C++ project that lets the user to enter the stock price

Create a C++ project that lets the user to enter the stock price it closed for any number of days. Use a sentinel value you choose. If the sentinel value is the first you enter, give a message “NO stock was entered!”. Use a counter to keep the number of the stock price entries and an accumulator for the total of all entries. 

When the user finishes entering the prices, calculate the average and display it on the screen