Micro Focus Visual COBOL 2.3 Update 2 for Eclipse (UNIX) > Programming > COBOL Programming > Creating 64-bit Native COBOL Programs > Scan64 > Examples of Using Scan64 > Constant and Variable Indexing

Constant and Variable Indexing

Create the intermediate code file:
```
cob -a demo4.cbl
```
In this program, the record structure is such that:
- item1-1(2) and item1-3(2) are redefined by ptr2-notmod-1 and ptr2-notmod-2 respectively
- item1-2(2,1) and item1-2(2,2) are redefined by ptr2-mod-1 and ptr2-mod-2

Enter the command:

cobscan64 -m demo4

This produces the following report:

Processing file 'demo4.int' 
**Unsafe modification of pointer at (file: demo4.cbl, line: 26) 
  Modifier : ITEM1-2 (file: demo4.cbl, def: 13) 
  Pointer : PTR2-MOD-1 (file: demo4.cbl, def: 18) 

**Unsafe modification of pointer at (file: demo4.cbl, line: 27) 
  Modifier : ITEM1-2 (file: demo4.cbl, def: 13)
  Pointer : PTR2-MOD-1 (file: demo4.cbl, def: 18) 

**Unsafe modification of pointer at (file: demo4.cbl, line: 27) 
  Modifier : ITEM1-2 (file: demo4.cbl, def: 13)
  Pointer : PTR2-MOD-2 (file: demo4.cbl, def: 19)

Finished file 'demo4.int' - pointer problems could exist

No information is generated for prt2-notmod-[12]; however, the static indexing for item1-2 at line 26 produces a warning of unsafe modification for ptr2-mod-1, and the run-time indexing of item1-2 at line 27 produces warnings for both ptr2-mod-1 and ptr2-mod-2. As the program uses variable indexing, Scan64 cannot determine statically which pointers are really affected.