Power of MONITOR Opcode

Power of MONITOR Opcode

We can catch any type of exception in the RPG program by using MONITOR opcode, it is like the MONMSG of CLP. You can put any code between MONITOR and ENDMON opcodes, so that whatever error occurred in this range will be monitored. See the example below:

Example:

Declare an array like Arr with DIM(2)
Declare 3 variables A, B and C with length 2,0. The below code shows how to monitor the runtime errors. The initial value of A and C is 0, initiate value of B is 11. 

 
              MONITOR       
B             DIV       A   
Arr(B)        Dsply         
              ON-ERROR  0102
'Div by 0'    Dsply         
              ON-ERROR  0121
'Index Err'   Dsply         
              ON-ERROR      
'Error'       Dsply         
              ENDMON

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This was first published in January 2003

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