compito.cpp

#include "compito.h"
#include <cstring>
#include <cstdlib>

#define obj(a, b) (m[((a) - 'A') * r + (b) - 1])

Cinema::Cinema(int n, int p, const char* s){
	if (n > 26 || p > 9){
		cerr << "Cinema troppo grande. Termino il programma.\n";
		exit(1);
		}
	if (strlen(s) > 30){
		cerr << "Nome troppo lungo. Termino il programma.\n";
		exit(1);
		}
	strcpy(name, s);
	r = n;
	c = p;
	m = new bool[r * c];
	for (int a = 0; a < r; ++a)
		for (int b = 0; b < c; ++b)
			m[a * r + b] = false;
	}

ostream& operator<<(ostream& s, const Cinema& cc){
	s << "Nome del cinema: " << cc.name << "\n\n  ";
	for (int a = 1; a <= cc.c; ++a)
		s << a << ' ';
	s << endl;
	char z = 'A';
	for (int a = 0; a < cc.r; ++a){
		s << z++ << ' ';
		for (int b = 0; b < cc.c; ++b)
			switch (cc.m[a * cc.r + b]){
				case true:
					s << "* ";
					break;
				case false:
					s << "  ";
					}
		s << endl;
		}
	return s;
	}

bool Cinema::prenota(char l, int j){
	if (l - 'A' > r || j > c || j < 1 || l - 'A' < 0 || obj(l, j))
		return false;
	obj(l, j) = true;
	return true;
	}

bool Cinema::cancella(char l, int j){
	if (l - 'A' > r) 
		return false;
	if (j > c)
		return false;
	if (j < 1)
		return false;
	if (l - 'A' < 0)
		return false;
	if (!obj(l, j))
		return false;
	obj(l, j) = false;
	return true;
	}

int Cinema::operator!(){
	int d = 0;
	for (int a = 0; a < r * c; ++a)
		if (!m[a])
			++d;
	return d;
	}

Cinema& Cinema::operator=(const Cinema& cc){
	if (this == &cc)
		return *this;
	strcpy(name, cc.name);
	if (cc.r != r || cc.c != c){
		r = cc.r; c = cc.c;
		delete[] m;
		m = new bool[r * c];
		}
	for (int a = 0; a < r * c; ++a)
		m[a] = cc.m[a];
	return *this;
	}

Cinema& Cinema::operator+=(int k){
	if (k < 1 || k > c)
		return *this;
	for (int a = 0; a < r; ++a)
		for (int b = 0; b < c - k; ++b){
			int d;
			for (d = 0; d < k && !m[a * r + b + d]; ++d);
			if (d == k){
				for (d = 0; d < k; ++d)
					m[a * r + b + d] = true;
				return *this;
				}
			}
	return *this;
	}

compito.h

#include <iostream>
using namespace std;

class Cinema{
		bool* m;
		char name[31];
		int r;
		int c;
	public:
		Cinema(int, int, const char*);
		bool prenota(char, int);
		bool cancella(char, int);
		friend ostream& operator<<(ostream&, const Cinema&);
		int operator!();
		Cinema& operator=(const Cinema&);
		Cinema& operator+=(int);
		~Cinema() {delete[] m;};
		};

main.cpp

#include "compito.h"

int main(){
	Cinema c(4, 5, "Puzza"); //Testing constructor
	cout << c; //Testing operator<<
	cout << c.prenota('A', 4);
	cout << c.prenota('A', 1);
	cout << c.prenota('B', 2);
	cout << c.prenota('B', 4);
	cout << c.prenota('C', 1);
	cout << c.prenota('C', 3);
	cout << c.prenota('C', 5);
	cout << c.prenota('D', 4);
	cout << c.prenota('D', 3);
	cout << endl << c;
	c.cancella('C', 1); //Testing cancella
	cout << c.prenota('D', 1);
	cout << c.cancella('C', 5);
	cout << c.cancella('D', 1) << endl;
	cout << c << "Il numero di posti liberi è: " << !c << endl; //Testing operator !
	Cinema c1(7, 2, "Bla");
	c1 = c; //Testing operator =
	cout << c1;
	c1 += 2; //Testing operator +=
	cout << c1;
	return 0; //Testing destructor
	}