Write a C

$+$

$+$

$$program to concatenate two strings

$($

John and Doe

$)$

$$entered by the user

a

$.$

$$Using cin and cout, prompt the user for and read in first name

$($

John

$)$

$.$

b

$.$

$$Using cin and cout, prompt the user for and read in last name

$($

Doe

$)$

$.$

c

$.$

$$Concatenate two strings using

$+$

$$operator$.$

d

$.$

$$Determine the length of the concatenated string using length

$($

$)$

$$function