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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. void init_matrix ( double* m, unsigned n )
  5. {
  6.     unsigned i, j;
  7. 	for ( i = 0; i < n; i++ )
  8. 	{
  9. 		for ( j = 0; j < n; j++ )
  10. 		{
  11. 			m [ i * n + j ] = n;
  12. 		}
  13. 	}
  14. }
  15.  
  16. void display_matrix ( double* m, unsigned n )
  17. {
  18. 	unsigned i, j;
  19. 	for ( i = 0; i < n; i++ )
  20. 	{
  21. 		for ( j = 0; j < n; j++ )
  22. 		{
  23. 			printf ("%3.0lf", m [ i * n + j ] );
  24. 		}
  25. 		putchar('\n');
  26. 	}
  27. 	putchar('\n');
  28. }
  29.  
  30. void free_matrix ( double* m )
  31. {
  32. 	free ( m );
  33. }
  34.  
  35. int main(void)
  36. {
  37. 	double* M = NULL;
  38. 	const int nmax = 10;
  39. 	int x, y, n;
  40.  
  41. 	for ( n = 1; n <= nmax; n++ )
  42. 	{
  43. 		double* temp = realloc ( M, n * n * sizeof(double));
  44. 		if ( temp == NULL )
  45. 		{
  46. 			// realloc liefert NULL -> Fehlerbehandlung
  47. 			// Zugriff auf M möglich, um z.B. die Daten zu retten, etc.
  48. 		}
  49. 		else
  50. 		{
  51. 			M = temp; // Oki doki
  52. 		}
  53.  
  54. 		init_matrix ( M, n );
  55. 		display_matrix ( M, n );
  56. 	}
  57.  
  58. 	free ( M );
  59. 	return 0;
  60. }
Success #stdin #stdout 0s 1964KB
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https://ideone.com/dwLXio
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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