header.h

#pragma once

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <locale.h>

struct list
{
    char symb;
    struct list* next;
};

char* get_line();

void push(char s, struct list** stack);

char pop(struct list** stack);

int evaluate_quantity(char* expr);

int check_first_bracket(char* expr);

int evaluate_expression(char* expr, struct list* stack);

void free_stack(struct list** stack);

int finish();