intro_pointers.c

// Filename: intro_pointers.c
// Author: Sam Mansouri
// Date: 10/15/2025
// Description: Demonstrates basic pointer usage in C.

// ===== Includes =====
#include <stdio.h>
#include <string.h>
#include "hwlib.h"

// Function: run_intro_pointers
// Description: Demonstrates basic pointer usage
void run_intro_pointers() {
    // Step 1
    // =================> TODO: Declare an int a and set it to 42
    int a = 42;
    // =================> TODO: Create a pointer p to a
    int* p = &a;
    // =================> TODO: Use p to reassign a to the value of 100
    *p = 100;
    // =================> TODO: Print a and *p, and the address of a
    printf("This is the value of a: %d\nThis is the value of *p: %d\nThis is the address of a: %p\n", a, *p, (void*)&a);
    // Step 2
    // =================> TODO: Create another pointer q and set it equal to p
    int* q = p;
    // =================> TODO: Use q to change value of a
    *q = 314;
    // =================> TODO: Print a, *p, and *q
    printf("This is the value of a: %d\nThis is the value of *p: %d\nThis is the value of *q: %d\n", a, *p, *q);
    // Step 3
    // =================> TODO: Declare b = 200
    int b = 200;
    printf("Original b = %d\n", b);

    // =================> TODO: Reassign p to point at b
    p = &b;
    // =================> TODO: Use p to reassign b to be the value 200
    *p = 200;
    // =================> TODO: Print a and b
    printf("This is the value of a: %d\nThis is the value of b: %d\n", a, b);
}