Modify sec 4 and 5.

sec4.md

@@ -23,7 +23,7 @@ See a sample program `tfv1.c` below.
     12 "It is a japanese word that means a man whose work is making bamboo baskets.\n"
     13 "One day, he went into a mountain and found a shining bamboo."
     14 "\"What a mysterious bamboo it is!,\" he said."
-    15 "He cuts it, then there was a small cute baby girl in it."
+    15 "He cut it, then there was a small cute baby girl in it."
     16 "The girl was shining faintly."
     17 "He thought this baby girl is a gift from Heaven and took her home.\n"
     18 "His wife was surprized at his tale."
@@ -76,7 +76,7 @@ You can add or delete any character on GtkTextview.
 And your change is kept in GtkTextBuffer.
 If you add more characters than the limit of the window, the height of the window extends.
 If the height gets bigger than the height of the display screen, you won't be able to control the size of the window back to the original size.
-It's a problem.
+It's a problem and it shows that there exists a bug in the program.
 You can solve it by putting GtkScrolledWindow between GtkApplicationWindow and GtkTextView.
 
 ### GtkScrolledWindow
@@ -84,12 +84,12 @@ You can solve it by putting GtkScrolledWindow between GtkApplicationWindow and G
 What we need to do is:
 
 - Generate GtkScrolledWindow and set it as a child of GtkApplicationWindow.
-- Set GtkTextVies as a child of GtkScrolledWindow.
+- Set GtkTextView as a child of GtkScrolledWindow.
 
 Modify `tfv1.c` and save it as `tfv2.c`.
 The difference between these two files is very little.
 
-    $ diff tfv1.c tfv2.c
+    $ cd tfv; diff tfv1.c tfv2.c
     5a6
     >   GtkWidget *scr;
     24a26,28
@@ -122,7 +122,7 @@ Though you can modify the source file by this diff output, It's good for you to
     13 "It is a japanese word that means a man whose work is making bamboo baskets.\n"
     14 "One day, he went into a mountain and found a shining bamboo."
     15 "\"What a mysterious bamboo it is!,\" he said."
-    16 "He cuts it, then there was a small cute baby girl in it."
+    16 "He cut it, then there was a small cute baby girl in it."
     17 "The girl was shining faintly."
     18 "He thought this baby girl is a gift from Heaven and took her home.\n"
     19 "His wife was surprized at his tale."

sec5.md

@@ -127,7 +127,7 @@ The program is as follows.
     37   } else {
     38     filename = g_file_get_path (files[0]);
     39     g_print ("No such file: %s.\n", filename);
-    40     gtk_window_destroy (GTK_WINDOW (win));    
+    40     gtk_window_destroy (GTK_WINDOW (win));
     41   }
     42 }
     43 

src/sec4.src.md

@@ -8,7 +8,7 @@ GtkTextview is a widget for multiline text editing.
 GtkTextBuffer is a text buffer which is connected to GtkTextView.
 See a sample program `tfv1.c` below.
 
-@@@ tfv1.c
+@@@ tfv/tfv1.c
 
 Look at line 25.
 GtkTextView is generated and its pointer is assigned to `tv`.
@@ -30,7 +30,7 @@ You can add or delete any character on GtkTextview.
 And your change is kept in GtkTextBuffer.
 If you add more characters than the limit of the window, the height of the window extends.
 If the height gets bigger than the height of the display screen, you won't be able to control the size of the window back to the original size.
-It's a problem.
+It's a problem and it shows that there exists a bug in the program.
 You can solve it by putting GtkScrolledWindow between GtkApplicationWindow and GtkTextView.
 
 ### GtkScrolledWindow
@@ -38,18 +38,18 @@ You can solve it by putting GtkScrolledWindow between GtkApplicationWindow and G
 What we need to do is:
 
 - Generate GtkScrolledWindow and set it as a child of GtkApplicationWindow.
-- Set GtkTextVies as a child of GtkScrolledWindow.
+- Set GtkTextView as a child of GtkScrolledWindow.
 
 Modify `tfv1.c` and save it as `tfv2.c`.
 The difference between these two files is very little.
 
 $$$
-diff tfv1.c tfv2.c
+cd tfv; diff tfv1.c tfv2.c
 $$$
 
 Though you can modify the source file by this diff output, It's good for you to show `tfv2.c`.
 
-@@@ tfv2.c
+@@@ tfv/tfv2.c
 
 Now compile and run it.
 This time the window doesn't extend even if you type a lot of characters.

src/sec5.src.md

@@ -87,7 +87,7 @@ It works as follows.
 
 The program is as follows.
 
-@@@ tfv3.c
+@@@ tfv/tfv3.c
 
 Save it as `tfv3.c`.
 Then compile and run it.
@@ -154,7 +154,7 @@ It is shown in the right screenshot.
 GtkNotebook widget is between GtkApplicationWindow and GtkScrolledWindow.
 Now I want to show you the program `tfv4.c`.
 
-@@@ tfv4.c
+@@@ tfv/tfv4.c
 
 Most of the change is in the function `on_open`.
 The numbers at the left of the following items are line numbers in the source code.

src/tfv/comp

@@ -0,0 +1 @@
+gcc `pkg-config --cflags gtk4` $1.c `pkg-config --libs gtk4`

src/tfv/tfv1.c

@@ -12,7 +12,7 @@ on_activate (GApplication *app, gpointer user_data) {
 "It is a japanese word that means a man whose work is making bamboo baskets.\n"
 "One day, he went into a mountain and found a shining bamboo."
 "\"What a mysterious bamboo it is!,\" he said."
-"He cuts it, then there was a small cute baby girl in it."
+"He cut it, then there was a small cute baby girl in it."
 "The girl was shining faintly."
 "He thought this baby girl is a gift from Heaven and took her home.\n"
 "His wife was surprized at his tale."

src/tfv/tfv2.c

@@ -13,7 +13,7 @@ on_activate (GApplication *app, gpointer user_data) {
 "It is a japanese word that means a man whose work is making bamboo baskets.\n"
 "One day, he went into a mountain and found a shining bamboo."
 "\"What a mysterious bamboo it is!,\" he said."
-"He cuts it, then there was a small cute baby girl in it."
+"He cut it, then there was a small cute baby girl in it."
 "The girl was shining faintly."
 "He thought this baby girl is a gift from Heaven and took her home.\n"
 "His wife was surprized at his tale."

src/tfv/tfv3.c

@@ -37,7 +37,7 @@ on_open (GApplication *app, GFile ** files, gint n_files, gchar *hint, gpointer
   } else {
     filename = g_file_get_path (files[0]);
     g_print ("No such file: %s.\n", filename);
-    gtk_window_destroy (GTK_WINDOW (win));    
+    gtk_window_destroy (GTK_WINDOW (win));
   }
 }