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- #include <stdio.h>
- #include <stdlib.h>
- int main()
- {
- int num_of_rows = 3;
- int num_of_cols = 4;
- // Allocate memory for an array of int pointers
- int **p_mtrx = malloc( num_of_rows * sizeof(int *) );
- if ( p_mtrx == NULL )
- {
- // If allocation fails, print an error and exit
- printf("Error: failed to allocate memory for p_mtrx.\n");
- return 1;
- }
- // Allocate memory for each row and initialize values
- for ( int i = 0; i < num_of_rows; ++i )
- {
- p_mtrx[i] = malloc( num_of_cols * sizeof(int) );
- if ( p_mtrx[i] == NULL )
- {
- // If allocation fails for a row,
- // clean up previously allocated rows
- printf("Error: failed to allocate memory for p_mtrx row [%d].\n", i);
- for ( int j = 0; j < i; ++j )
- {
- // Free each previously allocated row
- free( p_mtrx[j] );
- }
- // Free the top-level pointer array
- free( p_mtrx );
- return 1;
- }
- // Fill the row with sample values
- // sequential integers
- for ( int j = 0; j < num_of_cols; ++j )
- {
- p_mtrx[i][j] = i * num_of_cols + j;
- }
- }
- // Print the contents of the 2D array
- printf("Contents:\n");
- for ( int i = 0; i < num_of_rows; ++i )
- {
- for ( int j = 0; j < num_of_cols; ++j )
- {
- printf("%d ", p_mtrx[i][j] );
- }
- printf("\n");
- }
- // Free all allocated memory
- // Free each row
- for ( int i = 0; i < num_of_rows; ++i )
- {
- free( p_mtrx[i] );
- }
- // Free the array of row pointers
- free( p_mtrx );
- // Exit normal
- return 0;
- }
- /*
- Output:
- Contents:
- 0 1 2 3
- 4 5 6 7
- 8 9 10 11
- */
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