diff --git a/ch2/01.cpp b/ch02/01.cpp
similarity index 100%
rename from ch2/01.cpp
rename to ch02/01.cpp
diff --git a/ch2/02.cpp b/ch02/02.cpp
similarity index 100%
rename from ch2/02.cpp
rename to ch02/02.cpp
diff --git a/ch2/03.cpp b/ch02/03.cpp
similarity index 100%
rename from ch2/03.cpp
rename to ch02/03.cpp
diff --git a/ch2/04.cpp b/ch02/04.cpp
similarity index 100%
rename from ch2/04.cpp
rename to ch02/04.cpp
diff --git a/ch2/05.cpp b/ch02/05.cpp
similarity index 100%
rename from ch2/05.cpp
rename to ch02/05.cpp
diff --git a/ch2/06.cpp b/ch02/06.cpp
similarity index 100%
rename from ch2/06.cpp
rename to ch02/06.cpp
diff --git a/ch2/07.cpp b/ch02/07.cpp
similarity index 100%
rename from ch2/07.cpp
rename to ch02/07.cpp
diff --git a/ch3/01.cpp b/ch03/01.cpp
similarity index 100%
rename from ch3/01.cpp
rename to ch03/01.cpp
diff --git a/ch3/02.cpp b/ch03/02.cpp
similarity index 100%
rename from ch3/02.cpp
rename to ch03/02.cpp
diff --git a/ch3/03.cpp b/ch03/03.cpp
similarity index 100%
rename from ch3/03.cpp
rename to ch03/03.cpp
diff --git a/ch3/04.cpp b/ch03/04.cpp
similarity index 100%
rename from ch3/04.cpp
rename to ch03/04.cpp
diff --git a/ch3/05.cpp b/ch03/05.cpp
similarity index 100%
rename from ch3/05.cpp
rename to ch03/05.cpp
diff --git a/ch3/06.cpp b/ch03/06.cpp
similarity index 100%
rename from ch3/06.cpp
rename to ch03/06.cpp
diff --git a/ch3/07.cpp b/ch03/07.cpp
similarity index 100%
rename from ch3/07.cpp
rename to ch03/07.cpp