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                # C++ 指針數組 在我們講解指針數組的概念之前,先讓我們來看一個實例,它用到了一個由 3 個整數組成的數組: ~~~ #include <iostream> using namespace std; const int MAX = 3; int main () { int var[MAX] = {10, 100, 200}; for (int i = 0; i < MAX; i++) { cout << "Value of var[" << i << "] = "; cout << var[i] << endl; } return 0; } ~~~ 當上面的代碼被編譯和執行時,它會產生下列結果: ~~~ Value of var[0] = 10 Value of var[1] = 100 Value of var[2] = 200 ~~~ 可能有一種情況,我們想要讓數組存儲指向 int 或 char 或其他數據類型的指針。下面是一個指向整數的指針數組的聲明: ~~~ int *ptr[MAX]; ~~~ 在這里,把 **ptr** 聲明為一個數組,由 MAX 個整數指針組成。因此,ptr 中的每個元素,都是一個指向 int 值的指針。下面的實例用到了三個整數,它們將存儲在一個指針數組中,如下所示: ~~~ #include <iostream> using namespace std; const int MAX = 3; int main () { int var[MAX] = {10, 100, 200}; int *ptr[MAX]; for (int i = 0; i < MAX; i++) { ptr[i] = &var[i]; // 賦值為整數的地址 } for (int i = 0; i < MAX; i++) { cout << "Value of var[" << i << "] = "; cout << *ptr[i] << endl; } return 0; } ~~~ 當上面的代碼被編譯和執行時,它會產生下列結果: ~~~ Value of var[0] = 10 Value of var[1] = 100 Value of var[2] = 200 ~~~ 您也可以用一個指向字符的指針數組來存儲一個字符串列表,如下: ~~~ #include <iostream> using namespace std; const int MAX = 4; int main () { char *names[MAX] = { "Zara Ali", "Hina Ali", "Nuha Ali", "Sara Ali", }; for (int i = 0; i < MAX; i++) { cout << "Value of names[" << i << "] = "; cout << names[i] << endl; } return 0; } ~~~ 當上面的代碼被編譯和執行時,它會產生下列結果: ~~~ Value of names[0] = Zara Ali Value of names[1] = Hina Ali Value of names[2] = Nuha Ali Value of names[3] = Sara Ali ~~~
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