text: #ifndef GUARD_grade_h
  #define GUARD_grade_h
  
  #include <vector>
  
  #include "Student_info.h"
  
  double grade(const Student_info& student);
  double grade(double midterm, double final, double homework);
  double grade(double midterm, double final, const std::vector<double>& hw);
  
  #endif
  