1 /* 2 * matrixpointer.c 3 * 4 * Beispiel-Programm Matrix als Feld von Feldern. 5 * Siehe zum Vergleich matrixpointerpointer.c 6 * 7 * Autor: H.Drachenfels 8 * Erstellt am: 29.10.2022 9 */

10

11 #include <stdio.h>

12 #include <stdlib.h>

13

14 #define M 3 // number of columns

15

16 int main(void)

17 {

18 //--------------------- allocate and initialize memory for 2x3-matrix

19 const int n = 2; // number of lines

20 int (*matrix)[M] = (int(*)[M]) malloc(n * sizeof (int[M]));

21 if (matrix == NULL)

22 {

23 printf("Speicherallokierungsfehler\n");

24 return 1;

25 }

26

27 matrix[0][0] = 10;

28 matrix[0][1] = 11;

29 matrix[0][2] = 12;

30 matrix[1][0] = 20;

31 matrix[1][1] = 21;

32 matrix[1][2] = 22;

33

34 //--------------------------------- print matrix addresses and values

35 printf("&matrix = %p\n", (void*) &matrix);

36 printf("matrix = %p\n", (void*) matrix);

37

38 for (int i = 0; i < n; ++i)

39 {

40 printf("[%d] %p: %p\n", i, (void*) &matrix[i], (void*) matrix[i]);

41

42 for (int j = 0; j < M; ++j)

43 {

44 printf(" [%d] %p: %d\n", j, (void*) &matrix[i][j], matrix[i][j]);

45 }

46 }

47

48 //------------------------------------------------- print matrix size

49 printf("sizeof matrix = %zu\n", sizeof matrix);

50 printf("%d * sizeof *matrix = %zu\n", n, n * sizeof *matrix);

51

52 free(matrix);

53 return 0;

54 }

55