📅 Date: Jan 21, 2026
🔥 Topic: Relationship between Pointers & Arrays

🤯 The Big Reveal

Today I learned a shocking fact: The name of an array is actually a pointer to its first element.

If I have int arr[5], then just writing arr gives me the address of arr[0].

💻 Day 21 Code: Accessing Array via Pointer

I can access array elements without using square brackets []!

#include <iostream>
using namespace std;

int main() {
    int marks[] = {90, 80, 70};
    
    // Pointing to the first block
    int *p = marks;

    cout << "First element (*p): " << *p << endl;
    
    // Moving to next block logic (Internal)
    cout << "Second element *(p+1): " << *(p+1) << endl;
    
    // Formula: arr[i] == *(arr + i)
    cout << "Third element *(arr+2): " << *(marks+2) << endl;

    return 0;
}

💭 Thoughts

This explains why Arrays are 0-indexed. The index is just an "offset" from the starting address. *(arr + 0) is the start.