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Infile and Input

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Contributor
Posts: 62

Infile and Input

why can't input comes before infile ?

 

data a;

infile "path";

input a b ;

run;

 

And how PDV works,like first it read the values from infile and then it assigns the variable in PDV.

 

 

 

Super User
Posts: 5,424

Re: Infile and Input

Because there is a dependency - input needs a source to input from. This us syntax, just accept it. The why's can discuss with the developers in Cary...

And yeah, something like that.
Data never sleeps
Super User
Posts: 7,758

Re: Infile and Input

Since the infile can dynamically change during data step execution (ie by using the filevar= option), the position of the infile statement within the code is important.

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Super User
Super User
Posts: 7,036

Re: Infile and Input

The order of the INFILE and INPUT statements matter because they are executale statements. You can have multiples of each in the same data step.  You could have an INPUT statement before any INFILE statement, but then it would expect there to be a CARDS (datalines) statement for it to find the data to read. 

 

What variables are defined in your data step are determined when the step is compiled.  The order of the variable is determined by the order that the complier sees them.  When the INPUT statement runs it will place the values it reads into the locations for those variables.

 

 

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