Question
What is the difference in data type "x" and "p"?
Answers
In MVS assembler data type X denotes hexadecimal data type  which unsigned pack. suppose you define VAR1 as "VAR1 DC X'01'".
It will occupy 1 byte in the memory and stored as: 

0 in the zoned nibble and 1 in the numeric nibble.
P denotes the packed data type, similar to COMP-3 in COBOL. 
if you declare any variable with this data type then it  must have a sign byte at last nibble. 

See following example:
VAR2 DC P'1'
it will occupy one byte in the memory and stored as '1C'.   Your Comment




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