Added/tweaked comments and blank lines in demo programs of all language versions except JavaScript.

cpp/QrCodeGeneratorDemo.cpp

@@ -46,7 +46,6 @@ static void doMaskDemo();
 static void printQr(const QrCode &qr);
 
 
-
 // The main application program.
 int main() {
 	doBasicDemo();
@@ -57,6 +56,9 @@ int main() {
 }
 
 
+
+/*---- Demo suite ----*/
+
 // Creates a single QR Code, then prints it to the console.
 static void doBasicDemo() {
 	const char *text = "Hello, world!";  // User-supplied text
@@ -181,6 +183,9 @@ static void doMaskDemo() {
 }
 
 
+
+/*---- Utilities ----*/
+
 // Prints the given QR Code to the console.
 static void printQr(const QrCode &qr) {
 	int border = 4;