diff --git a/app/Main.hs b/app/Main.hs
index 351592f..959943c 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -8,8 +8,8 @@ developProgram :: String
 developProgram =
   -- "int i = 1; int j = 2; int l = 3 + 4; int k = i + j + l; k = k * 0;"
   -- "void test(int i, int k) { }"
-  -- "int main() { print(); }"
-  "print()"
+  -- "print()"
+  "int main() { print(); }"
 
 main :: IO ()
 main = do
diff --git a/src/Interpreter/BuiltIn.hs b/src/Interpreter/BuiltIn.hs
index 4290cab..a75a6b9 100644
--- a/src/Interpreter/BuiltIn.hs
+++ b/src/Interpreter/BuiltIn.hs
@@ -20,6 +20,6 @@ printBuiltIn =
     [CustomType "String"]
     UnitType
     ( \[CustomType "String"] -> do
-        putStrLn "Hello, World!"
+        putStrLn "Hello, World!\n"
         pure UnitType
     )
diff --git a/src/Interpreter/Interpreter.hs b/src/Interpreter/Interpreter.hs
index f06487c..9ad6f10 100644
--- a/src/Interpreter/Interpreter.hs
+++ b/src/Interpreter/Interpreter.hs
@@ -28,7 +28,9 @@ interpret (Program statements) = do
   where
     addMainFunctionCall = if hasMainFunction then mainFunctionCall else []
     mainFunctionCall = [ExpressionStatement (AtomicExpression (FunctionCallAtomic "main" []))]
-    hasMainFunction = False
+    hasMainFunction = Prelude.filter isMainFunction statements /= []
+    isMainFunction (FunctionDefinitionStatement (Function "main" _ _ _)) = True
+    isMainFunction _ = False
     isFunctionDefinition (FunctionDefinitionStatement _) = True
     isFunctionDefinition _ = False
     getFunctionName (FunctionDefinitionStatement (Function name _ _ _)) = name