cobol-java-v3/benchmark-programs/05-branch-if/README.md

05-branch-if — IF Branch Program

电信业务场景

料金阶梯判定。根据通话时长进行IF条件分支，将用量分为低额/中额/高额三个料金段，分别写入不同输出文件。

Demonstrates GnuCOBOL IF branching patterns:

• IF 2-way (ELSE): Test DATA1 prefix for "SPECIAL"
• IF 3-way (ELSE IF): Branch DATA2 value to three output files
• Compound AND/OR: Combine multiple conditions in one IF
• 88-level condition name: Implicit condition test on KEY field
• IF nested 3 levels: Nested IF checks on DATA2 and KEY

Files

File	Purpose
main-05-branch-if.cbl	COBOL program (fixed format)
data-gen.sh	Generate 12-records FILE-IN.DAT
run.sh	Compile, run, verify outputs

Input Record

Field	Type	Length
KEY	PIC X	10
DATA1	PIC X	20
DATA2	PIC 9	10

Branch Logic

Condition	Output File
DATA2 < 1000	FILE-OUT-A.DAT
DATA2 >= 1000 AND <= 5000	FILE-OUT-B.DAT
DATA2 > 5000	FILE-OUT-C.DAT