source: doc/theses/mike_brooks_MMath/programs/bkgd-carray-mdim.c@ 485cf59

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

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

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

        static_assert((void*)&a == (void*)&(a[0]   ));
        static_assert((void*)&a == (void*)&(a[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]));
        }
        a[2][3];
        b[2][3];
/*

*/

}

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