#include #include #include #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: //