eval.c

int eval(int Sign, int *Pool)	{
	int bufSign;
	bufSign = Sign;

	if(bufSign == '+' )	{
		Pool->value[ Pool->num-2 ] = Pool->value[ Pool->num-2 ] + Pool->value[ Pool->num-1 ];
	}
	else if (bufSign == '-')	{
		Pool->value[ Pool->num-2 ] = Pool->value[ Pool->num-2 ] - Pool->value[ Pool->num-1 ];
	}
	else if (bufSign == '*')	{
		Pool->value[ Pool->num-2 ] = Pool->value[ Pool->num-2 ] * Pool->value[ Pool->num-1 ];
	}
	else if (bufSign == '/')	{
		Pool->value[ Pool->num-2 ] = Pool->value[ Pool->num-2 ] / Pool->value[ Pool->num-1 ];
	}

	Pool->num--; //Pool.num[ Pool.num  ] = Pool.num-1; 
}