大学计算机基础大学计算机基础 (20).ppt

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1、Binary arithmetic and logical operationsArithmetic operation of binary number 1 0 1 1 1 1 0 1-1 1 0 0 0+The calculation process of 1011B+1101B is as followsArithmetic operation of binary numberThe calculation process of 11000B-1101B is as follows：1 1 0 1 1 1 1 0 1-1 1 1 0-Arithmetic operation of bin

2、ary numberNOT！ANDORXOR$Operation rules of NOTA!A1001Operation rules of ANDABAB000010100111We usually use“”or“”to express the operation AND.When logical values A and B are true,the operation result of AND is true,otherwise the result is false.Operation rules of ANDOperations of AND are similar to ser

3、ies circuit,When the two switches in the series circuit are closed(true),the circuit is on and the light is on(true).A BPower supplybulbOperation rules of ORWe usually use+or to represent the operation OR.When one of the logic values A of and B is true,the operation result of OR is true.Only when bo

4、th A and B are false,the result is false.ABAB000011101111Operation rules of ORThis operation is similar to the parallel circuit.As long as one of the two switches in the parallel circuit is closed(true),the circuit will be on and the light will be on(true).bulbPower supplyABOperation rules of XORWe usually use to represent the operation of XOR.When logical values a And B are the same,their operation result of XOR is false;when the two logical values are different,the result is true.ABAB000011101110