2024年12月完成（补充提交）

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 3/Student_info.cpp

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+// source file for `Student_info'-related functions
+#include "Student_info.h"
+
+using std::istream;  using std::vector;
+
+bool compare(const Student_info& x, const Student_info& y)
+{
+	return x.name < y.name;
+}
+
+istream& read(istream& is, Student_info& s)
+{
+	// read and store the student's name and midterm and final exam grades
+	is >> s.name >> s.midterm >> s.final;
+
+	read_hw(is, s.homework);  // read and store all the student's homework grades
+	return is;
+}
+
+// read homework grades from an input stream into a `vector<double>'
+istream& read_hw(istream& in, vector<double>& hw)
+{
+	if (in) {
+		// get rid of previous contents
+		hw.clear();
+
+		// read homework grades
+		double x;
+		while (in >> x)
+			hw.push_back(x);
+
+		// clear the stream so that input will work for the next student
+		in.clear();
+	}
+	return in;
+}
+

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 3/Student_info.h

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+#ifndef GUARD_Student_info
+#define GUARD_Student_info
+
+// `Student_info.h' header file
+#include <iostream>
+#include <string>
+#include <vector>
+
+struct Student_info {
+	std::string name;
+	double midterm, final;
+	std::vector<double> homework;
+};
+
+bool compare(const Student_info&, const Student_info&);
+std::istream& read(std::istream&, Student_info&);
+std::istream& read_hw(std::istream&, std::vector<double>&);
+#endif
+

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 3/grade.cpp

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+#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;
+}
+
+bool pgrade(const Student_info& s)
+{
+	return !fgrade(s);
+}
+

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 3/grade.h

@@ -0,0 +1,14 @@
+#ifndef GUARD_grade_h
+#define GUARD_grade_h
+
+#include <vector>
+#include "Student_info.h"
+
+double grade(double, double, double);
+double grade(double, double, const std::vector<double>&);
+double grade(const Student_info&);
+
+bool pgrade(const Student_info&);
+bool fgrade(const Student_info&);
+
+#endif

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 3/main.cpp

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+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include "Student_info.h"
+#include "grade.h"
+
+using std::cin;
+using std::cout;
+using std::endl;
+using std::string;
+using std::vector;
+
+// 定义常量：及格分数
+const double PASS_GRADE = 60.0;
+
+int main() {
+    vector<Student_info> students;
+    Student_info record;
+
+    // 读取学生信息
+    cout << "期中成绩占比20%、期末成绩占比40%，平时成绩占比40%）:" << endl;
+    cout << "输入学生信息（姓名、期中成绩、期末成绩，平时成绩）:" << endl;
+    cout << "输入Ctrl+z后回车退出。" << endl;
+
+    while (read(cin, record)) {
+        students.push_back(record);
+    }
+
+    // 将学生分为及格和不及格两组
+    vector<Student_info> pass, fail;
+    for (const auto& student : students) {
+        if (grade(student) >= PASS_GRADE) {
+            pass.push_back(student);
+        }
+        else {
+            fail.push_back(student);
+        }
+    }
+
+    // 按名字排序
+    std::sort(pass.begin(), pass.end(), compare);
+    std::sort(fail.begin(), fail.end(), compare);
+
+    // 输出及格学生信息
+    cout << "合格学生:" << endl;
+    for (const auto& student : pass) {
+        cout << student.name << ": 总成绩 = " << grade(student) << endl;
+    }
+
+    // 输出不及格学生信息
+    cout << "不合格学生:" << endl;
+    for (const auto& student : fail) {
+        cout << student.name << ": 总成绩 = " << grade(student) << endl;
+    }
+
+    return 0;
+}

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 3/median.cpp

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+// source file for the `median' function
+#include <algorithm>    // to get the declaration of `sort'
+#include <stdexcept>    // to get the declaration of `domain_error'
+#include <vector>       // to get the declaration of `vector'
+
+using std::domain_error;   using std::sort;   using std::vector;
+
+#include "median.h"
+
+// compute the median of a `vector<double>'
+// note that calling this function copies the entire argument `vector'
+double median(vector<double> vec)
+{
+#ifdef _MSC_VER
+	typedef std::vector<double>::size_type vec_sz;
+#else
+	typedef vector<double>::size_type vec_sz;
+#endif
+
+	vec_sz size = vec.size();
+	if (size == 0)
+		throw domain_error("median of an empty vector");
+
+	sort(vec.begin(), vec.end());
+
+	vec_sz mid = size/2;
+
+	return size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid];
+}
+

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 3/median.h

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+#ifndef GUARD_median_h
+#define GUARD_median_h
+
+// `median.h'--final version
+#include <vector>
+double median(std::vector<double>);
+
+#endif
+