diff --git a/04_UDEF/RationalNumber.cpp b/04_UDEF/RationalNumber.cpp
index fe25204..20f3631 100644
--- a/04_UDEF/RationalNumber.cpp
+++ b/04_UDEF/RationalNumber.cpp
@@ -2,7 +2,7 @@
 #include "RationalNumber.hpp"
 
 RationalNumber addRationalNumbers(RationalNumber left, RationalNumber right){
-	RationalNumber result;
+	RationalNumber result = left;
 	// add left and right
 	return result;
 }
diff --git a/04_UDEF/main_04_UDEF_a.cpp b/04_UDEF/main_04_UDEF_a.cpp
index fd50ced..ef2894e 100644
--- a/04_UDEF/main_04_UDEF_a.cpp
+++ b/04_UDEF/main_04_UDEF_a.cpp
@@ -13,7 +13,7 @@ typedef RationalNumber calctype;
 // location 2
 
 RationalNumber operator+(RationalNumber a, RationalNumber b) {
-
+	return a;
 }
 
 std::string as_string(RationalNumber rationalNumber) {
diff --git a/11_PUTT/02_Ment/LCDDisplay.cpp b/11_PUTT/02_Ment/LCDDisplay.cpp
index e3ab267..0442cfa 100644
--- a/11_PUTT/02_Ment/LCDDisplay.cpp
+++ b/11_PUTT/02_Ment/LCDDisplay.cpp
@@ -49,5 +49,6 @@ int main(){
     printf("F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF             \r\n");
     printf("RS=0                                                        \r\n");
     printf("02	/*Return Home*/                                         \r\n");
-    getchar();
+    //getchar();
+    return 0;
 }
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 95143dc..902741b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,14 +4,14 @@ project(test_build)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
 
 add_executable(UDEF_1 04_UDEF/main_04_UDEF_e.cpp)
-add_executable(UDEF_2 04_UDEF/main_04_UDEF_a.cpp)
+#add_executable(UDEF_2 04_UDEF/main_04_UDEF_a.cpp)
 add_executable(UDEF_Testat 04_UDEF/Testat/Testat.cpp)
 
 
 add_executable(OO_A 05_OO/main_mp4_OO_a_vehicles.cpp)
 #add_executable(OO_B 05_OO/main_mp4_OO_b.cpp)
 
-add_executable(OO_Shapes 05_OO/shapes_main.cpp)
+#add_executable(OO_Shapes 05_OO/shapes_main.cpp)
 
 add_executable(SequenceDiagram 11_PUTT/05_OO_b/SequenceDiagramCreator.cpp 11_PUTT/05_OO_b/main.cpp)