#define NUMAR 0
#include"getop.h"
#include<stdio.h>
#include<stlib.h>
#include "stiva.h"
void opereaza (int);
void expresie (void);
int x;
char s[50]
void factor (void)
{ if (x=='(') { x=getop (s);
								expresie();
								if (x!=')') eroare();
								x=getop (s);
							}
						else
							 if (x==NUMAR) { opereaza (x);
															 x=getop(); }
							 else eroare() }
 void termen(void)
	{ int op;
		factor();
		while (x=='x'||x=='/') { op=x
														 x=getop (s);
														 factor();
														 opereaza (op);
													 }
									 }
 void expresie (void)
 { int op;
 termen;
 while (x=='+'||x=='-')
              { op=x;
							 x=getop(s);
							 termen()
							 opereaza (op);
							}
 void opereaza (int op)

 { float op1,op2;
	 if (op==NUMAR)
	 push(ataf(s));
	else
	 { op1=top();pop();
		 op2=top();pop(); }
switch (op) { case '+':push(op1+op2); break;
							case '-':push(op1-op2);break ;
}