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Output:

Program 3.14:Using double trail

Output:

Normally, when you use a double trailing (@@), the INPUT statement for the next iteration of the DATA

step continues to read the same record. SAS releases the record that is held by a double trailing (@@).

3.3 Line pointer controls:

In this lesson, we'll focus on two special situations that you might encounter when trying to read an input
raw data file into a SAS data set, namely:

 When you need to read across several records in the input raw data file in order to create one
observation in a SAS data set.
 When you need to read from just one record in the input raw data file in order to create multiple
observations in a SAS data set.

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