Ex4.*, did not finish Ex4.2

ex4.1/Cable.hh

@@ -1,4 +1,6 @@
 
+#ifndef CABLE_HH
+#define CABLE_HH
 #include <iostream>
 
 class Cable {
@@ -11,3 +13,4 @@ public:
 private:
 
 } ;
+#endif

ex4.1/Dialer.hh

@@ -7,13 +7,28 @@
 class Dialer {
 public:
 
-  Dialer() { std::cout << "Dialer Constructor " << this << std::endl ; }
-  Dialer(const Dialer&) { std::cout << "Dialer Copy Constructor " << this << std::endl ; }
-  ~Dialer() { std::cout << "Dialer Destructor " << this << std::endl ; }
+  Dialer() {
+	  std::cout << "Dialer Constructor " << this << std::endl ;
+	  init();
+  }
+  Dialer(const Dialer& other) {
+	  std::cout << "Dialer Copy Constructor " << this << std::endl ;
+
+	  init();
+  }
+  ~Dialer() {
+	  std::cout << "Dialer Destructor " << this << std::endl ; 
+	  delete[] buttons ;
+  }
 
 private:
 
-  Button buttons[12] ;
+  void init()
+  {
+	  buttons = new Button[12];
+  }
+	  
+  Button* buttons ;
 
 } ;
 

ex4.1/Telephone.hh

@@ -10,7 +10,7 @@ class Telephone {
 public:
 
   Telephone() { std::cout << "Telephone Constructor " << this << std::endl ; }
-  Telephone(const Telephone&) { std::cout << "Telephone Copy Constructor " << this << std::endl ; }
+  Telephone(const Telephone& t ) { std::cout << "Telephone Copy Constructor " << this << std::endl ; }
   ~Telephone() { std::cout << "Telephone Destructor " << this << std::endl ; }
 
 private:

ex4.1/main.cpp

@@ -0,0 +1,7 @@
+#include "Telephone.hh"
+
+int main(){
+	Telephone t;
+
+	Telephone t2 = t;
+}

ex4.1/tree.txt

@@ -0,0 +1,41 @@
+==========================================================================
+a)                                                                   
+==========================================================================
+
+                      +-----------+                                      
+                      | Telephone |                                      
+                      +-----------+                                      
+                            |                                            
+                            |                                            
+    +------------>-------->-+-----<---------<-------+                    
+    |                |               |              |                    
++-------+	+---------+	        +--------+    +---------+                
+| Cable |->-| Handset |	        | Dialer |    | Housing |                
++-------+	+---------+	        +--------+    +---------+                
+                |                    |              |                    
+       +-->-----+--<-+               |              +---------------+    
+       |             |               |              |               |    
++-----------+    +----------+    +--------+      +---------+    +-------+
+| Moutpiece |    | Earpiece |    | Button |      | Chassis |    | Shell |
++-----------+    +----------+    +--------+      +---------+    +-------+
+
+==========================================================================
+b)
+==========================================================================
+
+In file included from Handset.hh:7,
+                 from Telephone.hh:7:
+Cable.hh:4:7: fout: redefinition of ‘class Cable’
+    4 | class Cable {
+      |       ^~~~~
+In file included from Telephone.hh:4:
+Cable.hh:4:7: note: previous definition of ‘class Cable’
+    4 | class Cable {
+      |       ^~~~~
+
+Header protectors missing in Cable.hh
+
+==========================================================================
+e)
+==========================================================================
+Yes, it does.

ex4.2/CaloCell.cc

@@ -0,0 +1,18 @@
+//CaloGrid.cc
+#include <iostream>
+#include "CaloGrid.hh"
+
+CaloCell* CaloGrid::cell(int x, int y ) {
+	if ( x > nx or x < 0 ) {
+		std::cout << "CaloGrid::cell() Error: out of grid (x)" << std::endl ;
+		return nullptr;
+	}
+
+	if ( y > ny or y < 0 ) {
+		std::cout << "CaloGrid::cell() Error: out of grid (y)" << std::endl ;
+		return nullptr;
+	}
+
+	return cells[ x*nx + y ] ;
+}
+

ex4.2/CaloCell.hh

@@ -0,0 +1,31 @@
+//CaloCell.hh
+#ifndef CALOCELL_HH
+#define CALOCELL_HH
+
+
+class CaloCell
+{
+	public:
+		CaloCell() { init( 0, 0 ); }
+		CaloCell( double energy, int ID ) {
+			init( energy, ID );
+		}
+		// No need for Constructor or Destructor
+
+		double getEnergy() const { return energy; }
+		bool setEnergy( double new_energy ) { return (energy = new_energy) ; }
+
+		int getId() const { return ID ; }
+		bool setId( int new_id ) { return ( ID = new_id ) ; }
+
+
+	private:
+		void init( double init_energy, int ID )
+		{
+			setEnergy( init_energy );
+			setId( ID );
+		}
+		int ID ;
+		double energy ;
+};
+#endif

ex4.2/CaloGrid.cc

@@ -0,0 +1,18 @@
+//CaloGrid.cc
+#include <iostream>
+#include "CaloGrid.hh"
+
+CaloCell* CaloGrid::cell(int x, int y ) {
+	if ( x > nx or x < 0 ) {
+		std::cout << "CaloGrid::cell() Error: out of grid (x)" << std::endl ;
+		return nullptr;
+	}
+
+	if ( y > ny or y < 0 ) {
+		std::cout << "CaloGrid::cell() Error: out of grid (y)" << std::endl ;
+		return nullptr;
+	}
+
+	return cells[ x * nx + y ] ;
+}
+

