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Some arithmetic problems

Antriksh Verma
Ranch Hand

Joined: Nov 24, 2008
Posts: 56
I faced this problem

int x = -8;
int y = ~-33;
x>>>y;
SOP(x);

1. what is ~ operator ?
2. Please explain >>> operator & its effect here on both x & y ?
3. what is value of y , after ~ .
Keith Rainey
Ranch Hand

Joined: Jan 19, 2011
Posts: 66

Taken from Oracle's Java Tutorial Pages


"The unsigned right shift operator ">>>" shifts a zero into the leftmost position, while the leftmost position after ">>" depends on sign extension."

"The unary bitwise complement operator "~" inverts a bit pattern; it can be applied to any of the integral types, making every "0" a "1" and every "1" a "0". For example, a byte contains 8 bits; applying this operator to a value whose bit pattern is "00000000" would change its pattern to "11111111"."


Keith Rainey
OCPJP6
Steve Luke
Bartender

Joined: Jan 28, 2003
Posts: 4181
    
  21

You can learn about all the operators in Java from This Tutorial. The ~ is a 'bitwise compliment' operator, which inverts the bit-value for each binary bit in a number. The >>> is a a bit shift operator that moves a 0 in to the 'sign bit' (the left bit position) essentially forcing it to be positive.

So what are the effects of these operators? The best way to see that is to convert your numbers to their binary representation then perform the operations by inverting and shifting as appropriate.


Steve
 
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