1. Display Files
Week 4

2. Write vs Exfmt Write displays the screen
Exfmt displays the screen and gets the input

3. Indicators Don’t need a data structure but…
Makes RPG more readable!
Data type for an indicator is an N
Fprjdspf CF E WORKSTN indds(indicators)
Dindicators DS
D F N
D F N
D F N

4. Date Field Functions

5. %diff - Finding the Difference between Dates
%DIFF(op1:op2:??)
Where ?? Can be:
*MSECONDS|*SECONDS|*MINUTES|*HOURS|*DAYS|*MONTHS|*YEARS Or
%DIFF(op1:op2:*MS|*S|*MN|*H|*D|*M|*Y)

6. Changing a number to a date value
%day(31) - will change 31 to a number of days
%month(9) – will change 9 to a number of months
%year(12) – will change 12 to a number of years
So:
newDate = oldDate + %day(15)
will add 15 days to oldDate and store the result in NewDate

7. Updating Database Files
Update record format name
changes a record.
The record must be read first
Write record format name
Appends a record to the file
Delete record format name
Deletes a record from the file
Record must be read first