Q1:  The output of the Interest program looks sloppy. How do I control how many digits are displayed? 
A1:
 The easiest way to control the number of decimal digits is to use the printf function, which is covered in Hour 9, "More Functions and Operators." 
Q2:  Does Perl have a function for rounding? 
A2:
 The printf function usually does what you want for rounding when displaying numbers. If you really need the round function, check out the POSIX module, which has this function and many more. 
Q3:  How large (or small) of a number will Perl let me manipulate? 
A3:


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