I have a situation where cell D4 might contain either of the following
12 or A9
Another cell, H2, will contain the formula -
IF(D4=12,"yes",IF(D4="A9","no",""))
This formula deals with a cell that will contain either a number or an
alphabetic character. However the cells value will always be alphabetic.

Still another cell, H5, will contain the formula -
IF(D4=12,D4,IF(D4="A9",20,""))
This formula deals with a cell that will contain either a number or an
alphabetic character. This cells value might also be a number or an
alphabetic character.

Should cell D4 be number formatted as "general" or "text"?
Should cell H2 be number formatted as "general" or "text"?
Should cell H5 be number formatted as "general" or "text"?

With general format used for all cells, my macro stalls occasionally.
I think one or more of these cells are causing the problem.

Is text format the ideal format for any or all of these 3 cells?

Thankyou
Ed