#ifndef CALCULATOR_H
#define CALCULATOR_H

#include <stdbool.h>

double evaluate_expression(const char *expression, bool *error);
bool is_operator(char c);
int get_priority(char op);
bool is_function(const char *str, int *length);
double apply_operator(double a, double b, char op);
double apply_function(const char *func, double value, bool *error);

#endif