#include <stdio.h>
#include <stdlib.h>
 
int main(void){
    int *arr;
    unsigned int row = 3, col = 3,i, j, k;
    int l = 0;
 
 
    arr = calloc(sizeof( *arr ), sizeof *arr * row * col);
    if(arr == NULL){
        printf("Error, malloc\n");
        exit(3);
    }
 
    for ( i = 0; i < row ; i++){
        for ( j = 0 ; j < col ; j++){
            arr[i * col + j] = l;
            l++;
        }
    }
 
    for (k = 0 ; k < (row * col) ; k++){
        printf("%d ",arr[k]);
    }
 
    free(arr);
}

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