Bitwise Operations in C: setting bits from left -


given integer 10, how write 10 1 bits (starting left) in total of 16 bits so:

11111111.11000000

or given integer 4, write:

11110000.00000000

thanks, i'm still learning c , not familiar bitwise operations.

-(1 << wordsize - numbits) ought it.

it's instructive see happens in example. 1 << wordsize - numbits 1 << 12, 00010000.00000000. recalling -x = ~x+1, compute ~(1 << 12) = 11101111.111111. add 1 , 11110000.00000000.


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