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 |
