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void putback(double *hold);

// gets the expression. This function is used externally

int get_exp(double *hold);

// works with +-

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);

// performs unary (one-operand) operation

void unary(char op, double *r);

// gets variable value by name

double find_var(char *s);

// stops execution of parser and return error code

void serror(int code);

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

int look_up(char *s);