? Memory Address in C

In C, every variable is stored in memory, and that memory location has a unique address. You can access this address using the address-of operator &.

? What is a Memory Address?

It’s the location in memory (RAM) where a variable is stored. Think of it as a "house number" for your variable.

? Example: Getting Memory Address

c
#include <stdio.h>int main() {    int num = 42;    printf("Value: %d\n", num);    printf("Address: %p\n", &num);  // %p = format for memory address    return 0;}

Output:

makefile
Value: 42Address: 0x7ffee44d66a4  // (your address will differ)

? Key Concepts

? Example: Pointer and Address

c
int num = 100;int *ptr = #printf("num = %d\n", num);      // prints valueprintf("&num = %p\n", &num);    // prints addressprintf("ptr = %p\n", ptr);      // prints address stored in ptrprintf("*ptr = %d\n", *ptr);    // prints value at that address

? Why Care About Memory Addresses?

• Needed for pointers

• Essential in arrays, functions, and dynamic memory

• Useful for low-level programming (like embedded or system programming)