Dharani Tech Edu Hub

Introduction to Pointers in C

---

Introduction

Pointers are one of the most powerful and important concepts in C programming.

👉 A pointer is a variable that stores the address of another variable.

---

What is a Pointer?

A pointer is:
👉 A variable that stores memory address

---

Why Use Pointers?

• ✔ Efficient memory usage
• ✔ Dynamic memory allocation
• ✔ Used in arrays, functions, structures
• ✔ Faster program execution

---

Declaration of Pointer

data_type *pointer_name;

---

Example

int *ptr;

---

Initialization of Pointer

int a = 10;
int *ptr = &a;

---

👉 & → Address of operator

---

Accessing Value Using Pointer

printf("%d", *ptr);

👉 * → Dereference operator (value at address)

---

Example Program

#include <stdio.h>

int main() {
    int a = 10;
    int *ptr;

    ptr = &a;

    printf("Value of a = %d\n", a);
    printf("Address of a = %p\n", &a);
    printf("Pointer value = %p\n", ptr);
    printf("Value using pointer = %d\n", *ptr);

    return 0;
}

---

Output

Value of a = 10
Address of a = (memory address)
Pointer value = (same address)
Value using pointer = 10

---

Key Operators

Operator	Meaning
&	Address of variable
*	Dereference (value at address)

---

Pointer and Variable Relationship

👉 Example:

int a = 5;
int *ptr = &a;

• a → value = 5
• &a → address of a
• ptr → stores address
• *ptr → value at address (5)

---

Important Points

• Pointer must be initialized
• Always use correct data type
• Uninitialized pointer → garbage value

---

Common Mistakes

• ❌ Using pointer without initialization
• ❌ Confusing * and &
• ❌ Wrong data type pointer
• ❌ Dereferencing NULL pointer

---

Pro Tips

• ✔ Practice pointer basics
• ✔ Understand memory clearly
• ✔ Use pointers carefully
• ✔ Learn pointer with arrays

---

Conclusion

Pointers are a core concept in C programming. They give direct access to memory and improve performance.

Mastering pointers will take your programming skills to the next level.

👉 This article is part of Dharani Tech Edu Hub — where learning programming is made simple and practical.