> I have the following small programm, and I don't understand why the > number is feeded with ones from the right, but not with > zeros. To elaborate a bit on the other response : this is usually called "sign extended shift right". It preserves the sign of a signed integer, which is stored in the top bit (0 = +ve, 1 = -ve). If you have 2 signed integers, a, and b, such that a = -b, then shift them both x bits right, then it will still be true that a = -b. If the sign bit is not preserved, -ve numbers change into very large +ve numbers after a shift right. For example, for 16 bit signed integers: non sign extended: 11000000 (-64) >>2 ==> 00110000 (48) sign extended: 11000000 (-64) >>2 ==> 11110000 (-16) The first one is correct if the numbers are UNSIGNED, and the first represents +192 rather than -64. > And the next question would be: How can I manage it to get zeros, > instead of ones? As suggested, use unsigned data types. HTH -- Matthew JONES http://www.tandbergtv.com/
