A simple C program to decompose a number in powers of 10

puzzledNumber.c

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


#define POWER(x, y) (long int)pow(x, (float)y)


uint8_t* puzzledNumber(int32_t number, uint16_t *size)
{
	int16_t i = 0, j = 0, k = 0;

	while(POWER(10, *size) <= number)
	{
		(*size)++;
	}

	uint8_t *tab = calloc(sizeof(*tab), *size);

	for(i = 0; i < *size; i++)
	{
		tab[i] = number / POWER(10, *size - i - 1);

		for(j = i - 1, k = 1; j >= 0; j--, k++)
		{
			tab[i] -= tab[j] * POWER(10, k);
		}
	}

	return tab;
}


int main(int argc, char const *argv[])
{
	(void)argc;
	(void)argv;

	int32_t number = 0;
	scanf("%d", &number);

	uint16_t size = 0;
	uint8_t *tab = puzzledNumber(number, &size);

	if(tab != NULL)
	{
		for(uint16_t i = 0; i < size; i++)
		{
			printf("%d ", tab[i]);
		}

		printf("\n");

		free(tab);
		tab = NULL;
	}

	return 0;
}