AlliedModders - Dynamic allocation Of 2D arrays

Description: add to source, compile and run. very brief example usage (basically just the calling syntax) included in the comments two functions; the first dynamically allocates a 2D array with a user- or program-specified number of rows/columns; the second deallocates the same array. demonstrates the multi-dimensional usage of malloc and free. this snippet is also here: https://txeditor.com/jhn8gomb8g1

Code:

/*   allocate2D

/*   function to dynamically allocate 2-dimensional array using malloc.

/*

/*   accepts an int** as the "array" to be allocated, and the number of rows and

/*   columns.

*/

void allocate2D(int** array, int nrows, int ncols) {

     

     /*  allocate array of pointers  */

     array = ( int** )malloc( nrows*sizeof( int* ) );

     

     /*  allocate each row  */

     int i;

     for(i = 0; i < nrows; i++) {

          array[i] = ( int* )malloc( ncols*sizeof( int ) );

     }



}



/*   deallocate2D

/*   corresponding function to dynamically deallocate 2-dimensional array using 

/*   malloc.

/*

/*   accepts an int** as the "array" to be allocated, and the number of rows.  

/*   as with all dynamic memory allocation, failure to free malloc'ed memory

/*   will result in memory leaks

*/

void deallocate2D(int** array, int nrows) {

     

     /*  deallocate each row  */

     int i;

     for(i = 0; i < nrows; i++) {

          free(array[i]);

     }

     

     /*  deallocate array of pointers  */

     free(array);

     

}



/*   EXAMPLE USAGE:    

int** array1;



allocate2D(array1,1000,1000); //allocates a 1000x1000 array of ints



deallocate2D(array1,1000);    //deallocates the same array

*/