Cのビット演算子

次の表に、Cでサポートされているビットごとの演算子を示します。変数「A」が60を保持し、変数「B」が13を保持すると仮定します-

Operator	Description	Example
&	Binary AND Operator copies a bit to the result if it exists in both operands.	(A & B) = 12, i.e., 0000 1100
		Binary OR Operator copies a bit if it exists in either operand.
(A	B) = 61, i.e., 0011 1101	^
Binary XOR Operator copies the bit if it is set in one operand but not both.	(A ^ B) = 49, i.e., 0011 0001	~
Binary One’s Complement Operator is unary and has the effect of 'flipping' bits.	(~A ) = ~(60), i.e,. 1100 0011	<<
Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand.	A << 2 = 240 i.e., 1111 0000	>>

例

Cで利用可能なすべてのビット演算子を理解するために、次の例を試してください-

#include <stdio.h>

main() {

   unsigned int a = 60;/*60 = 0011 1100*/
   unsigned int b = 13;/*13 = 0000 1101*/
   int c = 0;

   c = a & b;      /*12 = 0000 1100*/
   printf("Line 1 - Value of c is %d\n", c );

   c = a | b;      /*61 = 0011 1101*/
   printf("Line 2 - Value of c is %d\n", c );

   c = a ^ b;      /*49 = 0011 0001*/
   printf("Line 3 - Value of c is %d\n", c );

   c = ~a;         /*-61 = 1100 0011 */
   printf("Line 4 - Value of c is %d\n", c );

   c = a << 2;    /*240 = 1111 0000*/
   printf("Line 5 - Value of c is %d\n", c );

   c = a >> 2;    /*15 = 0000 1111*/
   printf("Line 6 - Value of c is %d\n", c );
}

上記のプログラムをコンパイルして実行すると、次の結果が生成されます-

Line 1 - Value of c is 12
Line 2 - Value of c is 61
Line 3 - Value of c is 49
Line 4 - Value of c is -61
Line 5 - Value of c is 240
Line 6 - Value of c is 15

Cprogramming-c-bitwise-operators

Cのビット演算子

例