Compilare: user.cpp: In function ‘int main()’: user.cpp:71:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(st[i] <= 'Z' && st[i] >= 'A' || st[i] == '(' || st[i] == ')') ^ user.cpp: In function ‘int eval()’: user.cpp:16:9: warning: ‘res’ may be used uninitialized in this function [-Wmaybe-uninitialized] int res; ^