Compilare: user.cpp: In function ‘void Read()’: user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Write()’: user.cpp:95: warning: comparison between signed and unsigned integer expressions user.cpp:97: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:122: warning: comparison between signed and unsigned integer expressions user.cpp:123: warning: comparison between signed and unsigned integer expressions user.cpp:130: warning: comparison between signed and unsigned integer expressions user.cpp:133: warning: comparison between signed and unsigned integer expressions user.cpp:137: warning: comparison between signed and unsigned integer expressions user.cpp:154: warning: comparison between signed and unsigned integer expressions