1. Designing and Writing Control-Break Programs
Chapter 10
Designing and Writing
Control-Break Programs

2. Types of Reports Detail or Transaction Reports Exception Reports
Include one or more lines of output for each input record read
Exception Reports
Printout of individual records that meet (or fail to meet) certain criteria
Summary Reports
Summarizes rather than itemizes to provide more comprehensive information

3. Topics Single-Level Control-Break Programs
Sequence of input records is important
Data is sorted on the control-break field
Multiple-level Control-Break Programs
Input data is sorted on two or more fields
Control-Break is Similar to Page Breaks

4. Control-Break Processing
The input data must be sorted
(Note: Chapter 13 covers detail of how your program can sort a file)
For now, we will assume the input file is already sorted (i.e., Sales Rep Number)
It could be sorted on two or three fields

6. Processing Logic Loop until EOF Print Ctrl-break Totals Read record
If First-Record Set the Saved-Ctrl-Nbr
If Ctrl-Nbr not equal Saved-Ctrl-Nbr
Print Ctrl-break totals
Reset Ctrl-break totals
Set the Saved-Ctrl-Nbr
Process record
Print Ctrl-break Totals

9. Processing Logic
When the “Next Record” does not match the Saved Control Number
Print the control-break total
Reset accumulators
Don’t forget about page break processing
Two types of Print Lines:
Detail Line
Control-break Total Line
At EOF, print last Control-break Total

10. Complex Programs Suppose there are two, or even three, control fields
The input file must be sorted on all fields (sorted in the proper sequence)
Sub-totals for each control-break

11. Complex Programs Input Data:
State, Branch, Sales Rep Number, other data
AR AR AR AR AR AR KY KY KY KY KY KY KY