Pointer declaration in C++ - Mini Project: Build & Apply

Pointer Declaration in C++

📖 Scenario: Imagine you are working with a simple program that needs to store and access the memory address of an integer variable. This is common in many real-world applications where you want to work directly with memory locations.

🎯 Goal: You will create a pointer to an integer variable, assign the address of the variable to the pointer, and then print the value using the pointer.

📋 What You'll Learn

Create an integer variable named num with the value 42.

Declare a pointer to an integer named ptr.

Assign the address of num to ptr.

Print the value of num using the pointer ptr.

💡 Why This Matters

🌍 Real World

Pointers are used in many programs to efficiently manage memory and work with data structures like linked lists, trees, and arrays.

💼 Career

Understanding pointers is essential for systems programming, embedded development, and performance-critical applications.

1

Create an integer variable

Create an integer variable called num and set it to 42.

C++

// Create an integer variable called num and set it to 42
// Your code here

Need a hint?

Use int to declare an integer variable and assign the value 42.

2

Declare a pointer to the integer

Declare a pointer to an integer called ptr.

C++

int num = 42;
// Declare a pointer to an integer called ptr
// Your code here

Need a hint?

Use int* to declare a pointer to an integer.

3

Assign the address of the variable to the pointer

Assign the address of num to the pointer ptr using the address-of operator &.

C++

int num = 42;
int* ptr;
// Assign the address of num to ptr
// Your code here

Need a hint?

Use ptr = # to assign the address of num to ptr.

4

Print the value using the pointer

Print the value of num by dereferencing the pointer ptr using *ptr and std::cout.

C++

#include 

int main() {
    int num = 42;
    int* ptr;
    ptr = #
    // Print the value of num using *ptr
    // Your code here
    return 0;
}

Need a hint?

Use std::cout << *ptr << std::endl; to print the value pointed to by ptr.