1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
int main(int argc, char* argv[]) {
int n1 = 5;
int* a_n1 = &n1;
// a_n1 is declared as a variable holding the "address of an int" (int*)
// ... and initialized to the "address of n1".
printf(" n1 == %d\n", n1);
printf("*a_n1 == %d\n", *a_n1); // print the value at address a_n1
printf("\n");
printf(" a_n1 == %p\n", (void*)a_n1); // print a_n1
printf(" &n1 == %p\n", (void*)(&n1)); // print address of &n1
printf("\n");
*a_n1 = 7; // Write 7 at address a_n1.
printf("*a_n1 = 7\n"); // print the value at a_n1
printf("--\n");
printf(" n1 == %d\n", n1);
printf(" a_n1 == %p\n", (void*)a_n1); // print a_n1
printf("\n");
int** a_a_n1 = &a_n1;
// a_a_n1 is declared as a variable holding the address to an address to an int.
// ... and is initialized to the address of a_n1.
printf(" &a_n1 == %p\n", (void*)(&a_n1)); // print address of a_n1
printf("a_a_n1 == %p\n", (void*)(a_a_n1)); // print a_a_n1
printf("\n");
int*** a_a_a_n1 = &a_a_n1;
// a_a_a_n1 is declared as a variable holding the address to an address to
// and address to an int.
// ... and is initialized to the address of a_a_n1.
printf(" &a_a_n1 == %p\n", (void*)(&a_a_n1)); // print address of a_a_n1
printf("a_a_a_n1 == %p\n", (void*)(a_a_a_n1)); // print a_a_a_n1
printf("\n");
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
|
© Copyright 2022 Alexander J. Quinn This content is protected and may not be shared, uploaded, or distributed.