Compilare: user.cpp: In function 'void lee(int, int)': user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:77: warning: comparison between signed and unsigned integer expressions user.cpp:88: warning: comparison between signed and unsigned integer expressions user.cpp:102: warning: comparison between signed and unsigned integer expressions user.cpp:124: warning: comparison between signed and unsigned integer expressions