dynamic allocate two dimensions array

#include        <stdio.h>
#include        <stdlib.h>

#define ROW     2
#define COLUMN  3

void err_sys(const char *p_error);

int
main(int argc, char **argv)
{
        int     i, j, k;
        int     **ptr;

        /* attention sizeof(*ptr) */
        if ((ptr = malloc(sizeof(*ptr) * ROW)) == NULL)
                err_sys("malloc error");
        
        for (i = 0; i < ROW; i++)
                if ((ptr[i] = malloc(sizeof(int) * COLUMN)) == NULL)
                        err_sys("malloc error");
       
        for (j = 0; j < ROW; j++)
                for (k = 0; k < COLUMN; k++)
                        scanf("%d", &ptr[j][k]);

        for (j = 0; j < ROW; j++) {
                for (k = 0; k < COLUMN; k++)
                        printf("%d ", ptr[j][k]);
                printf("\n");
        }

        exit(0);
}

void
err_sys(const char *p_error)
{
        perror(p_error);

        exit(1);
}
                       
               
                        

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