using Coefficient $=$ double; class UnivariatePolynomial $\{$ public: UnivariatePolynomial$()=$ default; $//$ constructor from an initializer list of coefficients UnivariatePolynomial$($std::vector$)$; $//$ the degree of the polynomial; for simplicity, we will let the degree $//$ of the zero polynomial be $-1$ int degree$()$ const; $//$ change the symbol for the polynomial such as $\text{'}$y$\text{'}$ or $\text{'}$x$\text{'}$ void setSymbol$($char c$)$; $//$ get the symbol char symbol$()$ const;