4 files changed, 101 insertions, 1 deletions
diff --git a/Polymorphism/MathExpression/Expression.hpp b/Polymorphism/MathExpression/Expression.hpp
index 4bcfe98..dd344d8 100644
--- a/Polymorphism/MathExpression/Expression.hpp
+++ b/Polymorphism/MathExpression/Expression.hpp
@@ -1 +1,14 @@
-d
+#include <iostream>
+
+class Expression
+{
+public:
+	virtual void Print() = 0;
+	virtual int Evaluate() = 0;
+	virtual ~Expression(){}
+	int getType(){ return type; }
+protected:
+	int type; //Ако обектът е NUM, ще пазим тук 1, а ако обектът е Операция, ще пазим тук 2.
+};
+
+
diff --git a/Polymorphism/MathExpression/Num.hpp b/Polymorphism/MathExpression/Num.hpp
new file mode 100644
index 0000000..d2da4ae
--- /dev/null
+++ b/Polymorphism/MathExpression/Num.hpp
@@ -0,0 +1,21 @@
+#include "Expression.hpp"
+class Num : public Expression
+{
+	int number;
+public:
+	Num(int number)
+	{
+		this->number = number;
+		type = 1;
+	}
+	void Print()
+	{
+		std::cout << number;
+	}
+	int Evaluate()
+	{
+		return number;
+	}
+	
+
+};
+\ No newline at end of file
diff --git a/Polymorphism/MathExpression/Operation.hpp b/Polymorphism/MathExpression/Operation.hpp
new file mode 100644
index 0000000..cfa9534
--- /dev/null
+++ b/Polymorphism/MathExpression/Operation.hpp
@@ -0,0 +1,46 @@
+class Operation : public Expression
+{
+
+public:
+	Expression* left;
+	char op;
+	Expression* right;
+	Operation(Expression* left, char ch, Expression* right)
+	{
+
+		this->left = left;
+		op = ch;
+		this->right = right;
+		type = 2;
+
+	}
+	void Print()
+	{
+		std::cout << '(';
+		left->Print();
+		std::cout << op;
+		right->Print();
+		std::cout << ')';
+	}
+	int Evaluate()
+	{
+		int result = left->Evaluate();
+		int value2 = right->Evaluate();
+
+		if (op == '+')
+			result += value2;
+		else if (op == '*')
+			result *= value2;
+		else
+			return 0; //Invalid operation
+		return result;
+	}
+	~Operation()
+	{
+
+		delete left;
+		delete right;
+		op = '\0';
+	}
+
+};
+\ No newline at end of file
diff --git a/Polymorphism/MathExpression/main.hpp b/Polymorphism/MathExpression/main.hpp
new file mode 100644
index 0000000..a309f44
--- /dev/null
+++ b/Polymorphism/MathExpression/main.hpp
@@ -0,0 +1,20 @@
+#include "Expression.hpp"
+int main()
+{
+	Expression* l = new Num(3);
+	Expression* r = new Num(7);
+	Expression* final1 = new Operation(l, '+', r);
+
+	Expression* l2 = new Num(3);
+	Expression* r2 = new Num(7);
+	Expression* final2 = new Operation(l2, '+', r2);
+
+	std::cout << final1->Evaluate();
+	
+	std::cout << AreTheSame(final1, final2);
+
+	delete final1, final2; //Винаги трием най-големите 'Expression-и'. Те се грижат за по-малките от които са образувани.
+
+	
+
+}
+\ No newline at end of file