Simple 2d array dynamic memory allocation and reallocation

2d_array_malloc_realloc.c

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

int main() {
    int row = 5;
    int col = 5;

    
    int **arr2d, y, x;
    
    arr2d = (int **) malloc(sizeof(int *) * row); // allocate memory for each row which is pointer to a pointer
    for (y = 0; y < row; y++) {
        arr2d[y] = malloc(sizeof(int) * col); // now allocate memory block for each row as one dimension array
    }

    // put some values into them
    for (y = 0; y < row; y++) {
        for (x = 0; x < col; x++) {
            arr2d[y][x] = row * y + x;
        }
    }

    // print all the values
    for (y = 0; y < row; y++) {
        for (x = 0; x < col; x++) {
            printf("%5d", arr2d[y][x]);
        }
        printf("\n");
    }


    int newRow = 6;
    int newCol = 6;

    arr2d = realloc(arr2d, sizeof(int *) * newRow);
    for (y = 0; y < newRow; y++) {
        arr2d[y] = realloc(arr2d[y], sizeof(int) * newCol);
        if (arr2d[y] == NULL) {
            // TODO: handle memory allocation fail error
            exit(1);
        }
    }


    // print all the values
    for (y = 0; y < newRow; y++) {
        for (x = 0; x < newCol; x++) {
            printf("%5d", arr2d[y][x]);
        }
        printf("\n");
    }

    return 0;
}