Basic Pointer Syntax

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

int main(void)
{
        int a = 100;
        /*
 *      ---------------------
 *      | Memory address = &a|
 *      ---------------------
 *      |    a = 100         |
 *      ---------------------
 *      */
        int *ptr = &a;
/*
 *      ---------------------------
 *      | Memory address = ptr = &a |
        ---------------------------
        | *ptr = a = 100           |
        ---------------------------
*/
        // To print the VALUE at the MEMORY ADDRESS
        printf("*ptr = %d\n", *ptr);
        // To Print the MEMORY ADDRESS itself
        printf("ptr = %p\n", (void *) ptr);
        printf("&a = %p\n", &a);

        return 0;
}