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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef struct matrix{
  5. 	double **data;
  6. 	int lines;
  7. 	int columns;
  8. }matrix;
  9.  
  10. // Returns an empty matrix ready for use. Should be called in every matrix initialization;
  11. matrix emptyMatrix()
  12. {
  13. 	matrix var;
  14.  
  15. 	var.data = NULL;
  16. 	var.lines = 0;
  17. 	var.columns = 0;
  18.  
  19. 	return var;	
  20. }
  21.  
  22. // Starts a matriz by dynamic allocation
  23. matrix startMatrix(int lin, int col)
  24. {
  25. 	matrix var;
  26.  
  27. 	// Make the atribuition of the matrix lines and columns size
  28. 	var.lines = lin;
  29. 	var.columns = col;
  30.  
  31. 	// Starts the matrix lines
  32. 	var.data = (double **) malloc( lin * sizeof(double *) );
  33.  
  34. 	for(int i = 0 ; i < lin ; i++)
  35. 	{
  36. 		*(var.data + i) = (double *) malloc( col * sizeof(double) );
  37. 	}
  38.  
  39. 	return var;
  40.  
  41. }
  42.  
  43. // Frees the dynamically allocated memory
  44. void endMatrix(matrix mat)
  45. {
  46. 	for(int i = 0 ; i < mat.lines ; i++)
  47. 	{
  48. 		free( *(mat.data + i) );
  49. 	}
  50.  
  51. 	free( mat.data );
  52.  
  53. 	mat.lines = 0;
  54. 	mat.columns = 0;
  55.  
  56. 	return;
  57. }
  58.  
  59. int main()
  60. {
  61. 	matrix var = emptyMatrix();
  62.  
  63. 	var = startMatrix(3, 3);	
  64.  
  65. 	for(int i = 0 ; i < var.lines ; i++)
  66. 		for(int j = 0 ; j < var.columns ; j++)
  67. 			var.data[i][j] = i+j;
  68.  
  69.  
  70. 	for(int i = 0 ; i < var.lines ; i++)
  71. 	{
  72. 		for(int j = 0 ; j < var.columns ; j++)
  73. 			printf("%lf ", var.data[i][j]);
  74.  
  75. 		putchar('\n');
  76. 	}		
  77.  
  78. 	endMatrix(var);
  79.  
  80. 	return 0;
  81. }
Success #stdin #stdout 0s 5296KB
comments (?)
stdin 
Standard input is empty
stdout 
0.000000 1.000000 2.000000 
1.000000 2.000000 3.000000 
2.000000 3.000000 4.000000
https://ideone.com/7G7SWs
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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