The processing steps can now be added to the defining diagram as
follows:
INPUT
Pence-amount
PROCESSING
Read purchase amount
Calculate change from £1.00
Calculate set of change
Print set of change
OUTPUT
Set-of-change
The four steps listed in the defining diagram are sufficient to
establish the requirements of the problem. The programmer must be
absolutely confident of
what
is to be done in the program, before he or
she can attempt to establish
how.
3.2
Designing
a
solution algorithm
Designing a solution algorithm is the most challenging task in the life
cycle of a program. Once the program has been properly defined
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