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shifting

 
Greenhorn
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hi all,
plzz try this,
(Q1)
5<<32 results 5
5<<-32 results 5
5<<33 results 10
these are ok but
plzz explain this,
5 << -33 results -2147483648 i.e the lowest boundry of int datatype.
(Q2)
plzz explain
-1 >> 1 results -1 not 0
 
Ranch Hand
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Hi Nadeem,
Only 5 bits of the right operand are used the reason is that an int is a 32-bit value and can only be shifted 0 through 31 times.
Now see 5 << -33
-33 divided by 32 gives -1 (i assume you know the reason)
-1 in binary is 111111111111111111111111111111111
take only 5 bits it's now 11111 and equals 31 in decimal
given question becomes 5<<31 I think you know the rest.
second question is -1>>1 and sure it'll give -1 the reason is right shift is a signed operator i.e it preserves the sign.
the bits that fill in the shifted left bits have the value of the leftmost bit(before the shift operation).
 
Nadeem Malik
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Thanx Nasir Khan,
i am now satisfied.
 
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hi!
i am looking for source of binary arithmetics conception and examples
higly appreciate any help in advance
 
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Just do a search for binary addition or subtraction on one of the search engines. (Yahoo, Altavista, etc)
 
Ranch Hand
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I have some info for shift/bitwise operations on my page.
Check the tips page at
http://www.geocities.com/velmurugan_p
Hope this helps.
------------------
Velmurugan Periasamy http://www.geocities.com/velmurugan_p/
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
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