Compilare: user.cpp: In function ‘int cupleaza(int)’: user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp:23: warning: name lookup of ‘i’ changed user.cpp:8: warning: matches this ‘i’ under ISO standard rules user.cpp:16: warning: matches this ‘i’ under old rules user.cpp:23: warning: comparison between signed and unsigned integer expressions