Using devC$++$ compiler;Book Club Points

Serendipity Booksellers has a book club that awards points to its customers based on

the number of books purchased each month. The points are awarded as follows:

If a customer purchases $0$ books, he or she earns $0$ points.

If a customer purchases $1$ book, he or she earns $5$ points.

If a customer purchases $2$ books, he or she earns $15$ points.

If a customer purchases $3$ books, he or she earns $30$ points.

If a customer purchases $4$ or more books, he or she earns $60$ points.

Write a program that asks the user to enter the number of books he or she has pur$-$

chased this month then displays the number of points awarded.