Common bit operations: Get, set, and clear

1/* Common bit operations: Get, set, zeroes 2*3 **/4 public class bitget {5/* 6 * This function provides the retrieval function. 7 * First, 1 is moved to the I bit, and 0 is shifted to 00000001, 8 * and then convert it to binary 00001100 with num decimal 12, 9*00000001 if it is to move two digits to the left, it will be 0000010010*00001100 0000110011 00000000 * -------- 12*0000010013 *, so as to clear all the bits except the I bit. Finally, check whether the result is zero. If 14 * is not zero, it indicates that the I-th bit is 1. Otherwise, it is zero 15 */16 public Boolean getbit (INT num, int I) 17 {18 return (Num & (1 <I ))! = 0); 19} 20/* This function implements the slot function 21 * First Move 1 to the left of the I bit to get the value in the shape of 00001000. Then, bitwise OR 22 * For this value and num will only change the I-th value, the binary code of num other bits 23 * as follows 24*12 is 0000110025 * If 1st bits are set to 26*0000110027*0000001028 * -------- 29*0000111030 *, the second position is 1, the rest will remain unchanged 31 **/32 public int setbit (INT num, int I) 33 {34 return num | (1 <I ); 35} 36/* 37 * This function implements the zeroth function 38 * This method is just the opposite of setbit. First, Move 1 to the left of the I bit, then obtain the mask 39 * For this value, and then perform bitwise AND operation on the mask and num. This will only reset the I bit of num, the remaining BITs remain unchanged 40 * as follows 4 The binary value of 1*12 is 0000110042 * assume that the number of digits to be cleared is 43*1. move 1 to the left and get 0000100044*2. returns 1111011145x3. bitwise and operation 46*1111011147*0000110048 * -------- 49*0000010050 * can be obtained, only the third bit is cleared, and other values remain unchanged 51 **/52 public int clearbit (INT num, int I) 53 {54 int mask = ~ (1 <I); 55 return num & mask; 56} 57 public static void main (string [] ARGs) {58 // todo auto-generated method stub59 bitget BG = new bitget (); 60 Boolean flag = BG. getbit (12, 3); 61 system. out. println (FLAG); 62 int value = BG. setbit (12, 1); 63 system. out. println ("1st bits:" + value); 64 value = BG. clearbit (12, 3); 65 system. out. println ("Reset 3rd bits:" + value); 66 67} 68 69}

 

Common bit operations: Get, set, and clear