C Programming – Day 8 | Pointers in C Explained for Beginners

POINTERS IN C

DAY - 8

Learn C Programming Day 8 with a detailed guide to pointers in C. Understand memory addresses, pointer declaration, dereferencing, and pointer arithmetic with clear beginner-friendly examples.

✅ We are at Day-8 — Pointers in C 🚀

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📍 Day-8 — Pointers in C

Today you will learn:

✅ What is a pointer?
✅ Pointer declaration & initialization
✅ Pointer to variable
✅ Pointer arithmetic
✅ Pointer with functions
✅ Task + Quiz

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✅ 1️⃣ What is a Pointer?

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

Example:

int a = 10;
int *p = &a; // p stores address of a

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✅ 2️⃣ Accessing Value via Pointer

int a = 10;
int *p = &a;

printf("Address of a: %p\n", p);
printf("Value of a: %d\n", *p); // dereference operator *

Output:

Address of a: 0x7ffe...
Value of a: 10

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✅ 3️⃣ Pointer Arithmetic

int arr[5] = {10,20,30,40,50};
int *p = arr;

printf("%d\n", *p);       // 10
printf("%d\n", *(p+1));   // 20

✅ p+1 → next element in memory

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✅ 4️⃣ Pointer with Functions

Pass by address to modify original value:

#include <stdio.h>

void increment(int *x){
    (*x)++;
}

int main(){
    int a = 5;
    increment(&a);
    printf("%d", a); // Output: 6
}

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✅ 5️⃣ Pointers & Arrays

int arr[3] = {1,2,3};
int *p = arr;

for(int i=0; i<3; i++){
    printf("%d ", *(p+i));
}

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✅ Task-8

Write a program:

✔ Input two numbers
✔ Use pointers to swap their values
✔ Print before and after swapping

Example Output:

Before Swap: a=5, b=10
After Swap: a=10, b=5

📌 Hint:

• Function can be used with pointer parameters

• Use * and &

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📝 Quick Quiz — Day-8

Reply like: 1A, 2C, 3B

1️⃣ Pointer stores:
A) Address
B) Value
C) Data type

2️⃣ Which operator is used to get value from pointer?
A) &
B) %
C) *

3️⃣ Pass pointer to a function → changes original value?
A) Yes
B) No
C) Only for integers

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📌 Reminder:

Send your Task-8 Code and Day-8 Quiz Answers when ready!

Then we can proceed to Day-9: Structures in C 💪

✅ NEXT - DAY - 9

C Programming Day 8 teaches pointers in C, including pointer declaration, initialization, dereferencing, and pointer arithmetic. Learn how to access and manipulate memory efficiently in C programming.