Ultima cifra a^b

Ultima cifra a lui a^b

unsigned uc(unsigned a, unsigned b)
{
unsigned c=a%10;
if(c==0 || c==1 || c==5 || c==6)
	return c;
else
switch(c)
{
case 2:
{
	switch(b%4)
{
		case 0:
			return 6;
		case 1:
			return 2;
		case 2:
			return 8;
		case 3:
			return c;
}
}
case 3:
{
	switch(b%4)
{
		case 0:
			return 6;
		case 1:
			return 2;
		case 2:
			return 8;
		case 3:
			return c;
}
}
case 4:
{
	switch(b%4)
{
		case 0:
			return 6;
		case 1:
			return 2;
		case 2:
			return 8;
		case 3:
			return c;
}
}
case 7:
{
	switch(b%4)
{
		case 0:
			return 6;
		case 1:
			return 2;
		case 2:
			return 8;
		case 3:
			return c;
}
}
case 8:
{
	switch(b%4)
{
		case 0:
			return 6;
		case 1:
			return 2;
		case 2:
			return 8;
		case 3:
			return c;
}
}
case 9:
{
	switch(b%4)
{
		case 0:
			return 6;
		case 1:
			return 2;
		case 2:
			return 8;
		case 3:
			return c;
}
}
}
}