Compilare: user.cpp: In function 'void citire()': user.cpp:7: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void parcurgere()': user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void afisare()': user.cpp:35: warning: comparison between signed and unsigned integer expressions