Give the function header for each of the following functions:

a$)$ Function hypotenuse that takes two double$-$precision, floating$-$point arguments, side$1$

and side$2,$ and returns a double$-$precision, floating$-$point result.

b$)$ Function smallest that takes three integers, x$,$ y and z$,$ and returns an integer.

c$)$ Function instructions that does not receive any arguments and does not return a val

ue$.[$Note: Such functions are commonly used to display instructions to a user.$]$

d$)$ Function intToDouble that takes an integer argument, number, and returns a double

precision, floating$-$point result.

Give the function prototype $($without parameter names$)$ for each of the following:

a$)$ The function described in Exercise$6\mathrm{.}4($a$).$

b$)$ The function described in Exercise$6\mathrm{.}4($b$).$

c$)$ The function described in Exercise$6\mathrm{.}4($c$).$

d$)$ The function described in Exercise$6\mathrm{.}4($d$).$