Compilare: user.cpp: In function 'int evalterm()': user.cpp:47: warning: array subscript has type 'char' user.cpp: In function 'int evalnot()': user.cpp:58: warning: unused variable 'val' user.cpp: In function 'void solve()': user.cpp:123: warning: array subscript has type 'char' user.cpp:123: warning: array subscript has type 'char' user.cpp: In function 'int evalterm()': user.cpp:25: warning: 'ret' may be used uninitialized in this function /tmp/ccswM8fN.o: In function `citire()': user.cpp:(.text+0x32e): warning: the `gets' function is dangerous and should not be used.