PS TEXT FORMAT Reference Manual

Introduction to TFORM
3–8 11387 Tandem Computers Incorporated
Tips
If the value of the expression is a character string, the variable, after the
assignment, is a string variable.
If the expression has a numeric or Boolean value, the variable is of
numeric type after the assignment.
Once the type of a variable has been established, you can’t use it in a
place where an entity of a different type is required. You can, however,
change its type by assigning another value to it.