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。
語法：
嵌套的if語句語法如下：
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。
例子：
#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; }
讓我們編譯和運行上面的程序，這將產生以下結果：
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