MPE CI Programming for 7.0

July 22, 2008
Page 19
hp e3000
strategy
file i/o
• three main alternatives:
• write to (create) and read from a MSG file via I/O redirection
• use :PRINT and I/O redirection to read file 1 record at a time
• use entry points and I/O redirection
• why not use INPUT in WHILE to read a flat file, e.g.:
• while not eof do
input varname < filename
…
endwhile
• MSG file works because each read is destructive, so next INPUT reads
next record