#include <stdio.h>

void quadruple(int *a)
{
	int **b = &a;
	int ***c = &b;
	*a = *a * 4;
}

int main()
{
	int x;

	x = 5;
	printf("x before: %d\n", x);
	quadruple(&x);
	printf("x after: %d\n", x);
	printf("x cast: %f\n", (float)x);

	return 0;
}