C$++$

$4.$ The pseudocode for SequentialSearch to find the index of a data $($V$)$ in an array A is given as below:

SequentialSearch$($A$,$ V$,$ N$)//$ N is number of data, V is the data searching for.

searchPos $0$

while searchPos $<=$ N$-1$

if V $=$ A$[$searchPos$]$

return searchPos

return $-1$

In the main, create an array and get user data for N and all the elements of array A$.$ Then call the SequentialSearch function and store the returned value in a variable index$\_$of$\_$V