cobol-java-v3/benchmark-programs/30-keybreak-other/README.md

30-keybreak-other — Key Break Non-Summary Change Detector

电信业务场景

通话状态变化检测。对已排序的通话状态记录进行key切变化检测，当通话状态(待接听/通话中/已结束)发生变化时输出标记行。

Detects key changes without aggregation:

• Compare WS-PREV-KEY to detect key changes in sorted input
• On key change: write "*** KEY CHANGE TO: ***" marker line
• No aggregation — every data record is written to output unchanged
• First record always starts with a marker line

Files

File	Purpose
main-30-keybreak-other.cbl	COBOL program (fixed format)
data-gen.sh	Generate sorted test data (4 groups)
run.sh	Compile, run, display output

Input Record

Field	Type	Length
KEY	PIC X	10
DATA	PIC X	30

Output

Data records written as-is, with marker lines inserted before each new key group. Single-record groups produce a marker followed immediately by the data record.