鍍金池/ 教程/ C/ Objective-C 運(yùn)算符
Objective-C 多態(tài)性
Objective-C 預(yù)處理器
Objective-C for循環(huán)
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(yùn)算
Objective-C 循環(huán)
Objective-C 錯(cuò)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(yùn)算符
Objective-C 數(shù)據(jù)類型
Objective-C 邏輯運(yùn)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
Objective-C 日志處理
Objective-C 數(shù)據(jù)存儲(chǔ)
Objective-C 教程首頁
Objective-C 擴(kuò)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(shí)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(dòng)態(tài)綁定
Objective-C 復(fù)合對(duì)象
Objective-C Arrays/數(shù)組
Objective-C 位運(yùn)算符
Objective-C 指向指針的指針
Objective-C 從函數(shù)返回?cái)?shù)組
Objective-C Posing/冒充
Objective-C Categories/類別
Objective-C 文件處理
Objective-C 賦值運(yùn)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(yùn)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(duì)象
Objective-C 變量
Objective-C 關(guān)系運(yùn)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 運(yùn)算符

運(yùn)算符是一個(gè)符號(hào),它告訴編譯器執(zhí)行特定的數(shù)學(xué)或邏輯操作。 Objective-C語言有豐富的內(nèi)置運(yùn)算符并提供了以下幾種類型:

  • 算術(shù)運(yùn)算符

  • 關(guān)系運(yùn)算符

  • 邏輯運(yùn)算符

  • 位運(yùn)算符

  • 賦值運(yùn)算符

  • 其他運(yùn)算符

本教程將逐個(gè)講解算術(shù)表達(dá)式,關(guān)系邏輯,按位分配和其他運(yùn)算符。

算術(shù)運(yùn)算符

下表列出了所有支持Objective-C語言的算術(shù)運(yùn)算符。假設(shè)變量A=10,變量B=20,則:

顯示實(shí)例

運(yùn)算符 描述 示例
+ Adds two operands A + B will give 30
- Subtracts second operand from the first A - B will give -10
* Multiplies both operands A * B will give 200
/ Divides numerator by denominator B / A will give 2
% Modulus Operator and remainder of after an integer division B % A will give 0
++ Increment operator increases integer value by one A++ will give 11
-- Decrement operator decreases integer value by one A-- will give 9

關(guān)系運(yùn)算符

下表列出了所有支持Objective-C語言的關(guān)系運(yùn)算符。假設(shè)變量A=10和變量B=20,則:

顯示實(shí)例

運(yùn)算符 描述 示例
== Checks if the values of two operands are equal or not; if yes, then condition becomes true. (A == B) is not true.
!= Checks if the values of two operands are equal or not; if values are not equal, then condition becomes true. (A != B) is true.
> Checks if the value of left operand is greater than the value of right operand; if yes, then condition becomes true. (A > B) is not true.
< Checks if the value of left operand is less than the value of right operand; if yes, then condition becomes true. (A < B) is true.
>= Checks if the value of left operand is greater than or equal to the value of right operand; if yes, then condition becomes true. (A >= B) is not true.
<= Checks if the value of left operand is less than or equal to the value of right operand; if yes, then condition becomes true. (A <= B) is true.

邏輯運(yùn)算符

下表列出了所有支持Objective-C語言的邏輯運(yùn)算符。假設(shè)變量A=1,變量B=0,那么:

顯示實(shí)例

運(yùn)算符 描述 示例
&& Called Logical AND operator. If both the operands are non zero then condition becomes true. (A && B) is false.
|| Called Logical OR Operator. If any of the two operands is non zero then condition becomes true. (A || B) is true.
! Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true, then Logical NOT operator will make false. !(A && B) is true.

位運(yùn)算符

位運(yùn)算符位和位操作執(zhí)行位。 &, |, 和 ^ 真值表如下:

p q p & q p | q p ^ q
0 0 0 0 0
0 1 0 1 1
1 1 1 1 0
1 0 0 1 1

假設(shè),如果A=60和B=13; 現(xiàn)在以二進(jìn)制格式將如下:

A = 0011 1100

B = 0000 1101

-----------------

A&B = 0000 1100

A|B = 0011 1101

A^B = 0011 0001

~A  = 1100 0011

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

顯示實(shí)例

運(yùn)算符 描述 例子
& 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.
<< Binary Left Shift Operator. The left operands 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 operands value is moved right by the number of bits specified by the right operand. A >> 2 will give 15, which is 0000 1111

賦值運(yùn)算符

支持Objective-C語言的賦值運(yùn)算符有以下:

顯示例子

運(yùn)算符 描述 示例
= Simple assignment operator, Assigns values from right side operands to left side operand C = A + B will assign value of A + B into C
+= Add AND assignment operator, It adds right operand to the left operand and assigns the result to left operand C += A is equivalent to C = C + A
-= Subtract AND assignment operator, It subtracts right operand from the left operand and assigns the result to left operand C -= A is equivalent to C = C - A
*= Multiply AND assignment operator, It multiplies right operand with the left operand and assigns the result to left operand C *= A is equivalent to C = C * A
/= Divide AND assignment operator, It divides left operand with the right operand and assigns the result to left operand C /= A is equivalent to C = C / A
%= Modulus AND assignment operator, It takes modulus using two operands and assigns the result to left operand C %= A is equivalent to C = C % A
<<= Left shift AND assignment operator C <<= 2 is same as C = C << 2
>>= Right shift AND assignment operator C >>= 2 is same as C = C >> 2
&= Bitwise AND assignment operator C &= 2 is same as C = C & 2
^= bitwise exclusive OR and assignment operator C ^= 2 is same as C = C ^ 2
|= bitwise inclusive OR and assignment operator C |= 2 is same as C = C | 2

其他運(yùn)算符 ? sizeof & 三元

一些其他重要的運(yùn)算符,包括sizeof 和 ? :支持Objective-C語言。

顯示示例

    運(yùn)算符 描述 例子
    sizeof() Returns the size of an variable. sizeof(a), where a is integer, will return 4.
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