chore: lab exam 28/2/19

1 files changed, 162 insertions, 0 deletions

diff --git a/I_anno/Programmazione_1/lab_28_02_19.cc b/I_anno/Programmazione_1/lab_28_02_19.cc
new file mode 100644
index 0000000..4639f66
--- /dev/null
+++ b/I_anno/Programmazione_1/lab_28_02_19.cc
@@ -0,0 +1,162 @@
+#include<iostream>
+#include<cstdlib>
+#include<cmath>
+#define DIM 50
+using namespace std;
+
+class A {
+public:
+	A(short m, char c) : len{m} {
+		ptr = new char[len];
+		srand(time(NULL));
+		for(int i = 0; i < m; ++i) {
+			ptr[i] = static_cast<char>(rand()%(c-'a'+1) + 'a');
+		}
+	}
+	A(const A& a) = default;
+	~A() {
+		delete ptr;
+	}
+
+	virtual string elab(short a, char c) = 0;
+	virtual void print(ostream& o) = 0;
+	short getLen() {
+		return len;
+	}
+
+	char& operator[](int i) {
+		return ptr[i];
+	}
+
+protected:
+	char get(short i) {
+		if(i > len)
+			return ptr[0];
+
+		return ptr[i];
+	}
+
+private:
+	char* ptr;
+	short len;
+};
+
+class B : public A {
+public:
+	B(short m, double y, char c) : A{m, c}, x{y} {}
+	double foo(short s) {
+		return sin(x+s)/log(x+s);
+	}
+
+	string elab(short a, char c) {
+		string st{};
+		for(int i = 0; i < getLen(); ++i) {
+			auto ch = get(i);
+			if(abs(ch-c) <= a) {
+				st+=ch;
+			}
+		}
+
+		return st;
+	}
+
+	void print(ostream& os) {
+		os << "B ptr=[";
+		for(int i = 0; i < getLen(); ++i) 
+			os << get(i) << ' ';
+
+		os << "], x=" << x << ", elab(5, z)=" << elab(5, 'z');
+	}
+
+private:
+	double x;
+};
+
+template<typename T>
+class C : public A {
+public:
+	C(short n, double k, char c) : A{n, c} {
+		if(typeid(T) == typeid(short))
+			y = static_cast<int>(100*k);
+		else
+			y = k;
+	}
+
+	string elab(short a, char c) {
+		string st{};
+		if(getLen() >= a) {
+			if(a >= 1) {
+				for(int i = 0; i < getLen(); st+=c, ++i);
+			}
+		} else {
+			for(int i = 0; i < getLen(); st += get(i++));
+		}
+
+		return st;
+	}
+
+	double g(short w) {
+		return sin(w+y);
+	}
+	
+	void print(ostream& os) {
+		os << "C<" << typeid(T).name() << "> ptr=[";
+		for(int i = 0; i < getLen(); ++i) 
+			os << get(i) << ' ';
+
+		os << "], y=" << y << ", elab(5, z)=" << elab(5, 'z');
+	}
+private:
+	T y;
+};
+
+ostream& operator<<(ostream& os, A& a) {
+	a.print(os);
+
+	return os;
+}
+
+int main() {
+	srand(time(NULL));
+
+	A *vett[DIM];
+	short cb{}, cc{};
+	double sumb{}, sumc{};
+
+	for(int i=0; i<DIM; i++) {
+  		short n=1+rand()%10;
+    	switch(rand()%3) {
+      	case 0: 
+		{
+        	vett[i]= new B(n, (double) rand()/RAND_MAX, rand()%('z' - 'a' + 1) + 'a');
+			auto temp = dynamic_cast<B&>(*(vett[i]));
+			sumb+=temp.foo(5);
+			++cb;
+			break;
+      	}
+		case 1:
+			vett[i]= new C<double>(n, (double) rand()/RAND_MAX, rand()%('z' - 'a' + 1) + 'a');
+			break;
+      	case 2:
+		{
+			vett[i]= new C<short>(n, (double) rand()/RAND_MAX, rand()%('z' - 'a' + 1) + 'a');
+			auto temp = dynamic_cast<C<short>&>(*(vett[i]));
+			sumc+=temp.g(5);
+			++cc;
+		}
+      	}
+	}
+
+	for(int i=0; i<DIM; i++) {
+		cout << *vett[i] << endl;
+	}
+
+	cout << "avg(foo(5))=" << sumb/cb << " "; 
+	cout << "avg(g(5))=" << sumc/cc << endl; 
+
+	cout << endl;
+	cout << *vett[0] << endl;
+	(*vett[0])[0] = '$';
+	cout << *vett[0] << endl;
+	return 0;
+}