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?