In this chapter, the class dateType was designed to implement the date
in a program, but the member function setDate and the constructor do not
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Programming Exercises | 739
check whether the date is valid before storing the date in the member
variables. Rewrite the definitions of the function setDate and the constructor
so that the values for the month, day, and year are checked before
storing the date into the member variables. Add a member function,
isLeapYear, to check whether a year is a leap year. Moreover, write a
test program to test your class