Add dot product

vector.cpp

@@ -5,11 +5,23 @@ int main() {
 	vector v = vector(3);
 	cnumber one(1,0);
 	cnumber two(2,0);
+	cnumber three(3,0);
+	cnumber four(4,0);
+	cnumber five(5,0);
 	cnumber i(0,1);
 	v[0] = one;
 	v[1] = two;
 	v[2] = i;
 
+	vector w = vector(3);
+	w[0] = three;
+	w[1] = four;
+	w[2] = five;
+	cout << "v:" << endl;
 	cout << v << endl;
+	cout << "w:" << endl;
+	cout << w << endl;
+	cout << "v * w:" << endl;
+	cout << v * w << endl;
 	return 0;
 }

vector.hpp

@@ -92,4 +92,11 @@ public:
     }
     return product;
   }
+  const cnumber operator*(const vector &v) const {
+    cnumber res(0,0);
+    for (long long i = 0; i < this->get_dimention(); i++) {
+      res = res + this->get_entry(i) * v.get_entry(i);
+    }
+    return res;
+  }
 };