Create a program that will use pointers to determine the average $($to $1$ decimal place$)$ of a series of grades entered into an array. You can assume a maximum of $15$ students and the user will end input with a sentinel value. Make sure to use pointer increment and a pointer comparison while loop, and not array notation or array index numbers or offsets.

You will use a function called getgrades. Send the array name $($a pointer constant$)$ to the function and accept it as a pointer variable $($you can now use the pointer to increment through the array $-$ without having to move over index number spots$).$