Translate the following physics formula into C++ code: p=fD2Dpv2 \[ \begin{array}{l} \text { delta_p }=f_{-} D * r h o * v * v / 2 * D ; \\ \text { delta_p }=1 / 2 * r h o * f_{-} D * v^{\wedge} 2 / D ; \\ \text { delta_p }=f_{-} D * 1 / 2 * r h o * v * v / D ; \\ \text { delta_p }=f_{-} D 1 / 2 \text { rho } v^{\wedge} 2 / D ; \\ \text { delta_p }=f_{-} D^{*} r h o / 2 * v * v / D \end{array} \]