71B: DIM a variable, but keep the old value if it's already the right type?

[J-F Garnier]

To answer the question in the title: "DIM a variable, but keep the old value if it's already the right type?", I would also use the TYPE keyword as Valentin suggested but the Math ROM is required.

An other solution, w/o Math ROM:
10 ON ERROR GOTO 30
20 X=X @ GOTO 40 ! check that X is a scalar variable
30 REAL X ! declare X of the right type if needed
40 OFF ERROR

J-F