Chapter 4 - Completed

Author: Kevin Languasco

.gitignore

@@ -1,3 +1,4 @@
 .ycm_extra_conf.py
 .color_coded
 _vimrc_local.vim
+*.o

4-organizing_programs_and_data/Student_info.cpp

@@ -0,0 +1,33 @@
+#include "Student_info.h"
+
+using std::istream;
+using std::vector;
+using std::cout;
+
+bool compare(const Student_info& x, const Student_info& y) {
+    return x.name < y.name;
+}
+
+istream& read(istream& is, Student_info& s) {
+    cout << "Please enter the name, midterm grade and final grade: ";
+    is >> s.name >> s.midterm >> s.final;
+    read_hw(is, s.homework);
+    return is;
+}
+
+istream& read_hw(istream& in, vector<double>& hw) {
+    if (in) {
+        cout << "if(in)... Homework grades: ";
+        // get rid of previous contents
+        hw.clear();
+        // read the 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;
+}
+
+

4-organizing_programs_and_data/Student_info.h

@@ -0,0 +1,18 @@
+#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

4-organizing_programs_and_data/evaluate

@@ -1,38 +1,16 @@
-#include <iostream>
 #include <vector>
-#include <algorithm>
 #include <stdexcept>
-#include <string>
-#include <ios>
-#include <iomanip>
+#include "grades.h"
+#include "median.h"
+#include "Student_info.h"
 
-using std::vector;
-using std::sort;
 using std::domain_error;
-using std::istream;
-using std::string;
-using std::cin;
-using std::cout;
-using std::endl;
-using std::setprecision;
-using std::streamsize;
+using std::vector;
 
 double grade(double midterm, double final, double homework) {
     return 0.2 * midterm + 0.4 * final + 0.4 * homework;
 }
 
-double median(vector<double> vec) {
-    typedef vector<double>::size_type vec_sz;
-    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];
-}
 
 // overloading
 double grade(double midterm, double final, const vector<double>& hw) {
@@ -41,43 +19,8 @@ double grade(double midterm, double final, const vector<double>& hw) {
     return grade(midterm, final, median(hw));
 }
 
-istream& read_hw(istream& in, vector<double>& hw) {
-    if (in) {
-        // get rid of previous contents
-        hw.clear();
-        // read the 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;
-}
-
-int main() {
-    cout << "Please enter your first name: ";
-    string name;
-    cin >> name;
-    cout << "Hello, " << name << "!" << endl;
-    cout << "Please enter your midterm and final exam grades: ";
-    double midterm, final;
-    cin >> midterm >> final;
-    cout << "Enter all your homework grades, "
-        "followed by end-of-file: ";
-    vector<double> homework;
-    read_hw(cin, homework);
-    try {
-        double final_grade = grade(midterm, final, homework);
-        streamsize prec = cout.precision();
-        cout << "Your final grade is " << setprecision(3)
-            << final_grade << setprecision(prec) << endl;
-    } catch (domain_error) {
-        cout << endl << "You must enter your grades. "
-            "Please try again." << endl;
-        return 1;
-    }
-    return 0;
+double grade(const Student_info& s) {
+    return grade(s.midterm, s.final, s.homework);
 }
 
 

4-organizing_programs_and_data/grades

@@ -0,0 +1,11 @@
+#ifndef GUARD_grades_h
+#define GUARD_grades_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&);
+
+#endif

4-organizing_programs_and_data/grades.cpp

@@ -0,0 +1,48 @@
+#include <algorithm>
+#include <iomanip>
+#include <ios>
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <vector>
+#include "grades.h"
+#include "Student_info.h"
+
+using std::cin;
+using std::cout;
+using std::domain_error;
+using std::endl;
+using std::max;
+using std::setprecision;
+using std::sort;
+using std::streamsize;
+using std::string;
+using std::vector;
+
+int main() {
+    vector<Student_info> students;
+    Student_info record;
+    string::size_type maxlen = 0;
+
+    while(read(cin, record)) {
+        maxlen = max(maxlen, record.name.size());
+        students.push_back(record);
+    }
+    sort(students.begin(), students.end(), compare);
+
+    for (vector<Student_info>::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]);
+            streamsize prec = cout.precision();
+            cout << setprecision(3) << final_grade
+                << setprecision(prec);
+        } catch (domain_error e) {
+            cout << e.what();
+        }
+        cout << endl;
+    }
+    return 0;
+}
+

4-organizing_programs_and_data/grades.h

@@ -1,4 +1,22 @@
 CXX = clang++
-C = clang++
+CC = clang++
+
+CFLAGS = -g -Wall
+
+all: evaluate
+
+evaluate: main.o median.o Student_info.o grades.o
+	$(CXX) $(CFLAGS) -o evaluate main.o median.o Student_info.o grades.o
+
+main.o: main.cpp grades.h Student_info.h
+	$(CXX) $(CFLAGS) -c main.cpp
+
+median.o: median.cpp median.h
+	$(CXX) $(CFLAGS) -c median.cpp
+
+Student_info.o: Student_info.cpp Student_info.h
+	$(CXX) $(CFLAGS) -c Student_info.cpp
+
+grades.o: grades.cpp grades.h median.h Student_info.h
+	$(CXX) $(CFLAGS) -c grades.cpp
 
-all: grades

4-organizing_programs_and_data/main.cpp

@@ -0,0 +1,21 @@
+#include <algorithm>
+#include <stdexcept>
+#include <vector>
+
+using std::domain_error;
+using std::sort;
+using std::vector;
+
+double median(vector<double> vec) {
+    typedef vector<double>::size_type vec_sz;
+    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];
+}
+

4-organizing_programs_and_data/makefile

@@ -0,0 +1,7 @@
+#ifndef GUARD_median_h
+#define GUARD_median_h
+
+#include <vector>
+double median(std::vector<double>);
+
+#endif