source: doc/theses/mike_brooks_MMath/programs/bkgd-carray-mdim.c @ 9d3a4cc

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

#define SHOW(x, fmt) printf( #x ": " fmt "\n", x )

#ifdef ERRS
#define ERR(...) __VA_ARGS__
#else
#define ERR(...)
#endif



int main() {
        float ar[3][10];
        static_assert(sizeof(float) == 4);                      $\C{// floats (atomic elements) are 4 bytes}$
        static_assert(sizeof(void*) == 8);                      $\C{// pointers are 8 bytes}$

        static_assert(sizeof(ar) == 120);                       $\C{// the array, float[3][10]}$
        static_assert(sizeof(ar[0]) == 40);                     $\C{// its first element, float[10]}$
        static_assert(sizeof(ar[0][0]) == 4);           $\C{// its first grand element, float}$

        static_assert(sizeof(&(ar)) == 8);                      $\C{// pointer to the array, float(*)[3][10]}$
        static_assert(sizeof(&(ar[0])) == 8);           $\C{// pointer to its first element, float(*)[10]}$
        static_assert(sizeof(&(ar[0][0])) == 8);        $\C{// pointer to its first grand-element, float*}$

        float (*pa)[3][10] = &(ar);
        float (*pa0)[10] = &(ar[0]);
        float *pa00 = &(ar[0][0]);

        static_assert((void*)&ar == (void*)&(ar[0] ));
        static_assert((void*)&ar == (void*)&(ar[0][0]));

        assert( (void *) pa == (void *) pa0 );
        assert( (void *) pa == (void *) pa00 );

//      float (*b[3])[10];
        float *b[3];
        for (int i = 0; i < 3; i ++) {
                b[i] = malloc(sizeof(float[10]));
        }
        ar[2][3];
        b[2][3];
/*

*/

}

// Local Variables: //
// compile-command: "sed -f sedcmd bkgd-carray-mdim.c | gcc-11 -Wall -Wextra -x c -" //
// End: //