Compilare: user.cpp: In function 'int f1()': user.cpp:126: warning: array subscript has type 'char' user.cpp: In function 'int f2()': user.cpp:181: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:205: warning: comparison between signed and unsigned integer expressions user.cpp:217: warning: comparison between signed and unsigned integer expressions /tmp/cc1VGbMn.o: In function `main': user.cpp:(.text+0x384): warning: the `gets' function is dangerous and should not be used.