Compilare: user.cpp: In function ‘bool termen()’: user.cpp:50:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] return val[ expr[ point - 1 ] ]; ^ user.cpp: In function ‘int main()’: user.cpp:95:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] val[ c ] ^= 1; ^ user.cpp: In function ‘bool termen()’: user.cpp:52:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ /tmp/ccMNWXZJ.o: In function `main': user.cpp:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.