4.2.1 Truth Table(必记) 4.2.2 Unary Operator-NOT Function:Change 1 to 0,0 to 1. Binary Operator-AND Function:Only the comparison both has 1.The result can be 1(positive). 1 1 -> 1 0 1 -> 0 1 0 -> 0 0 0 -> 0 Binary Operator-OR Function:Once there is 1 in the comparison.The result is 1(positive). 1 1 -> 1 0 1 -> 1 1 0 -> 1 0 0 -> 0 Binary Operator-XOR Function:If the pattern 1 and 2 which in the comparison are the same,the result would be 0.Otherwise,the patterns are different would make the result been 1.(Warning:The XOR is not present the directly against with AND.) 1 1 -> 0 0 1 -> 1 1 0 -> 1 0 0 -> 0 4.2.3 Mask Unsetting specific Bits: One of the applications of the AND operator is to unset (Force to 0) specific bits in a bit pattern. The rule for constructing an unsetting mask can be summarized as follows: 1. To unset a bit in the target bit pattern, use 0 for the corresponding bit in the mask. 2. To leave a bit in the target bit pattern unchanged, use 1 for the corresponding bit in the mask. Any question about the following up.Please refer to 4.2.2 operator AND. Setting Specific Bits: One of the application of the OR operator is to set (Force to 1) specific bits in a bit pattern. To do so, use a setting mask with the same bit length. The rules of constructing a setting mask can be summarized as follows: 1. To set a bit in the target bit pattern, use 1 for the corresponding bit in the mask. 2. To leave a bit in the target bit pattern, use 0 for the corresponding bit in the mask. Any question about the following up.Please refer to 4.2.2 operator OR. Flipping Specific Bits:<Most confused application...> One of the application of XOR is to flip bits,which means to change the value of specific bits from 0s to 1s,and vice versa.The rules for constructing an XOR mask can be summarized as follows: 1. To flip a bit in the target bit pattern,use 1 for the corresponding bit in the mask. 2. To leave a bit in the target bit pattern unchanged,use 0 for the corresponding bit in the mask. Any question about the following up.Please refer to 4.2.2 operator XOR. -- ......ID...... ......I am a learning Dancer...... Shake my body through the music... Dance with the Feel... This is my ID...... --

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