what does the @ mean ?

[tianerhu]

Could you tell me what the five @s mean  ?  Thank you .

[WarrenKuhfeld]

Hold the input data line for the next INPUT statement within that pass through the DATA step.

[tianerhu]

Thank you for your help.

[japelin]

Read the logs.
It's in a post a while back.

it's here.

[ballardw]

@ and a number means "read at column <that number>"

@"some text"   means "read from the column immediately after the text in the quotes if it is on the current line"

@ at the end of an input statement is the same as in https://communities.sas.com/t5/SAS-Programming/what-does-the-mean-in-the-input-statement/m-p/724747

https://documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=lestmtsref&docsetTarget=n...  has the documentation on various ways to specify which column to read from

Read the documentation for LIST , FORMATTED and NAMED input as well since these can be mixed on a single INPUT statement (with some limits)