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#define ERR_BADFUNCTION -1

#define ERR_BADNUMER -2

#define ERR_GENERAL -3

#define ERR_NOBRACKET -4

#define ERR_BADVARIABLE -5

#define ERR_OVERFLOW -6

#define ERR_BADPARAM -7

// puts the token back to line

void putback(double *hold);

// gets the expression. This function is used externally

int get_exp(double *hold);

void level1(double *hold);

void level1_5(double *hold);

void level2(double *hold);

// works with */%

void level3(double *hold);

// works with ^

void level4(double *hold);

// works with ()

void level5(double *hold);

// works with elementary tokens

void level6(double *hold);

// gets value of number, function or variable

void primitive(double *hold);

// performs arithmetical operation

void arith(char op, double *r, double *h);

void unary(char op, double *r);

// gets variable value by name

extern variable_callback *find_var;

void serror(int code);

// checks the function table to see if such a function exists

int look_up(char *s);

bool strncmp(char *s1, char *s2, int n);

int isdigit(char c);

int isalpha2(char c);

int iswhite(char c);