10 files changed, 173 insertions, 0 deletions
diff --git a/CPP/cpp_book/chap3/.grades.cpp.un~ b/CPP/cpp_book/chap3/.grades.cpp.un~
new file mode 100644
index 0000000..4d93a46
--- /dev/null
+++ b/CPP/cpp_book/chap3/.grades.cpp.un~
diff --git a/CPP/cpp_book/chap3/grade.cpp b/CPP/cpp_book/chap3/grade.cpp
new file mode 100644
index 0000000..0a08217
--- /dev/null
+++ b/CPP/cpp_book/chap3/grade.cpp
@@ -0,0 +1,27 @@
+#include <vector>
+#include "student_info.h"
+#include "median.h"
+#include "grade.h"
+
+double grade(double midterm, double final, double homework)
+{
+	return (midterm * 0.2 +
+		final * 0.4 +
+		homework * 0.4);
+}
+
+/* Overloads above grade() */
+double grade(double midterm, double final, const std::vector<double>& hw)
+{
+	if (hw.size() == 0)
+		throw std::domain_error("Student has no homework");
+
+	return grade(midterm, final, median(hw));
+}
+
+double grade(const StudentInfo& s)
+{
+	return grade(s.midterm, s.final, s.homework);
+}
+
+
diff --git a/CPP/cpp_book/chap3/grade.h b/CPP/cpp_book/chap3/grade.h
new file mode 100644
index 0000000..7cd73d1
--- /dev/null
+++ b/CPP/cpp_book/chap3/grade.h
@@ -0,0 +1,11 @@
+#ifndef GRADE_H
+#define GRADE_H
+
+#include <vector>
+#include "student_info.h"
+
+double grade(double midterm, double final, double homework);
+double grade(double midterm, double final, const std::vector<double>& hw);
+double grade(const StudentInfo& s);
+
+#endif /* GRADE_H */
diff --git a/CPP/cpp_book/chap3/grades b/CPP/cpp_book/chap3/grades
new file mode 100755
index 0000000..f086657
--- /dev/null
+++ b/CPP/cpp_book/chap3/grades
diff --git a/CPP/cpp_book/chap3/grades.cpp b/CPP/cpp_book/chap3/grades.cpp
new file mode 100644
index 0000000..3c8f19a
--- /dev/null
+++ b/CPP/cpp_book/chap3/grades.cpp
@@ -0,0 +1,48 @@
+#include <iomanip>	// IO Manipulators
+#include <ios>
+#include <iostream>
+#include <string>
+#include <vector>
+#include <algorithm>
+#include <stdexcept>
+#include "grade.h"
+#include "student_info.h"
+
+using std::cin;		using std::string;
+using std::cout;	using std::endl;
+
+int
+main(void)
+{
+	std::vector<StudentInfo> students;
+	StudentInfo record;
+	string::size_type maxlen = 0;
+
+	while (read_student(cin, record)) {
+		maxlen = std::max(maxlen, record.name.size());
+		students.push_back(record);
+	}
+
+	sort(students.begin(), students.end(), compare_students);
+
+	for (std::vector<StudentInfo>::size_type i = 0;
+	     i != students.size();
+	     i++) {
+
+		cout << students[i].name
+		     << string(maxlen + 1 - students[i].name.size(), ' ');
+
+		try {
+			double final_grade = grade(students[i]);
+
+			std::streamsize prec = cout.precision();
+			cout << std::setprecision(3) << final_grade
+			     << std::setprecision(prec);
+		} catch (std::domain_error& e){
+			cout << e.what();
+		}
+
+		cout << endl;
+	}
+	return 0;
+}
diff --git a/CPP/cpp_book/chap3/median.cpp b/CPP/cpp_book/chap3/median.cpp
new file mode 100644
index 0000000..e9932e8
--- /dev/null
+++ b/CPP/cpp_book/chap3/median.cpp
@@ -0,0 +1,21 @@
+#include <vector>
+#include <algorithm>
+#include <stdexcept>
+
+double median(std::vector<double> vec)
+{
+	std::vector<double>::size_type mid, size;
+
+	size = vec.size();
+
+	if (size == 0)
+		throw std::domain_error("median of an empty vector");
+
+	sort(vec.begin(), vec.end());
+
+	mid = size / 2;
+
+	return size % 2 == 0 ? (vec[mid] + vec[mid - 1]) / 2
+			     : vec[mid];
+
+}
diff --git a/CPP/cpp_book/chap3/median.h b/CPP/cpp_book/chap3/median.h
new file mode 100644
index 0000000..f4e6580
--- /dev/null
+++ b/CPP/cpp_book/chap3/median.h
@@ -0,0 +1,8 @@
+#ifndef MEDIAN_H
+#define MEDIAN_H
+
+#include <vector>
+
+double median(std::vector<double> vec);
+
+#endif /* MEDIAN_H */
diff --git a/CPP/cpp_book/chap3/student_info.cpp b/CPP/cpp_book/chap3/student_info.cpp
new file mode 100644
index 0000000..a55338b
--- /dev/null
+++ b/CPP/cpp_book/chap3/student_info.cpp
@@ -0,0 +1,34 @@
+#include "student_info.h"
+
+bool compare_students(const StudentInfo& a, const StudentInfo& b)
+{
+	return a.name < b.name;
+}
+
+std::istream& read_homework(std::istream& in, std::vector<double>& hw)
+{
+	if (in) {
+		hw.clear();	// Empty the vector.
+
+		double x;
+		/*
+		 * Loop invariant:
+		 *	- 'homework' contains all the homework grades read so far
+		 */
+		while (in >> x)
+			hw.push_back(x);
+
+		in.clear();	// Clear the stream in case
+				// it will be used again.
+	}
+	return in;
+}
+
+std::istream& read_student(std::istream& is, StudentInfo& s)
+{
+	/* Read and store student's name, midterm and final */
+	is >> s.name >> s.midterm >> s.final;
+
+	read_homework(is, s.homework);
+	return is;
+}
diff --git a/CPP/cpp_book/chap3/student_info.h b/CPP/cpp_book/chap3/student_info.h
new file mode 100644
index 0000000..697f3c0
--- /dev/null
+++ b/CPP/cpp_book/chap3/student_info.h
@@ -0,0 +1,20 @@
+#ifndef STUDENT_INFO_H
+#define STUDENT_INFO_H
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+struct StudentInfo {
+	std::string name;
+	double midterm;
+	double final;
+	std::vector<double> homework;
+};
+
+
+bool compare_students(const StudentInfo& a, const StudentInfo& b);
+std::istream& read_homework(std::istream& in, std::vector<double>& hw);
+std::istream& read_student(std::istream& is, StudentInfo& s);
+
+#endif /* STUDENT_INFO_H */
diff --git a/CPP/cpp_book/chap3/tags b/CPP/cpp_book/chap3/tags
new file mode 100644
index 0000000..acf7309
--- /dev/null
+++ b/CPP/cpp_book/chap3/tags
@@ -0,0 +1,4 @@
+Mgrades.cpp	grades.cpp	/^main(void)$/
+grade	grades.cpp	/^double grade(double midterm, double final, double /
+median	grades.cpp	/^double median(std::vector<double> vec)$/
+read_homework	grades.cpp	/^istream& read_homework(istream& in, std::vector<do/