Objective-C 數組的指針
在我們了解指針數組的概念,讓我們考慮下麵的例子,這使得使用3個整數的數組:
#import <Foundation/Foundation.h> const int MAX = 3; int main () { int var[] = {10, 100, 200}; int i; for (i = 0; i < MAX; i++) { NSLog(@"Value of var[%d] = %d ", i, var[i] ); } return 0; }
上麵的代碼編譯和執行時,它會產生以下結果:
2013-09-14 00:22:57.136 demo[18206] Value of var[0] = 10 2013-09-14 00:22:57.136 demo[18206] Value of var[1] = 100 2013-09-14 00:22:57.136 demo[18206] Value of var[2] = 200
可能有情況時,我們要保持一個數組,它可以存儲指針int或char或任何其他數據類型可用。以下是一個整數指針數組的聲明:
int *ptr[MAX];
此聲明指針數組的最大整數指針。因此,每一個元素的指針,現在持有一個int值的指針。下麵的示例使用三個整數,將被存儲在一個數組中的指針如下:
#import <Foundation/Foundation.h> const int MAX = 3; int main () { int var[] = {10, 100, 200}; int i, *ptr[MAX]; for ( i = 0; i < MAX; i++) { ptr[i] = &var[i]; /* assign the address of integer. */ } for ( i = 0; i < MAX; i++) { NSLog(@"Value of var[%d] = %d ", i, *ptr[i] ); } return 0; }
上麵的代碼編譯和執行時,它會產生以下結果:
2013-09-14 00:27:47.904 demo[3825] Value of var[0] = 10 2013-09-14 00:27:47.905 demo[3825] Value of var[1] = 100 2013-09-14 00:27:47.905 demo[3825] Value of var[2] = 200
也可以使用一個指針數組,字符存儲的字符串列表如下:
#import <Foundation/Foundation.h> const int MAX = 4; int main () { char *names[] = { "Zara Ali", "Hina Ali", "Nuha Ali", "Sara Ali", }; int i = 0; for ( i = 0; i < MAX; i++) { NSLog(@"Value of names[%d] = %s ", i, names[i] ); } return 0; }
上麵的代碼編譯和執行時,它會產生以下結果:
2013-09-14 00:30:25.438 demo[13476] Value of names[0] = Zara Ali 2013-09-14 00:30:25.439 demo[13476] Value of names[1] = Hina Ali 2013-09-14 00:30:25.439 demo[13476] Value of names[2] = Nuha Ali 2013-09-14 00:30:25.439 demo[13476] Value of names[3] = Sara Ali