Compilare: user.cpp: In function 'int eval(int, int)': user.cpp:13: warning: unused variable 'rez' user.cpp: In function 'int main()': user.cpp:39: warning: comparison between signed and unsigned integer expressions user.cpp:49: warning: comparison between signed and unsigned integer expressions /tmp/ccH1guyB.o: In function `main': user.cpp:(.text+0x63b): warning: the `gets' function is dangerous and should not be used.