I took quiz from SAS programming 1, I think the length is 8. But the answer is 6. Could anyone help me about it?
When the data step compiler compiles the code, it sets variable attributes from the first encounter of a variable where the attribute can be deduced.
In your case this is the statement where the 6-character string "luxury" is assigned; subsequent changes in the length are ignored.
Make it a habit to put attribute-setting statements (ATTRIB, LENGTH, FORMAT, but also SET, MERGE, UPDATE) into the top of your data step code.
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