I'm out of patience and ideas. Can somebody tell me why the following code gives the
output it does. The programme should take a given long number, shift it 8 bits each
way (signed and unsigned), and print all the different bit-patterns. As I see it, one
of two things is happening.
1. There's a bug in the JDK and bitwise operators don't work properly, which
seems unlikely.
2. The dprint function is not printing the actual bit-strings but I can't see why.
<code>
public class pubtest
{
public static void main(String args[])
{
long n;
n=0xf0f0f0f0;
System.out.print("n:\t");
dprint(n);
System.out.print("n>>8:\t");
dprint(n>>8);
System.out.print("n>>>8:\t");
dprint(n>>>8);
System.out.print("n<<8:\t");
dprint(n<<8);
n=0x0f0f0f0f;
System.out.print("n:\t");
dprint(n);
System.out.print("n>>8:\t");
dprint(n>>8);
System.out.print("n>>>8:\t");
dprint(n>>>8);
System.out.print("n<<8:\t");
dprint(n<<8);
}
private static long dprint(long l)
{
for(int i=1<<31; i!=0; i>>>=1)
System.err.print((l&i)!=0?"1":"0");
System.err.print("\n");
return l;
}
}
</code>
<output>
n: 11110000111100001111000011110000
n>>8: 11111111111100001111000011110000
n>>>8: 11111111111100001111000011110000
n<<8: 11110000111100001111000000000000
n: 00001111000011110000111100001111
n>>8: 00000000000011110000111100001111
n>>>8: 00000000000011110000111100001111
n<<8: 10001111000011110000111100000000
</output>
Cheers,
J.
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www: http://www.elephant.org/~azazel/
mail: [EMAIL PROTECTED]
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