ex4.2/CaloGrid.hh

@@ -0,0 +1,42 @@
+//CaloGrid.hh
+
+#include "CaloCell.hh"
+
+#ifndef CALOGRID_HH
+#define CALOGRID_HH
+class CaloGrid
+{
+	public:
+		CaloGrid( int nx, int ny ) {
+			init(nx, ny );
+		}
+		CaloGrid( const CaloGrid& other ) {
+			// Set everything using init to allocate memory
+			init(other.nx, other.ny ) ;
+
+			// Copy elements
+			// Because we make it a 1Dim array, we can simply run over all elements in one go
+			for (int i=0 ; i<nx*ny ; i++ ) {
+				cells[i] = other.cells[i] ;
+			}
+		}
+		~CaloGrid() {
+			delete[] cells;
+		}
+
+		CaloCell* cell(int x, int y);
+
+
+	private:
+		int nx, ny ;
+		CaloCell* cells ;
+
+		void init( int in_nx, int in_ny ) {
+			nx = in_nx ;
+			ny = in_ny ;
+
+			// contigious cells
+			cells = new CaloCell[ nx*ny ];
+		}
+} ;
+#endif

ex4.2/Calorimeter.hh

@@ -0,0 +1,9 @@
+//Calorimeter.hh
+#ifndef CALORIMETER_HH
+#define CALORIMETER_HH
+
+
+class Calorimeter
+{
+}
+#endif

ex4.2/Point.hh

@@ -0,0 +1,35 @@
+//Point.hh
+#ifndef POINT_HH
+#define POINT_HH
+
+
+class Point
+{
+	public:
+		Point() { init(0, 0, 0) ; }
+		Point( double x, double y, double z ) { init( x, y, z ); }
+
+		int getX() const { return x ; }
+		bool setX( int new_x ) { return ( x = new_x ) ; }
+	
+		int getY() const { return y ; }
+		bool setY( int new_y ) { return ( y = new_y ) ; }
+
+		int getZ() const { return z ; }
+		bool setZ( int new_z ) { return ( z = new_z ) ; }
+
+		void setPoint( double in_x, double in_y, double in_z ) {
+			x = in_x ;
+			y = in_y ;
+			z = in_z ;
+		}
+
+	
+	private:
+		void init( double x, double y, double z ) {
+			setPoint( x, y, z );
+		}
+
+		double x, y, z = 0 ;
+};
+#endif

ex4.2/main.cpp

@@ -0,0 +1,13 @@
+#include "CaloCell.hh"
+#include "CaloGrid.hh"
+#include "Point.hh"
+
+int main() {
+	CaloCell cell(0, 1) ;
+	Point p ;
+
+	CaloGrid grid(2, 2) ;
+
+
+	grid.cell(1, 1);
+}

ex4.3/String.cc

@@ -0,0 +1,30 @@
+//String.cc
+#include "String.hh"
+
+String operator+( const String& lhs, const String& rhs ) {
+	String result(lhs); // Copy lhs into res with constructor
+	result += rhs ; // Use operator+= function which is a member of the class
+	return result ;
+}
+
+String& String::operator=( const String& a ) {
+		if ( &a != this ) {
+			insert(a._s) ;
+		}
+
+		return *this ;
+}
+String& String::operator+=( const String& a ) {
+	  int newlen = _len + a._len ;
+	  char * newstr = new char[ newlen+1 ] ;
+
+	  strcpy(newstr, _s) ;
+	  strcpy(newstr + _len, a._s) ;
+
+	  if (_s) delete[] _s ;
+	  
+	  _s = newstr ;
+	  _len = newlen ;
+
+	  return *this ;
+}

ex4.3/String.hh

@@ -1,6 +1,7 @@
+#include <cstring>
+
 #ifndef STRING_HH
 #define STRING_HH
-
 class String {
 public:
 
@@ -8,9 +9,15 @@ public:
   String(const String& a)  : _s(0) { insert(a._s) ; }
   ~String() { delete[] _s ; }
 
+  String& operator=( const String& a );
+  String& operator+=( const String& a );
+
+  operator const char* const() { return data(); }
+
   int length() const { return _len ; }
   const char* data() const { return _s ; }
 
+
 private:
 
   char* _s ;

ex4.3/main.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <cstring>
+#include "String.hh"
+
+int main() {
+	String str("Blubaloo");
+	std::cout << "String '" << str.data() << "' is " << str.length() << " chars long." << std::endl;
+
+
+	// Chain Assignment 
+	std::cout << "String assignment" << std::endl;
+	String a, b;
+	a = b = String("Empty");
+	std::cout << "String '" << a.data() << "' is " << a.length() << " chars long." << std::endl;
+	std::cout << "String '" << b.data() << "' is " << b.length() << " chars long." << std::endl;
+
+
+	// Operator+
+	std::cout << "Operator +" << std::endl;
+	a = String("Loose") + String(" Statement");
+	std::cout << "String '" << a.data() << "' is " << a.length() << " chars long." << std::endl;
+
+
+	// Operator+=
+	std::cout << "Operator +=" << std::endl;
+	b += " " ; // String takes a const char* as input to constructor, so autoconversion available
+	b += a ;
+	std::cout << "String '" << b.data() << "' is " << b.length() << " chars long." << std::endl;
+
+	// Type Conversion
+	std::cout << "Type Conversion" << std::endl;
+	String c("Almost Empty");
+
+	std::cout << "String '" << c.data() << "' is " << strlen(c) << " chars long." << std::endl;
+}