Specifying initial values for fields

 

We can specify the value to be used to initialize a field in a structure by coding the name of that field (without the prefix) as a parameter on the macro invocation, accompanied by the value required.

For example, to declare a message descriptor structure with the MsgType field initialized with MQMT_REQUEST, and the ReplyToQ field initialized with the string MY_REPLY_TO_QUEUE, use the following code:

MY_MQMD        CMQMDA           MSGTYPE=MQMT_REQUEST,             X
               REPLYTOQ=MY_REPLY_TO_QUEUE

If you specify a named constant (or equate) as a value on the macro invocation, use the CMQA macro to define the named constant. You must not enclose in single quotation marks (‘ ’) values that are character strings.

 

Parent topic:

Coding in System/390 assembler language

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