double int_to_valuetype(int);

double int_to_exptype(double);

bool is_greater(double,double);

double maximum(double,double);

double sum(double,double);

double difference(double,double);

double product(double,double);

double ratio(double,double);

double absolute(double);

double power(double,double);

double to_double(double);

double to_string(char*,double);

double root_to_string(char*,double,double);