Present in C++ pls

Write a program to ask the user to input the first letter of the day of the week (example: M or T etc). The program will then print the name of the day. The actual determination of the name of the week should take place inside a function called Day. If the user enters S then the program should also request for the second letter of the name. This should be done inside the function. Only pass the first letter into the function. The name of the day is printed from inside the function.