pointer_basics.c

// Filename: pointer_basics.c
// Author: Sam Mansouri
// Date: 10/15/2025
// Description: Demonstrates pointer basics, custom memcpy, and struct usage in C.

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

// Name: my_memcpy
// Description: Copies 'size' bytes from 'src' to 'dest' using uint8_t pointers
void my_memcpy(void* dest, const void* src, size_t size) {
    // =================> TODO: Implement byte-by-byte memory copy using uint8_t*
    uint8_t* d = dest;
    const uint8_t* s = src;

    while (size--) *d++ = *s++;
    
}

// Function: run_pointer_basics
// Description: Demonstrates pointer basics and custom memcpy
void run_pointer_basics() {

    // Step 1
    // =================> TODO: Declare and initialize an int[5] array
    int int_array[5] = {10, 20, 30, 40, 50};
    // =================> TODO: Declare and initialize a char[5] array
    char char_array[5] = {'A', 'B', 'C', 'D', 'E'};
    // =================> TODO: Print value and address of each element using a for loop
    for(int i = 0; i < 5; i++) printf("int_array[%d] = %d, address = %p\n", i, int_array[i], (void*)&int_array[i]);
    for(int i = 0; i < 5; i++) printf("char_array[%d] = %c, address = %p\n", i, char_array[i], (void*)&char_array[i]);
    // Step 2
    // =================> TODO: Declare source string and destination buffer
    const char src[] = "Sam Mansouri";
    char dest[20];
    // =================> TODO: Use my_memcpy() to copy string
    my_memcpy(dest, src, strlen(src) + 1); // +1 to copy the null terminator
    // =================> TODO: Print copied string
    printf("Copied string: %s\n", dest);
}