grade.cpp

Accelerated c++ 電子書 對 c++ container 多有描述

#include <stdexcept>
#include <vector>
#include "grade.h"
#include "median.h"
#include "Student_info.h"

using std::domain_error;  using std::vector;


// compute a student's overall grade from midterm and final exam grades and homework grade
double grade(double midterm, double final, double homework)
{
	return 0.2 * midterm + 0.4 * final + 0.4 * homework;
}

// compute a student's overall grade from midterm and final exam grades
// and vector of homework grades.
// this function does not copy its argument, because `median' does so for us.
double grade(double midterm, double final, const vector<double>& hw)
{
	if (hw.size() == 0)
		throw domain_error("student has done no homework");
	return grade(midterm, final, median(hw));
}

double grade(const Student_info& s)
{
	return grade(s.midterm, s.final, s.homework);
}

// predicate to determine whether a student failed
bool fgrade(const Student_info& s)
{
	return grade(s) < 60;
}