ch04
....\Ex04_05
....\.......\ex04_05.cpp
....\Ex04_06
....\.......\ex04_06.cpp
....\Ex04_08
....\.......\ex04_08.cpp
....\Ex04_12
....\.......\ex04_12.cpp
....\Ex04_18
....\.......\ex04_18.cpp
....\Ex04_21
....\.......\ex04_21.cpp
....\Ex04_22
....\.......\ex04_22.cpp
....\Ex04_24
....\.......\ex04_24.cpp
....\Fig04_08_10
....\...........\fig04_10.cpp
....\...........\GradeBook.cpp
....\...........\GradeBook.h
....\Fig04_12_14
....\...........\fig04_14.cpp
....\...........\GradeBook.cpp
....\...........\GradeBook.h
....\Fig04_16_18
....\...........\Analysis.cpp
....\...........\Analysis.h
....\...........\fig04_18.cpp
....\Fig04_21
....\........\fig04_21.cpp
....\Fig05_01
....\........\fig05_01.cpp
....\Fig05_06
....\........\fig05_06.cpp