Compilare: user.cpp: In function ‘void afis_pct()’: user.cpp:88: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void rezolva()’: user.cpp:128: warning: comparison between signed and unsigned integer expressions user.cpp:130: warning: comparison between signed and unsigned integer expressions user.cpp:134: warning: comparison between signed and unsigned integer expressions user.cpp:135: warning: comparison between signed and unsigned integer expressions user.cpp:141: warning: comparison between signed and unsigned integer expressions