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

int main(int argc, char* argv[]) {
    int n = 5;
    int const* a_n_const = &n;

    int m = *a_n_const;
    m *= 2;  // OKAY

    int* a_n_not_const = a_n_const;  // ERROR:  assignment discards const qualifier
                                     // a_n_const     is declared as int const*
                                     // a_n_not_const is declared as int      *
                                     //                                    ↑
                                     //                                 const discarded
    *a_n_const *= 2;  // won't get here

    assert(n == 5);
    assert(m == 10);
    return EXIT_SUCCESS;
}
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