This is the question $2($a$)$ Define function prototype in C$++.$

$($b$)$ Define function definition in C$++.$

$($c$)$ Define function call in C$++.$

$($d$)$ Why is it advantageous to use functions in C$++?$Use the same problem you created in Question $2,$ but this time use C$++$ program with functions to solve it$.$ Demonstrate how you can use function in this case.