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pls explain?

 
Greenhorn
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byte i= (byte)129;
System.out.println(i);

output: -127 why?
can anyone explain?
 
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As an int, 129 has the following bit representation

00000000000000000000000010000001

When you cast to a byte, you only have the last 8 bits.

So you have the byte

10000001

Because the first bit is a 1, this is a negative number.

To find out what number it is the negative of, flip all the bits and add 1

You get

01111111

So the number is -127.
 
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Good Keith!!!



Thanks,
cmbhatt
 
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