Objective-C 教學首頁
Objective-C 語言概述
Objective-C 開發環境(安裝配置)
Objective-C 基本語法
Objective-C 數據類型
Objective-C 變量
Objective-C 常量
Objective-C 運算符
Objective-C 算術運算符
Objective-C 關係運算符
Objective-C 邏輯運算符
Objective-C 位運算符
Objective-C 賦值運算符
Objective-C 循環
Objective-C while循環
Objective-C for循環
Objective-C do...while循環
Objective-C 嵌套循環
Objective-C break語句
Objective-C continue語句
Objective-C 決策
Objective-C if語句
Objective-C if...else 語句
Objective-C 嵌套 if 語句
Objective-C switch語句
Objective-C 嵌套switch語句
Objective-C 函數
Objective-C 函數按值調用
Objective-C 函數引用調用
Objective-C 塊
Objective-C Numbers/數字
Objective-C Arrays/數組
Objective-C 多維數組
Objective-C 數組作爲函數參數傳遞
Objective-C 從函數返回數組
Objective-C 指針的數組
Objective-C 指針
Objective-C 指針運算
Objective-C 數組的指針
Objective-C 指向指針的指針
Objective-C 傳遞函數的指針
Objective-C 函數返回指針
Objective-C NSString/字符串
Objective-C struct/結構
Objective-C 預處理器
Objective-C typedef
Objective-C 類型轉換
Objective-C 日誌處理
Objective-C 錯誤處理
Objective-C 類&對象
Objective-C 繼承
Objective-C 多態性
Objective-C 數據封裝
Objective-C Categories/類別
Objective-C Posing/冒充
Objective-C 擴展
Objective-C Protocols/協議
Objective-C 動態綁定
Objective-C 複合對象
Obj-C Foundation/基礎框架
Objective-C 數據存儲
Objective C 文本和字符串
Objective-C 日期和時間
Objective-C 異常處理
Objective-C 文件處理
Objective-C URL加載系統
Objective-C 快速枚舉
Objective-C 內存管理

Objective-C 嵌套 if 語句

在Objective-C編程嵌套if-else語句,它始終是合法,這意味着你可以使用一個或else if語句if或else if語句放在另一個裏面。



if( boolean_expression 1) { /* Executes when the boolean expression 1 is true */ if(boolean_expression 2) { /* Executes when the boolean expression 2 is true */ } }

你可以嵌套else if...else其他類似的方法在已經嵌套 if語句。 


#import <Foundation/Foundation.h> int main () { /* local variable definition */ int a = 100; int b = 200; /* check the boolean condition */ if( a == 100 ) { /* if condition is true then check the following */ if( b == 200 ) { /* if condition is true then print the following */ NSLog(@"Value of a is 100 and b is 200
" ); } } NSLog(@"Exact value of a is : %d
", a ); NSLog(@"Exact value of b is : %d
", b ); return 0; }


2013-09-07 22:08:19.984 demo[18141] Value of a is 100 and b is 200
2013-09-07 22:08:19.985 demo[18141] Exact value of a is : 100
2013-09-07 22:08:19.985 demo[18141] Exact value of b is : 200