Pointer declaration - Mini Project: Build & Apply

Pointer declaration

📖 Scenario: You are learning how to use pointers in C. Pointers are variables that store memory addresses. This helps you work directly with memory locations.

🎯 Goal: Build a simple C program that declares an integer variable and a pointer to that integer. Then print the value of the integer using the pointer.

📋 What You'll Learn

Declare an integer variable with a specific value

Declare a pointer variable that points to the integer variable

Use the pointer to access and print the integer value

💡 Why This Matters

🌍 Real World

Pointers are used in C programming to work directly with memory. This is important for system programming, embedded devices, and performance-critical applications.

💼 Career

Understanding pointers is essential for jobs in systems programming, embedded software development, and any role that requires low-level memory management.

1

Declare an integer variable

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

C

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

Need a hint?

Use int num = 42; to declare the integer variable.

2

Declare a pointer to the integer

Declare a pointer variable called ptr that points to the integer variable num.

C

#include 

int main() {
    int num = 42;
    // Declare a pointer variable called ptr that points to num
    // Your code here
    return 0;
}

Need a hint?

Use int *ptr = # to declare a pointer to num.

3

Access the integer value using the pointer

Use the pointer ptr to access the value of num and store it in an integer variable called value.

C

#include 

int main() {
    int num = 42;
    int *ptr = #
    // Use ptr to get the value of num and store it in value
    // Your code here
    return 0;
}

Need a hint?

Use int value = *ptr; to get the value pointed by ptr.

4

Print the value using the pointer

Print the value of num by using the pointer ptr with printf. Use printf("%d\n", *ptr);.

C

#include 

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

Need a hint?

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