chore: ex D lab15/2/19

1 files changed, 159 insertions, 0 deletions

diff --git a/I_anno/Programmazione_1/lab_15_02_19_D.cc b/I_anno/Programmazione_1/lab_15_02_19_D.cc
new file mode 100644
index 0000000..b050e72
--- /dev/null
+++ b/I_anno/Programmazione_1/lab_15_02_19_D.cc
@@ -0,0 +1,159 @@
+#include<iostream>
+#include<stdexcept>
+#define DIM 50
+
+using namespace std;
+
+class A {
+public:
+	A(short m, short k) : len{m} {
+		ptr = new int[len];
+		srand(time(NULL));
+		
+		for(int i = 0; i < len; ++i) {
+			ptr[i] = rand()%k + 1;
+		}
+	}
+
+	~A() {
+		delete ptr;
+	}
+
+	virtual double const f() = 0;
+	void print(ostream& os) {
+		os << typeid(*this).name() << ", ptr=[ ";
+		for(int i = 0; i < len; ++i)
+			os << ptr[i] << ' ';
+
+		os << "]";
+	}
+
+	int get(short i) {
+		if(i >= len)
+			throw out_of_range{"out of range"};
+
+	 	return ptr[i];
+	}
+
+	short getLen() {
+		return len;
+	}
+
+	int& operator[](int x){ 
+		return ptr[x];
+	}
+
+	const int& operator[](int x) const { 
+		return ptr[x];
+	}
+	
+private:
+	int* ptr;
+	short len;
+
+};
+
+class B : public A {
+public:
+	B(short m, short k, double y) : A{m, k}, p{y} {}
+	double const f() {
+		int sum{};
+		for(int i = 0; i < getLen(); ++i) {
+			int t = get(i);
+
+			if((t%2) == 0) {
+				sum+=t;
+			}
+		}
+
+		if(sum == 0)
+			return 0;
+
+		return static_cast<double>(sum/p);
+	}
+
+	void print(ostream& os) {
+		A::print(os);
+		os << ", p=" << p;
+	}
+private:
+	double p;
+};
+
+class C : public A {
+public:
+	C(short n, short k, char c) : A{n, k}, x{c} {}
+
+	double const f() {
+		int sum{};
+		short c{};
+		for(int i = 0; i < getLen(); ++i) {
+			int t = get(i);
+
+			if((t%2) == 1) {
+				sum+=t;
+				++c;
+			}
+		}
+
+		if(c == 0)
+			return 0;
+
+		return static_cast<double>(sum/c);
+	}
+
+	string const g(char c) {
+		string t{""};
+		t+=x;
+		t+=c;
+
+		return t;
+	}
+
+	void print(ostream& os) {
+		A::print(os);
+		os << ", x=" << x;
+	}
+private:
+	char x;
+};
+
+ostream& operator<<(ostream& os, A& a) {
+	a.print(os);
+
+	return os;
+}
+
+int main() {
+	srand(111222333);
+    A *vett[DIM];
+
+	string conc{""};
+    for(int i=0; i<DIM; i++){
+		short n=1+rand()%10;
+		short m = 1+rand()%15;
+		if(rand()%2==0)
+	 	 	vett[i]= new B(n, m, rand()/(double) RAND_MAX+0.05);
+		else {
+	  		vett[i]= new C(n, m, (char) (rand()%('z' - 'a' + 1) + 'a'));
+			auto cpnt = dynamic_cast<C*>(vett[i]);
+			conc+=cpnt->g('h');
+		}
+	}
+
+	double sum{};
+    for(int i = 0; i < DIM; i++) {
+		auto fval = vett[i]->f();
+		cout << i << ") " << *(vett[i]) << ", f()=" << fval << endl; 
+		sum+=fval;
+	}
+	
+	cout << "PUNTO 2:\n\tavg(f())=" << sum/DIM << ", g('h')=" << conc << endl;
+	cout << "PUNTO 3:\n";
+	cout << (*(vett[0])).get(0) << endl;
+	(*(vett[0]))[0] = 24;
+	cout << (*(vett[0])).get(0) << endl;
+
+	
+	return 0;
+}