// Definition of a constant
DCL-C   max_size 100;
DCL-C   max_size CONST(100);
DCL-C   file_name 'example.txt';

// Variable definition 
DCL-S   file_name CHAR(10);      CHAR(bytes)  ... bytes count between 1 and 16,773,104
DCL-C   msg_len 5000;
DCL-S   message CHAR(msg_len);   (5000 bytes)

DCL-S   city VARCHAR(33);        VARCHAR(bytes).. bytes count between 1 and 16,773,104
DCL-S   cmdparm VARCHAR(10:4);   :2 or 4 byte prfx stores the length of the item

DCL-S   some_number INT(10);     INT(digits)  ...