 01 1110 0100
10 0001 1011 = - 485 + 1 = - 484
same formula applies.....
pos to neg ((n-1) ~n == (-n))
484 - 1 = 483
483 = 01 1110 0011
-484 = 10 0001 1100
Yeah, but - does it too :)
Yes but then all the fun would be taken out. :lol:Quote:
Posted by CornedBee
Yeah, but - does it too :)