### 第13节：Objective-C 位运算符

&Binary AND Operator copies a bit to the result if it exists in both operands.(A & B) will give 12, which is 0000 1100
|Binary OR Operator copies a bit if it exists in either operand.(A | B) will give 61, which is 0011 1101
^Binary XOR Operator copies the bit if it is set in one operand but not both.(A ^ B) will give 49, which is 0011 0001
~Binary Ones Complement Operator is unary and has the effect of 'flipping' bits.(~A ) will give -61, which is 1100 0011 in 2's complement form due to a signed binary number.
<<Binary Left Shift Operator. The left operand's value is moved left by the number of bits specified by the right operand.A << 2 will give 240, which is 1111 0000
>>Binary Right Shift Operator. The left operand's value is moved right by the number of bits specified by the right operand.A >> 2 will give 15, which is 0000 1111

## 例子

```#import <Foundation/Foundation.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 */
NSLog(@"Line 1 - Value of c is %d
", c );

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

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

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

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

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

```2013-09-07 22:11:51.652 demo Line 1 - Value of c is 12
2013-09-07 22:11:51.652 demo Line 2 - Value of c is 61
2013-09-07 22:11:51.652 demo Line 3 - Value of c is 49
2013-09-07 22:11:51.652 demo Line 4 - Value of c is -61
2013-09-07 22:11:51.652 demo Line 5 - Value of c is 240
2013-09-07 22:11:51.652 demo Line 6 - Value of c is 15```

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