From d7e54927ac774b0fdb7d5b87f05738c600b2c0fe Mon Sep 17 00:00:00 2001
From: Santo Cariotti <dcariotti24@gmail.com>
Date: Sat, 1 Feb 2020 11:51:56 +0100
Subject: chore: lab exam A 28/2/19

---
 I_anno/Programmazione_1/lab_28_02_19_A.cc | 166 ++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 I_anno/Programmazione_1/lab_28_02_19_A.cc

diff --git a/I_anno/Programmazione_1/lab_28_02_19_A.cc b/I_anno/Programmazione_1/lab_28_02_19_A.cc
new file mode 100644
index 0000000..ff2eaae
--- /dev/null
+++ b/I_anno/Programmazione_1/lab_28_02_19_A.cc
@@ -0,0 +1,166 @@
+#include<iostream>
+#include<stdexcept>
+#include<cstdlib>
+#include<cmath>
+#define DIM 50
+
+using namespace std;
+
+class A {
+public:
+	A(short m) : len{m} {
+		arr = new short[m];
+		srand(time(NULL));
+		for(int i = 0; i < m; ++i) {
+			arr[i] = rand()%10+1;
+		}
+	}
+
+	~A() {
+		delete[] arr;
+	}
+
+	virtual double f(short a) = 0;	
+	virtual void print(ostream& os) = 0;
+
+	short getLen() {
+		return len;
+	}
+
+protected:
+	short get(short i) {
+		if(i < 0 || i >= getLen())
+			throw out_of_range{"out of arr' range"};
+
+		return arr[i];
+	}
+
+private:
+	short* arr;
+	short len;
+};
+
+template<typename T>
+class B : public A {
+public:
+	B(short m, char c) : A{m} {
+		if(typeid(T) == typeid(char)) {
+			x = c;
+		} else if(typeid(T) == typeid(string)) {
+			for(int i = 0; i < m; ++i) 
+				x+=c;
+
+		} else {
+			// tipo non gestito
+			throw bad_typeid{}; 
+		}
+	}
+	
+	double f(short a) override {
+		double n = static_cast<double>(getLen() - a);
+		double sum{};
+		for(int i = a; i < getLen(); ++i) 
+			sum+=get(i);
+		
+		return sum/n;
+	}
+
+	void print(ostream& os) override {
+		os << "B<" << (typeid(T) == typeid(char) ? "char" : "string") << "> arr=[";
+		for(int i = 0; i < getLen(); ++i)
+			os << get(i) << ' ';
+		os << "], x=" << x;
+	}
+
+	double foo(short s) {
+		return log(s) + sin(f(s));
+	}
+private:
+	T x;
+};
+
+class C : public A {
+public:
+	C(short n, int k) : A{n}, y{k} {}
+
+	double f(short a) override {
+		srand(time(NULL));
+		short rand_elem = get(rand()%getLen());
+		
+		return static_cast<double>(a+y)/static_cast<double>(rand_elem);
+	}
+
+	double g(short w) {
+		// sicuri che non debba convertire a double? qui sarà sempre 0, forse 1
+		return static_cast<double>(sin(w+y));
+	}
+
+	void print(ostream& os) override {
+		os << "C arr=[";
+		for(int i = 0; i < getLen(); ++i)
+			os << get(i) << ' ';
+		os << "], y=" << y;
+	}
+
+	C& operator++() {
+		++y;
+		return *this;
+	}
+private:
+	int y;
+};
+
+ostream& operator<<(ostream& os, A& a) {
+	a.print(os);
+
+	return os;
+} 
+
+int main() {
+	srand(111222333);
+
+	A *vett[DIM];
+
+	double max_f3{-100000000.0};
+	short c_count{};
+	double gsum{};
+	short i_to_p{-1};
+	
+	for(int i=0; i<DIM; i++) {
+		short n=1+rand()%10;
+		switch(rand()%3) {
+		case 0: 
+		{
+			vett[i]= new C(n, rand()%10 + 1);
+			i_to_p = i;
+			auto cref = dynamic_cast<C&>(*(vett[i]));
+			gsum+=cref.g(5);
+			++c_count;
+	    	break;
+	  	}
+		case 1:
+	    	vett[i]= new B<string>(n, rand()%('z' - 'a' + 1) + 'a');
+	    	break;
+	  	case 2: 
+	    	vett[i]= new B<char>(n, rand()%('z' - 'a' + 1) + 'a');
+		}
+
+		auto f3 = vett[i]->f(3);
+		if(f3 > max_f3)
+			max_f3 = f3;
+    }
+
+	for(int i = 0; i < DIM; ++i)
+		cout << i+1 << ')' << *(vett[i]) << ", f(3)=" << vett[i]->f(3) << endl;
+
+	cout << "max f(3)=" << max_f3;
+	cout << " avg g(5)=" << (static_cast<double>(gsum/c_count)) << endl;
+	if(i_to_p >= 0) {
+		cout << *(vett[i_to_p]) << endl;
+		auto cref = dynamic_cast<C*>(vett[i_to_p]);
+		++(*cref);
+		cout << *(vett[i_to_p]) << endl;
+	}
+	
+	return 0;
+}
-- 
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