Division by zero error message in AWK


 
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# 1  
Old 12-08-2009
Division by zero error message in AWK

How can I modify my awk code to get rid of the divion by zero error message? If I run the script without an input file, it should return error message "Input file missing" but not divison by zero.

Code:

#!/bin/nawk -f
BEGIN {
if (NR == 0)
{print "Input file missing"}

}

{

sum=sum + $1
}

END {print "Average is", sum/NR}
# 2  
Old 12-08-2009
Test if NR is 0 before you do the sum/NR

Code:
END {
  if ( NR )
      print "Average is", sum / NR
    else
     print "Input file missing"
}

And remove the if statement from your BEGIN clause.
# 3  
Old 12-08-2009
Scottn, you are right, remove the wrong code.

Last edited by rdcwayx; 12-08-2009 at 08:27 PM..
# 4  
Old 12-08-2009
Calling exit won't prevent the END clause from being executed.

Code:
$ awk '{exit} END {print 3/((NR>0)?NR:1)}' x
3

If you don't pass a filename awk will wait for input.

In the BEGIN clause add:

Code:
if( ARGC == 1 ) exit

to prevent this.

Last edited by Scott; 12-08-2009 at 08:55 PM..
# 5  
Old 12-09-2009
Thanks so much. That works
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