C Pointer Examples

/* Pointer examples */

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
    // Shows memory addresses of strings (first 100 arguments)
    printf("Showing memory addresses of the arguments\n\n");

    if (argc < 2) {
        fprintf(
            stderr,
            "Error: cannot show memory addresses of strings. Syntax: %s word1 [...]\n",
            argv[0]
        );
    } else {
        for (int i = 1; i < argc && i < 101; i++) {
            char* word = argv[i];

            printf(
                "\"%s\" @ %p\n",
                word,
                word
            );
        }
    }

    // Shows dereferencing
    printf("\nDe-referencing Example\n\n");

    int x = 64;
    int *p = &x;

    printf(
        "Raw integer: %d\nAddress: %p\nDereference: %d",
        x, p, *p
    );

    return EXIT_SUCCESS;
}