# 12-divide-100 — 100-Division File Splitter

## 电信业务场景

CDR数据100分割。将CDR数据按100件一个批处理单位进行分割，供后续系统处理。

Demonstrates dividing input records into groups of 100:

- **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: 100 (exact), 101 (one extra), 99 (one short)

## Files

| File | Purpose |
|------|---------|
| `main-12-divide-100.cbl` | COBOL program (fixed format) |
| `data-gen.sh` | Generate N test records (default 101) |
| `run.sh` | Compile + run 3 test cases |

## Algorithm

```
DIVIDE record-count BY 100 GIVING Q REMAINDER R
IF R = 1 → open new FILE-OUT-NN
Write record to current file
```

## Output Files

- FILE-OUT-01.DAT: records 1-100
- FILE-OUT-02.DAT: records 101-200
- etc.