# 11-divide-25 — 25-Division File Splitter

## 电信业务场景

明细25分割。将请求书明细行按25件一个文件进行分割。

Demonstrates dividing input records into groups of 25:

- **PERFORM VARYING counter**: Track record numbers across the loop
- **DIVIDE ... GIVING REMAINDER**: Calculate file number from record count
- **Close-write cycle**: Close old file, open new file at each boundary
- Tested at boundary conditions: 25 (exact), 26 (one extra), 24 (one short)

## Files

| File | Purpose |
|------|---------|
| `main-11-divide-25.cbl` | COBOL program (fixed format) |
| `data-gen.sh` | Generate N test records (default 26) |
| `run.sh` | Compile + run 3 test cases |

## Algorithm

```
DIVIDE record-count BY 25 GIVING Q REMAINDER R
IF R = 1 → open new FILE-OUT-NN
Write record to current file
```

## Output Files

- FILE-OUT-01.DAT: records 1-25
- FILE-OUT-02.DAT: records 26-50
- etc.