renamed cbl, jcl files and updated .md

Signed-off-by: Athar Ramzan <atharramzan.ofi@gmail.com>

Author: oathar

COBOL Programming Course #2 - Learning COBOL/COBOL Programming Course #2 - Learning COBOL.md

@@ -3613,13 +3613,13 @@ In COBOL, a division by zero will not result in a warning, it will immediately c
 `*
 
 ### Instructions
-1. Open the file `CBL0067.cbl`. Look at the line where division occurs:
+1. Open the file `CBL0013.cobol`. Look at the line where division occurs:
 
 ![](Images/image0068.png)
 
-2. In `CBL0067.cbl`, notice that DENOMINATOR is initialized to 0, causing a division-by-zero.
+2. In `CBL0013.cobol`, notice that DENOMINATOR is initialized to 0, causing a division-by-zero.
 
-3. Submit the JCL program: `CBL0067J.jcl`.
+3. Submit the JCL program: `CBL0013J.jcl`.
 
 *You should observe the job fails with a S0CB ABEND.*
 

COBOL Programming Course #2 - Learning COBOL/Labs/cbl/CBL0067.cobol renamed to COBOL Programming Course #2 - Learning COBOL/Labs/cbl/CBL0013.cobol

@@ -1,5 +1,5 @@
        IDENTIFICATION DIVISION.
-       PROGRAM-ID.    CBL0067.
+       PROGRAM-ID.    CBL0013.
        AUTHOR.        Athar Ramzan.
 
        DATA DIVISION.

COBOL Programming Course #2 - Learning COBOL/Labs/jcl/CBL0067J.jcl renamed to COBOL Programming Course #2 - Learning COBOL/Labs/jcl/CBL0013J.jcl

@@ -1,12 +1,12 @@
-//CBL0067J JOB 1,NOTIFY=&SYSUID
+//CBL0013J JOB 1,NOTIFY=&SYSUID
 //***************************************************/
 //COBRUN  EXEC IGYWCL
-//COBOL.SYSIN  DD DSN=&SYSUID..CBL(CBL0067),DISP=SHR
-//LKED.SYSLMOD DD DSN=&SYSUID..LOAD(CBL0067),DISP=SHR
+//COBOL.SYSIN  DD DSN=&SYSUID..CBL(CBL0013),DISP=SHR
+//LKED.SYSLMOD DD DSN=&SYSUID..LOAD(CBL0013),DISP=SHR
 //***************************************************/
 // IF RC = 0 THEN
 //***************************************************/
-//RUN     EXEC PGM=CBL0067
+//RUN     EXEC PGM=CBL0013
 //STEPLIB   DD DSN=&SYSUID..LOAD,DISP=SHR
 //SYSOUT    DD SYSOUT=*,OUTLIM=15000
 //CEEDUMP   DD SYSOUT=*