
The java.io package,which
contains classes to perform
input and output from vari-
ous data streams,including
files,is discussed in Chapter
11.
REFERENCE POINT
Omitting the priming read
leads to incorrect results.
COMMON ERROR
TRAP
Omitting the update read
may result in an endless
loop.
COMMON ERROR
TRAP
6.3 Event-Controlled Looping 287
A common error in constructing while loops is forgetting the update read.
Without the update read, the while loop continually processes the same
data item, leading to an endless loop.
Another common error is omitting the priming read and, instead, reading
data inside the while loop before the processing, as in the following
pseudocode: ...