Compilare: user.cpp: In function ‘int decode(int, char&, char&)’: user.cpp:43:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void read()’: user.cpp:59:13: warning: unused variable ‘pz’ [-Wunused-variable] int pz = code(c,d); ^ user.cpp: In function ‘void reconst()’: user.cpp:158:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < word.size(); ++i) ^