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

int main(int argc, char* argv[]) {

    int    n = 5;
    int* a_n = &n;
    printf("n == %d;   a_n == %p;\n\n", n, (void*) a_n);
    printf("*a_n == %d   (value at address a_n)\n", *a_n);

    *a_n = 77;

    printf("*a_n = 77;\n\n");
    
    printf("n == %d;   a_n == %p;\n\n", n, (void*) a_n);
    printf("*a_n == %d   (value at address a_n)\n", *a_n);

    // Note:  Do not use type casts unless you have a *very* good reason.
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */

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