11. Pointers — First Step

Address, & and *, modify via pointer — detailed + live

Goals:

Address-of &
Dereference *
Pointer se value change

1. Simple picture

int x = 10; → memory me kisi address pe 10 pada hai.
int *p = &x; → p us address ko hold karta hai.
*p → us address pe jaakar value padho/likho.

Analogy: x ghar hai, p us ghar ka address slip hai, *p ghar ke andar jana.

Live practice 1 — Pointer basics

Output padho: x, *p, phir change ke baad x.

#include <cstdio>

int main() {
    int x = 10;
    int *p = &x;

    printf("x = %d\n", x);
    printf("*p = %d\n", *p);

    *p = 25;
    printf("After *p = 25, x = %d\n", x);
    return 0;
}

Addresses har system/run pe alag ho sakte hain. Concept important hai, specific number yaad rakhna nahi.

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