C ++ pointer array
Before we explain the concept of an array of pointers, let us look at an example that uses an array of three integers:
#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; }
When the above code is compiled and executed, it produces the following results:
Value of var[0] = 10 Value of var[1] = 100 Value of var[2] = 200
There may be a case, we want to make an array of storage point to an int or char or any other data type pointer. The following is a statement pointer pointing to an array of integers:
int *ptr[MAX];
Here, theptr declared as an array of pointers to integers by the MAX.Thus, ptr each element is a pointer to int values. The following example uses three integers, they will be stored in an array of pointers, as follows:
#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]; // 赋值为整数的地址 } for (int i = 0; i < MAX; i++) { cout << "Value of var[" << i << "] = "; cout << *ptr[i] << endl; } return 0; }
When the above code is compiled and executed, it produces the following results:
Value of var[0] = 10 Value of var[1] = 100 Value of var[2] = 200
You can also use a pointer to an array of characters to store a list of strings, as follows:
#include <iostream> using namespace std; const int MAX = 4; int main () { const 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; }
When the above code is compiled and executed, it produces the following results:
Value of names[0] = Zara Ali Value of names[1] = Hina Ali Value of names[2] = Nuha Ali Value of names[3] = Sara Ali