add positiv_zero in output

headers/computorv1.h

@@ -206,6 +206,7 @@ void print_solution(s_solution *solution);
 bool is_nearly_equal(double num, int compare);
 bool is_nearly_equal_zero(double num);
 const s_polynom *get_term_of_power(const s_polynom *polynom, int power);
+double positiv_zero(double num);
 bool has_decimal_part(double num);
 bool any_has_decimal_part(double *num, size_t len);
 int gcd_int(int a, int b);