void SUMA (VTC100I a, VTC100I b, VTC100I c)
	{
		A_ZERO(c);
		int q,r;
    	for (int x=99; x>=2; x--)
		{
			c[x] = a[x] + b[x];
			if (c[x] >= 10)
			{
				DIVIDIR(c[x],10,q,r);
				c[x] = r;
				a[x-1] = a[x-1] + q;
			}
    	}
    	COMPTA_XIFRES(c, c[1]);
	}