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2011-02-01T09:35:10.073
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Basic stuff first: <ul> <li>The only combination of bits that means false is 00000000 all the others mean true i.e: 00001000,01010101</li> <li>00000000 = 0(decimal), 00000001 = 2^0, 00000010 = 2^1, 00000100 = 2^2, …. ,10000000 = 2^7</li> <li>There is a big difference between the operands (&&, ||) and (&,|) the first ones give the result of the logic operation between the two numbers, for example: 00000000 && 00000000 = false, 01010101 && 10101010 = true 00001100 || 00000000 = true, 00000000 || 00000000 = false The second pair makes a bitwise operation (the logic operation between each bit of the numbers): 00000000 & 00000000 = 00000000 = false 00001111 & 11110000 = 00000000 = false 01010101 & 10101001 = 00000001 = true 00001111 | 11110000 = 11111111 = true 00001100 | 00000011 = 00001111 = true</li> </ul> <hr> To work with this and play with the bits, you only need to know some basic tricks: <ul> <li>To set a bit to 1 you make the operation | with an octet that has a 1 in that position and ceros in the rest.</li> </ul> For example: we want the first bit of the octet A to be 1 we make: A|00000001 <ul> <li>To set a bit to 0 you make the operation & with an octet that has a 0 in that position and ones in the rest.</li> </ul> For example: we want the last bit of the octet A to be 0 we make: A&01111111 <ul> <li>To get the Boolean value that holds a bit you make the operation & with an octet that has a 1 in that position and ceros in the rest.</li> </ul> For example: we want to see the value of the third bit of the octet A, we make: A&00000100, if A was XXXXX1XX we get 00000100 = true and if A was XXXXX0XX we get 00000000 = false;
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1. POAre bitwise operations going to help me to serialize some bools?
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1. USDavid Darias
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