Atari XL

CHAPTER 8
FUNCTIONS
A 'function' in computing is an instruction which
performs a calculation on a number. There are a
number of functions available on the Atari XL. For
example, in Chapter 7 functions were described
which operate on numbers to give strings, or on
strings to give numbers. In this chapter we will
look at some more of the functions available on the
Atari.
SQUARE ROOTS
The square root of a number is calculated by the
function SQR(N). The square root of a number or
variable N is the number which when multiplied
by itself, or squared, gives N. Try:
PRINT SQR(4)
The Atari displays 2, because 2 squared (2*2) is 4.
10 FOR N = 1 TO 10
20 PRINT N, SQR(N)
30 NEXT N
prints the numbers 1 to 10 and their square roots.
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