I pay 20 euro! 29.44 US$ for a conversion

[Luca Lupo]

file main.cpp: 40 lines
file observer.cpp: 47 lines
file observer.h: 50 lines
file subjcet.cpp: 95 lines
file subjcet.h: 35 lines
file post.cpp: 32 lines
file post.h: 16 lines

is all very simple