Returns the maximum length of a string.
MAXLENGTH(x)
x is an expression that must have a computational type and should have a string type. Otherwise, it is converted to character.
dcl s char (40) varying;
    dcl t char (40) ;
    s = 'The Lawn, 22-30 Old Bath Road';
    put skip list ('maxlength(s) is: ', maxlength(s));   /* char var */
    put skip list ('maxlength(t) is: ', maxlength(t));   /* char       */
               		will print:
maxlength(s) is: 40 maxlength(t) is: 40
None.