diff --git a/cnumber.cpp b/cnumber.cpp
index 738e42e..86a78b9 100644
--- a/cnumber.cpp
+++ b/cnumber.cpp
@@ -3,7 +3,8 @@
 
 
 int main() {
-	cnumber z(1, -7);
+	cnumber a(-1, 4);
+	cnumber b(4, -7);
 
-	cout << z << endl;
+	cout << "a = " << a << " b = " <<  b << " a + b =  " << a + b << endl;
 }
diff --git a/cnumber.hpp b/cnumber.hpp
index 33ceb3b..90b2c54 100644
--- a/cnumber.hpp
+++ b/cnumber.hpp
@@ -18,9 +18,13 @@ class cnumber {
 			signi = get_sign(i);
 			
 		}
+		cnumber operator+(const cnumber& that) {
+			cnumber z(that.r + this->r, that.i + this->i);
+			return z;
+		}
 
 		friend ostream &operator<<( ostream &os, const cnumber &z ) { 
-			os << z.r << (z.signi ? '+' : '-') << 'i' << (z.signi ? z.i : z.i * -1); 
+			os << z.r << (z.signi ? '+' : '\0' ) <<  z.i << 'i'; 
 			return os;            
 		}