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C ++ pointer array

C ++ pointers C ++ pointers

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

C ++ pointers C ++ pointers