Compilare: user.cpp: In function 'void computeNextInStack(std::stack<double, std::deque<double, std::allocator<double> > >&, std::stack<char, std::deque<char, std::allocator<char> > >&)': user.cpp:51: warning: statement has no effect user.cpp:56: warning: statement has no effect user.cpp:61: warning: statement has no effect user.cpp:67: warning: statement has no effect user.cpp: In function 'int main(int, char**)': user.cpp:194: warning: statement has no effect user.cpp:217: warning: statement has no effect