uni

commit 7847c7056abf9d1e2e88ef7c3e10f2889d869868
parent c7564e3bbd433a2f887a671fdf6d0ca7d2f77a0b
Author: Christos Margiolis <christos@margiolis.net>
Date:   Wed, 26 Feb 2020 00:13:38 +0200

new assignment

Diffstat:
A
assignment-2.1-fromctocpp/Ex1.cpp
 | 
112
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
assignment-2.1-fromctocpp/assignment-2.1-fromctocpp.cpp
 | 
78
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 190 insertions(+), 0 deletions(-)
diff --git a/assignment-2.1-fromctocpp/Ex1.cpp b/assignment-2.1-fromctocpp/Ex1.cpp
@@ -0,0 +1,112 @@
+#include <iostream>
+#include <string>
+
+
+struct STUD
+{
+    int AM;
+    std::string Name;
+    int Semester;
+};
+
+using namespace std;
+
+STUD * InitStuds ();
+void swap (int &, int &);
+void swap (STUD &, STUD &);
+void ShowStuds (const STUD *, const int);
+void SortStuds (STUD *, int);
+STUD& GetStudBySemester (STUD[], const int, const int);
+int Cube (int len, int=2, int=1);
+
+
+
+
+int main (int argc, char **argv)
+{
+    int a = 20;
+    int b = 30;
+    swap (a, b);
+    cout << "a = " << a << ", b = " << b << endl <<endl;
+    
+    STUD *st = InitStuds ();
+    ShowStuds (st, 3);
+    SortStuds (st, 3);
+    ShowStuds (st, 3);
+    STUD &R = GetStudBySemester (st, 3, 5);
+    R.Name = "Changed";
+    ShowStuds (st, 3);
+    delete[] st;
+    
+    cout << Cube (2, 3, 4) << endl;
+    cout << Cube (2, 3) << endl;
+    cout << Cube (2) << endl;
+}
+
+//Η γνωστή συνάρτηση swap σε cpp έκδοση με references.
+void swap (int &i1, int &i2)
+{
+    int tmp;
+    tmp = i1;
+    i1 = i2;
+    i2 =tmp;
+}
+
+//Η συνάρτηση swap υπερφορτωμένη για struct STUD
+void swap (STUD &i1, STUD &i2)
+{
+    STUD tmp;
+    tmp = i1;
+    i1 = i2;
+    i2 =tmp;
+}
+
+//Δημιουργεί έναν δυναμικό πίνακα 3 θέσεων τύπου STUD και τον αρχικοποιεί "καρφωτά"
+STUD * InitStuds ()
+{
+    STUD *tmp = new STUD [3];
+    tmp[0].AM = 456;
+    tmp[0].Name = "Αντωνίου";
+    tmp[0].Semester = 2;
+    tmp[1].AM = 123;
+    tmp[1].Name = "Βασιλείου";
+    tmp[1].Semester = 1;
+    tmp[2].AM = 789;
+    tmp[2].Name = "Γεωργίου";
+    tmp[2].Semester = 5;
+    return tmp;
+}
+
+//Τυπώνει τα στοιχεία του πίνακα τύπου STUD
+void ShowStuds (const STUD *S, const int N)
+{
+    //N++;
+    for (int i = 0; i < N; i++)
+        cout << S[i].AM << "   " << S[i].Name << "   " << S[i].Semester << endl;
+    cout << endl;
+}
+
+//Ταξινομεί τον πίνακα τύπου STUD
+void SortStuds (STUD *S, int N)
+{
+    for (int i = 0; i < N - 1; i++)
+        for (int j = i + 1; j < N; j++) 
+            if (S[i].AM > S[j].AM)
+                swap (S[i], S[j]);
+}
+    
+//Παράδειγμα συνάρτησης που επιστρέφει αναφορά
+STUD& GetStudBySemester (STUD D[], const int S, const int Semester)
+{
+    int i;
+    for (i = 0; i < S; i++)
+        if (D[i].Semester == Semester)
+            return D[i];
+    return D[0];
+}
+
+int Cube (int len, int wid, int hei)
+{
+    return len * wid * hei;
+}
+
diff --git a/assignment-2.1-fromctocpp/assignment-2.1-fromctocpp.cpp b/assignment-2.1-fromctocpp/assignment-2.1-fromctocpp.cpp
@@ -0,0 +1,78 @@
+#include <iostream>
+#include <string>
+
+class Human
+{
+	private:
+		std::string name;
+		int age;
+
+	public:
+		Human(std::string name) {this->name = name;}
+		std::string getname() const {return name;}
+};
+
+int modconst(int *, int);
+void chnames(std::string *, int);
+void getnames(std::string *, int);
+int chval(int &, int);
+int& ref(int *, int);
+std::string defaultargs(std::string = "No");
+
+int main(int argc, char **argv)
+{
+	// Ερώτημα 1 
+	const int x = 10;
+	std::cout << "Old const value: " << x << std::endl << "New const value: " << modconst((int *)&x, 15) << std::endl << std::endl;
+
+	// Ερώτημα 2
+	Human *human = new Human("Christos");
+	std::string *names = new std::string[3];
+	std::cout << human->getname() << std::endl << std::endl;
+
+	chnames(names, 3);
+	std::cout << std::endl;
+	getnames(names, 3);
+	std::cout << std::endl;
+
+	delete human;
+	delete[] names;
+
+	// Ερώτημα 3
+	int y = 5;
+	std::cout << "Old y value: " << y << std::endl << "New y value: " << chval(y, 10) << std::endl << std::endl;
+
+	int	*arr = new int[3];
+	for (int i = 0; i < 2; i++) arr[i] = i;
+	std::cout << "Old value at index 1: " << arr[1] << std::endl;
+	ref(arr, 1) = 500;
+	std::cout << "New value at index 1: " << arr[1] << std::endl << std::endl;
+	delete[] arr;
+
+	// Ερώτημα 4
+	std::cout << "Function return values: " << std::endl;
+	std::cout << "With default arg: " << defaultargs() << std::endl;
+	std::cout << "Without default arg: " << defaultargs("Yes") << std::endl; 
+
+	return 0;
+}
+
+void chnames(std::string *names, int numNames)
+{
+	for (int i = 0; i < numNames; i++)
+	{
+		std::cout << "Name " << i << ": ";
+		std::cin >> names[i];
+	}
+}
+
+void getnames(std::string *names, int numNames)
+{
+	for (int i = 0; i < numNames; i++)
+		std::cout << "Name " << i << ": " << names[i] << std::endl;
+}
+
+int modconst(int *x, int newVal) {return *x = newVal;}
+int chval(int &y, int newVal) {return y = newVal;}
+int& ref(int *arr, int index) {return arr[index];}
+std::string defaultargs(std::string arg) {return arg;}