1. Procedures

2. Differences between Dynamic and Static Calls

3. What is a Procedure?

4. Differences Between Procedures and Sub-routines
Sub-routines must be local to the program
Sub-routines use global variables
Sub-procedures can be recursive

5. Procedure Prototype and Program Interface
Every program has one
Coded as part of the Definition Specs
D Name ETDS Functions
D Main PR EXTPGM(‘XXX’)
D Main PI

6. Procedure Prototype
The calling program must have prototypes for each procedure that it calls.
Prototypes include as list of the variables that are passed to the procedure

7. Coding a Procedure Start/end with a P-Spec Paddproc B Daddproc PI
Dnewnum S 0
/free
newnum += 1;
/end-free
P E

8. Passing Parameters by Value
Must include the VALUE keyword in the procedure prototype and procedure interface
The prototype
Dcelsius PR
D Value
The procedure interface
D PI
Dfahrenheit Value

9. TEST(DE)
Tests dates
TEST(DE) dateformat datestring

10. %date() Converts a character string to a date field
new_date = %date(charString: dateformat)