Compilare: user.cpp: In function ‘int termen()’: user.cpp:105:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[j]>='a'&&s[j]<='z') r=val[s[j]]; ^ user.cpp:99:5: warning: ‘r’ is used uninitialized in this function [-Wuninitialized] if(r=='(') ^ user.cpp:105:40: warning: array subscript is above array bounds [-Warray-bounds] if(s[j]>='a'&&s[j]<='z') r=val[s[j]]; ^