a$.$ Write a $C++$ statement that includes the header flle iostream

c$.$ Write $C++$ statement$($s$)$ that declare the following varlables: num $1,$ num $2,$ num$3,$ and ave eagit$=$ of type int.

d$.$ Write $C++$ statements that store $125$ into num, $2$ into rum $2$ and $-25$ into num $3$ :

e$.$ Write a $C++$ statement that stores the average of nu$=1,$ num $2,$ and num into avercage

f$.$ Write $C+,$ statement$($s$)$ that output the values of num $2,$ num $2,$ num $3,$ and aver $3q$ e

g$.$ Compile and run your program.

$4.$ Repeat Programming Exercise $3$ by declaring num$1,$ num$2,$ and num$3,$ and average of type doubi$-$