Suppose the function f ($($x)$)$ is defined as the following, x +4,$+4,$ if x <0,$<0,$f ($($x)=$)=$ x4+4,$4+4,$ if x 0.$0.$Write a C++$++$ program to calculate the value f ($($u)+$)+$ f ($($v)+$)+$ f u+$+$v 2$2$if the values u and v aregiven as user inputs. Your program must contain one function to calculate the value f ($($x)$)$ for any value of x.$.$