cobol-java-v3/benchmark-programs/07-keybreak-summary/README.md

07-keybreak-summary — Key Break Summary

电信业务场景

加入者月汇总。按客户ID进行key切汇总，计算每位客户当月的通话总量和总金额。输出每个客户的汇总记录。

Demonstrates the classic COBOL control-break (key break) pattern:

• Read sorted input file grouped by KEY
• Compare WS-PREV-KEY to detect key change
• On key change: write summary (KEY, COUNT, TOTAL) and reset accumulators
• At end-of-file: write final group summary
• Accumulate grand total across all groups

Files

File	Purpose
main-07-keybreak-summary.cbl	COBOL program (fixed format)
data-gen.sh	Generate sorted test data
run.sh	Compile, run, verify output

Input Record

Field	Type	Length
KEY	PIC X	10
AMOUNT	PIC 9	10

Output Record

Field	Type	Notes
KEY	PIC X(10)	Group key
COUNT	PIC Z(5)9	Record count in group
TOTAL	PIC Z(9)9	Sum of AMOUNT in group