Fix strcmp and stub everything

Author: Kimmo

QtExercise1/test_runner/test_runner.cpp

@@ -47,6 +47,6 @@ void test_runner::hello_still_worlds() {
     useful test_useful;
 
     POINT(hello_still_worlds, 5);
-    QVERIFY2(!strcmp(test_useful.hello(), "Hello, world!", "world"));
+    QVERIFY2(!strcmp(test_useful.hello(), "Hello, world!"), "world");
 
 }

QtExercise2/src/useful.cpp

@@ -7,5 +7,8 @@ useful::~useful()
 
 void useful::hello(QString helloText)
 {
+    // BEGIN SOLUTION
     emit usefulSignal(helloText);
+    // END SOLUTION
+    // Write emit code here
 }

QtExercise3/src/useful.cpp

@@ -5,5 +5,8 @@ useful::useful() {
 }
 
 int useful::mul(int i1, int i2) {
+    // BEGIN SOLUTION
     return i1 * i2;
+    // END SOLUTION
+    // STUB: return 0; // write code here
 }