C$++.$ Use while$()$ loop.

Admission ticket to the theater is $$13\mathrm{.}69.$

There are discounts as follows:

$$ Children under age $12$ will get $15\%$ discount $($age$<=12).$

$$ Seniors above age $60$ will get $20\%$ discount $($age $>=60).$

There is a cashback of $3\%$ regardless of ages.

Write a program that reads age until $0$ is entered, and calculates the

ticket price and cashback.