Compilare: user.cpp: In function ‘int main()’: user.cpp:112: warning: comparison between signed and unsigned integer expressions user.cpp:139: warning: comparison between signed and unsigned integer expressions user.cpp:144: warning: comparison between signed and unsigned integer expressions user.cpp:147: warning: comparison between signed and unsigned integer expressions user.cpp:152: warning: comparison between signed and unsigned integer expressions user.cpp:162: warning: comparison between signed and unsigned integer expressions user.cpp:70: warning: unused variable ‘rad’