Fast Track 2.3 - Revision history

Laura: /* Reading a data file, and then using that information to print */

2015-02-02T21:45:27Z

Reading a data file, and then using that information to print

← Older revision		Revision as of 21:45, 2 February 2015
Line 15:		Line 15:
	Later, if we want to print out the list of names and email addresses (or use them to send out statements!) we open the file again.		Later, if we want to print out the list of names and email addresses (or use them to send out statements!) we open the file again.

	OPEN #EMAIL_FILE: “Name=customerlist, recl=58”: INTERNAL, INPUT ERROR errorhandling		OPEN #EMAIL_FILE: “Name=customerlist, recl=58”, INTERNAL, INPUT ERROR errorhandling

	Reading and making changes to that information using GRID and LIST		Reading and making changes to that information using GRID and LIST

Laura: /* Closing a data file */

2014-09-10T18:38:48Z

Closing a data file

← Older revision		Revision as of 18:38, 10 September 2014
Line 9:		Line 9:
	Closing a file is the easiest step:		Closing a file is the easiest step:

	CLOSE #3:		CLOSE #3:

	Reading a data file, and then using that information to print		====Reading a data file, and then using that information to print====

	Later, if we want to print out the list of names and email addresses (or use them to send out statements!) we open the file again.		Later, if we want to print out the list of names and email addresses (or use them to send out statements!) we open the file again.

Laura: Created page with "====Writing to a data file==== WRITE #3, USING “N 8, C 50”: cusnum, email$ Writes the customer number and email to file #3, which we just opened. (File numbers can be ..."

2014-08-05T21:20:41Z

Created page with "====Writing to a data file==== WRITE #3, USING “N 8, C 50”: cusnum, email$ Writes the customer number and email to file #3, which we just opened. (File numbers can be ..."

New page

====Writing to a data file====

WRITE #3, USING “N 8, C 50”: cusnum, email$

Writes the customer number and email to file #3, which we just opened. (File numbers can be replaced with labels to make your programs clearer). The N 8 means that the cusnum variable can be up to 8 digits long, while the C 50 means that the email$ variable can be up to 50 characters. These form descriptions can be put into a FORM statement and referenced by a line label, as you'll see in the READ example coming up.

====Closing a data file====

Closing a file is the easiest step:

CLOSE #3:

Reading a data file, and then using that information to print

Later, if we want to print out the list of names and email addresses (or use them to send out statements!) we open the file again.

OPEN #EMAIL_FILE: “Name=customerlist, recl=58”: INTERNAL, INPUT ERROR errorhandling

Reading and making changes to that information using GRID and LIST

READ #EMAIL_FILE, USING “N 8, C 50”: cusnum, email$

This will read the first record in the file and store it under the variable names cusnum and email$. But this is a whole list and so we will have to repeat the READ command and store the information into MAT cusnum and MAT email$. Using a For Next statement.

Emailform: form N 8, C 50
While N=1
READ #EMAIL_FILE, USING emailform: cusnum, email$ EOF lastrecord
Loop
lastrecord: ! Read is done.

CLOSE #EMAIL_FILE:

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[[Category:Fast Track Tutorial]]
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