Compilare: user.cpp: In function ‘char pop()’: user.cpp:25:10: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] char x; ^ user.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int ParLis()’: user.cpp:71:25: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] else if(It->next->c==')'&&It->c=='('||It->next->c==']'&&It->c=='['){ ^