鍍金池/ 教程/ C/ Objective-C 位運算符
Objective-C 多態(tài)性
Objective-C 預處理器
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Objective-C 開發(fā)環(huán)境（安裝配置）
Obj-C Foundation/基礎(chǔ)框架
Objective-C 指針運算
Objective-C 循環(huán)
Objective-C 錯誤處理
Objective-C while循環(huán)
Objective-C if語句
Objective-C do...while循環(huán)
Objective-C教程
Objective-C 嵌套switch語句
Objective-C 函數(shù)按值調(diào)用
Objective-C 常量
Objective-C 運算符
Objective-C 數(shù)據(jù)類型
Objective-C 邏輯運算符
Objective-C 數(shù)組作為函數(shù)參數(shù)傳遞
Objective-C struct/結(jié)構(gòu)
Objective-C 嵌套循環(huán)
Objective-C 函數(shù)引用調(diào)用
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Objective-C 教程首頁
Objective-C 擴展
Objective-C 異常處理
Objective-C 類型轉(zhuǎn)換
Objective-C 嵌套 if 語句
Objective-C typedef
Objective-C 決策
Objective-C 指針的數(shù)組
Objective-C Protocols/協(xié)議
Objective-C 日期和時間
Objective-C 指針
Objective-C 內(nèi)存管理
命令行參數(shù)
Objective-C NSString/字符串
Objective-C 動態(tài)綁定
Objective-C 復合對象
Objective-C Arrays/數(shù)組
Objective-C 位運算符
Objective-C 指向指針的指針
Objective-C 從函數(shù)返回數(shù)組
Objective-C Posing/冒充
Objective-C Categories/類別
Objective-C 文件處理
Objective-C 賦值運算符
Objective-C 函數(shù)返回指針
Objective-C if...else 語句
Objective-C switch語句
Objective-C URL加載系統(tǒng)
Objective-C 算術(shù)運算符
Objective-C Numbers/數(shù)字
Objective-C語言程序結(jié)構(gòu)
Objective-C 快速枚舉
Objective-C 基本語法
Objective-C 類&對象
Objective-C 變量
Objective-C 關(guān)系運算符
Objective-C 塊
Objective-C break語句
Objective-C continue語句
Objective-C 語言概述
Objective C 文本和字符串
Objective-C 函數(shù)
Objective-C 傳遞函數(shù)的指針
Objective-C 數(shù)組的指針
Objective-C 多維數(shù)組
Objective-C 繼承
Objective-C 數(shù)據(jù)封裝

Objective-C 位運算符

下表中列出了支持Objective-C語言的位運算符。假設(shè)變量A=60和變量B=13，則：

運算符 描述說明 示例
& 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

嘗試下面的例子就明白了所有在Objective-C編程語言的位運算符：

#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 );
}

當編譯和執(zhí)行上述程序，它會產(chǎn)生以下結(jié)果：

2013-09-07 22:11:51.652 demo[30836] Line 1 - Value of c is 12
2013-09-07 22:11:51.652 demo[30836] Line 2 - Value of c is 61
2013-09-07 22:11:51.652 demo[30836] Line 3 - Value of c is 49
2013-09-07 22:11:51.652 demo[30836] Line 4 - Value of c is -61
2013-09-07 22:11:51.652 demo[30836] Line 5 - Value of c is 240
2013-09-07 22:11:51.652 demo[30836] Line 6 - Value of c is 15