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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. void matrix_allocation(int ***matrix, int N){
  5.     int i;
  6.     /* dynamic allocation for the matrix */
  7.     /*allocation of the rows*/
  8.     *matrix = (int**)malloc(N * sizeof(int*));  
  9.     if((*matrix) == NULL){
  10.     	printf("\n Error in memory allocation for the matrix \n");
  11.     }
  12.     /*allocation of the coloumns*/
  13.     for(i=0; i<N; i++){   
  14.     	(*matrix)[i]=(int*) malloc(N * sizeof(int));
  15.     	if ((*matrix)[i] == NULL){
  16.         	printf("Cannot allocate enough memory\n");
  17.         }
  18.     }
  19. }
  20.  
  21. void generate_matrix(int **matrix, int N){
  22.     int i, j;
  23.     for (i=0; i<N; i++){
  24.         for (j=0; j<N; j++){
  25.                     if(i==j){                   //the diagonal must be 0
  26.                         matrix[i][j] = 0;
  27.                         printf("%i\t", matrix[i][j]);
  28.                     } else {
  29.             			matrix[i][j] = rand()%10;
  30.                         printf("%i\t", matrix[i][j]);
  31.  
  32.                     }
  33.         }
  34.                 printf("\n");
  35.     }
  36.     printf("\nMatrix generated successfully!\n");
  37. }
  38.  
  39. void free_matrix(int **matrix, int N) {
  40. 	int i;
  41. 	for(i = 0; i < N; i++) free(matrix[i]);
  42. 	free(matrix);
  43. }
  44. int main(void) {
  45. 	int **matrix;
  46. 	matrix_allocation(&matrix, 5);
  47. 	generate_matrix(matrix, 5);
  48. 	free_matrix(matrix, 5);
  49. 	return 0;
  50. }
  51.  
Success #stdin #stdout 0s 2380KB
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stdin
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Standard input is empty
stdout
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0	3	6	7	5	
3	0	5	6	2	
9	1	0	2	7	
0	9	3	0	6	
0	6	2	6	0	

Matrix generated successfully!
https://ideone.com/0O3zZw
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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