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### 15 bitwise operators

• 1. BITWISE OPERATORS • bitwise operators operate on individual bits of integer (int and long) values. • If an operand is shorter than an int, it is promoted to int before doing the operations. • Negative integers are store in two's complement form. For example, -4 is 1111 1111 1111 1111 1111 1111 1111 1100.
• 2. 4/10/2013 Md.Samsuzzaman,Lecturer,Dept of CCE,PSTU 2 Bitwise Operator ~ Bitwise unary NOT & Bitwise AND | Bitwise OR ^ Bitwise XOR >> Shift Right >>> Shift Right zero fill << Shift left & = Bitwise AND Assignment |= Bitwise OR Assignment ^= Bitwise XOR Assignment >>= Shift Right Assignment >>>= Shift Right zero fill Assignment <<= Shift Left Assignment
• 3. 4/10/2013 Md.Samsuzzaman,Lecturer,Dept of CCE,PSTU 3 Bitwise Operator Applied to integer type – long, int, short, byte and char. A B A | B A & B A^ B ~A 0 0 0 0 0 1 0 1 1 0 1 1 1 0 1 0 1 0 1 1 1 1 0 0
• 4. OPERATOR MEANING EXPLANATION EXAMPLE RESULT ~ Bitwise unary NOT This sign is used for inverts all the bits ~42 213 & Bitwise AND Produce a 1 bit if both operands are also 1 otherwise 0 2 & 7 2 | Bitwise OR either of the bits in the operands is a 1, then the resultant bit is a 1 otherwise 0 2 | 7 7 ^ Bitwise exclusive OR if exactly one operand is 1, then the result is 1. Otherwise, the result is zero 2 ^ 7 5
• 5. >> Shift right The right shift operator, >>, shifts all of the bits in a value to the right a specified number of times. 7 >> 2 1 >>> Shift right zero fill shift a zero into the high- order bit no matter what its initial value was -1 >>> 30 3 << Shift left The left shift operator, <<, shifts all of the bits in a value to the left a specified number of times. 2 << 2 8 &= Bitwise AND assignment This is a short sign of AND operation on same variable a=2 a& = 2 a = 2
• 6. 4/10/2013 Md.Samsuzzaman,Lecturer,Dept of CCE,PSTU 6 The Left Shift byte a=8, b=24; int c; c=a<<2; 00001000 << 2 = 00100000=32 Java’s automatic type conversion produces unexpected result when shifting byte and short values. Example: byte a = 64, b; int i; i = a<<2; b= (byte) (a<<2); i 00000000 00000000 00000001 00000000 = 256 b 00000000 = 0 Each left shift double the value which is equivalent to multiplying by 2.
• 7. 4/10/2013 Md.Samsuzzaman,Lecturer,Dept of CCE,PSTU 7 The Right Shift byte a=8, b=24; int c ; c=a>>2; 00001000 >> 2= 00000010=2 Use sign extension. Each time we shift a value to the right, it divides that value by two and discards any remainder. The Unsigned Right Shift byte a=8, b=24; int c; c=a>>>1 00001000 >>> 1= 00000100=4
• 8. public class BitewiseDemo { public static void main(String[] args) { System.out.println("<-------Bitewise Logical Operators------->"); String binary[] = {"0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"}; int a = 2; // 0 + 0 + 2 + 0 or 0010 in binary int b = 7; // 0 + 4 + 2 + 1 or 0111 in binary int c = a | b; //Bitwise AND operator int d = a & b; //Bitwise OR operator int e = a ^ b; //Bitwise XOR(exclusive OR) operator int f = ~a & a ; //Bitwise unary NOT operator, a = 0010 so ~a = 1101 hence f = ~a & a = 1101 & 0010 = 0000 int g = (~a & b) | (a & ~b); System.out.println("The binary value of a = " + binary[a]); System.out.println("The binary value of b = " + binary[b]); System.out.println("The Bitwise OR : a | b = " +c); System.out.println("The Bitwise AND : a & b = " +d); System.out.println("The Bitwise XOR(exclusive OR) : a ^ b = “ +e); System.out.println("The Bitwise unary NOT : ~a & a = “ +f); System.out.println("~a&b|a&~b = " +g); System.out.println();
• 9. System.out.println("<-------Bitewise Shift Operators------->"); System.out.println("The original binary value of a = " +binary[a] + " and Decimal value of a = "+a); a = a << 2; //Bitwise Left shift operator System.out.println("The Left shift : a = "+a); b = b >> 2; //Bitwise Right shift operator System.out.println("The Right shift : b = b >> 2 = “ +b); int u = -1; System.out.println("The original decimal value of u = " +u); u = u >>> 30; //Bitwise Unsigned Right shift operator System.out.println("The Unsigned Right shift : u = u >>> 30 means u = 11111111 11111111 11111111 11111111 >>> 30 hence u = "+binary[u] + " and Decimal value of u = "+u); System.out.println();
• 10. System.out.println("<-------Bitewise Assignment Operators------->"); int p = 5; System.out.println("The original binary value of p = " +binary[p] + " and Decimal value of p = "+p); p >>= 2; //Bitewise shift Right Assignment Operator System.out.println("The Bitewise Shift Right Assignment Operators : p >>= 2 means p = p >> 2 hence p = 0101 >> 2 so p = "+binary[p] + " and Decimal value of p = "+p); /*Same as you can check Bitwise AND assignment,Bitwise OR assignment,Bitwise exclusive OR assignment, Shift right zero fill assignment,Shift left assignment */ } }
• 11. <-------Bitewise Logical Operators-------> The binary value of a = 0010 The binary value of b = 0111 The Bitwise OR : a | b = 7 The Bitwise AND : a & b = 2 The Bitwise XOR(exclusive OR) : a ^ b = 5 The Bitwise unary NOT : ~a & a = 0 ~a&b|a&~b = 5 <-------Bitewise Shift Operators-------> The original binary value of a = 0010 and Decimal value of a = 2 The Left shift : a = 8 The Right shift : b = b >> 2 = 1 The original decimal value of u = -1 The Unsigned Right shift : u = u >>> 30 means u = 11111111 11111111 11111111 11111111 >>> 30 hence u = 0011 and Decimal value of u = 3 <-------Bitewise Assignment Operators-------> The original binary value of p = 0101 and Decimal value of p = 5 The Bitewise Shift Right Assignment Operators : p >>= 2 means p = p >> 2 hence p = 0101 >> 2 so p = 0001 and Decimal value of p = 1
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