Compilare: user.cpp: In function 'int f1()': user.cpp:63: warning: array subscript has type 'char' user.cpp: In function 'int f2()': user.cpp:118: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:142: warning: comparison between signed and unsigned integer expressions user.cpp:154: warning: comparison between signed and unsigned integer expressions /tmp/ccEgvd0H.o: In function `main': user.cpp:(.text+0x1c4): warning: the `gets' function is dangerous and should not be used.