Array of pointers

What is a Pointer?

The pointers in C point towards the variables present in a program. They hold the addresses of the variables. The program will use these addresses to get the right to the variables and modify them. right here are the three crucial things that come into play when dealing with pointers in C:

• Declaration of the pointer variable
• Initialisation of the pointer variable
• Using the pointer to access the variable
  Check out this problem - Find Duplicate In Array

Steps To Create an Array of Pointers

We can follow given steps to create an array of pointers:

1. First, we want to create an array that includes a few elements. Let’s say ten elements for now.

Example

int myarray [2] = {10, 20};

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2. After this, we ought to create an array of pointers with the intention to store the address of the elements.

Example

int *myptr[1];

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3. To get the address of the element, we have got the ‘‘&’’ operator in c++. This can deliver us the address of the element in memory.

Example

myptr[1] = &myarray[1];

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4. Then, we can store this address of the elements into the array of pointers by using iterating them using for loop. This depends on the good judgment of ways we need them to be loaded in an array.

5. Now, we will access the array elements using the array of pointers. It will supply us with the same result.

Example of C++ Array of Pointers

Code

#include <bits/stdc++.h>
using namespace std;
int main() 
{
    cout << "Demo to show array of pointers! \n";
    int my_array[5] = {10, 20, 30, 40, 50}; 
    int *myptr[5];
    cout << "Value of array! \n";
    for (int i = 0; i < 5; i++) 
    {
        cout << my_array[i] << endl;
    }
    myptr[0] = &my_array[0];
    myptr[1] = &my_array[1];
    myptr[2] = &my_array[2];
    myptr[3] = &my_array[3];
    myptr[4] = &my_array[4];
    cout << "Value of array of pointers! \n";
    for (int i = 0; i < 5; i++) 
    {
        cout << *myptr[i] << endl;
    }
}

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Output

Demo to show array of pointers! 
Value of array! 
10
20
30
40
50
Value of array of pointers! 
10
20
30
40
50

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Frequently Asked Questions

1. What is the output of the C++ program with arrays and pointers?

int main()
{
    int size=4;
    int a[size];
    a[0]=5;a[1]=6;
    a[2]=7;a[3]=8;
    cout << *(a+2) << “” << a[1];
}

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Variable size is already defined. So a[size] is allowed. *(a+2) == a[2].So, output will be 7 6.
 

2. What’s the value of an array element that isn’t initialized?

It depends on Storage Class
 

3. What will be returned if you try to access an Array variable outside its size?

Some garbage value will be returned.
 

 4. Can we change the starting index of an array from 0 to 1 in any way?

 No, You can’t change the C++ Basic rules of the Zero Starting Index of an Array.

Key Takeaways

We learned about the array of pointers by using an array of pointers. We can control our array without problems because they may be very bound in nature. We need to access the elements by using the address of the elements. This address is not anything; the element’s element’s location from the memory to immediately access them. Now, After brushing up on your concepts about this topic, the next thing you should do is to head over to our practice platform Coding Ninjas Studio to practice top problems on every topic. You can also read the interview experiences of top product-based companies.