Compilare: user.cpp: In function 'void citire()': user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp:47: warning: comparison between signed and unsigned integer expressions user.cpp:47: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void afisare()': user.cpp:77: warning: format '%I64d' expects type 'int', but argument 3 has type 'long long unsigned int'