Compilare: user.cpp: In function 'void df(int, int)': user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:81: warning: unused variable 'a' user.cpp:81: warning: unused variable 'b' user.cpp:81: warning: unused variable 'x' /tmp/cc58sWA3.o: In function `parse_c()': user.cpp:(.text+0x161): warning: the `gets' function is dangerous and should not be used.