Pointers to pointers in C - Mini Project: Build & Apply

Pointers to pointers

📖 Scenario: Imagine you have a box that holds a number, and another box that holds the address of the first box. This is like pointers to pointers in C.

🎯 Goal: You will create a pointer to a pointer and print the value it points to.

📋 What You'll Learn

Create an integer variable with a specific value

Create a pointer to that integer

Create a pointer to the pointer

Print the value of the integer using the pointer to pointer

💡 Why This Matters

🌍 Real World

Pointers to pointers are used in real programs to handle dynamic data structures like linked lists, trees, and to manage memory efficiently.

💼 Career

Understanding pointers to pointers is important for systems programming, embedded systems, and performance-critical applications.

1

Create an integer variable

Create an integer variable called num and set it to 10.

C

# Your code here

Need a hint?

Use int num = 10; to create the variable.

2

Create a pointer to the integer

Create a pointer called ptr that points to the variable num.

C

int num = 10;
# Your code here

Need a hint?

Use int *ptr = # to create the pointer.

3

Create a pointer to the pointer

Create a pointer called pptr that points to the pointer ptr.

C

int num = 10;
int *ptr = #
# Your code here

Need a hint?

Use int **pptr = &ptr; to create the pointer to pointer.

4

Print the value using the pointer to pointer

Use printf to print the value of num by dereferencing the pointer to pointer pptr.

C

int num = 10;
int *ptr = #
int **pptr = &ptr;
// Your code here

Need a hint?

Use printf("%d\n", **pptr); to print the value.