Write a C$++$ statement that includes the header file iostream, and allows you to use cin, cout, and endl without the prefix std::$.$

Write C$++$ statements that declare the following variables: num$1,$ num$2,$ num$3,$ and average of type double.

Write C$++$ statements that store $75\mathrm{.}35$ into num$1,-35\mathrm{.}56$ into num$2,$ and $15\mathrm{.}76$ into num$3.$

Write a C$++$ statement that stores the average of num$1,$ num$2,$ and num$3$ as the variable average.

Write C$++$ statement$($s$)$ that output the values of num$1,$ num$2,$ num$3,$ and average.

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