[Rd] missing value break my if clause and crash my program

From: zisheng xing <zzxing_at_yahoo.com>
Date: Wed, 29 Feb 2012 04:36:50 -0800 (PST)


I have a program which is designed to read through a dbf file and carry out certain amount of further calculation if one condition obtained from the newly read line. The condition to determine if the calculation can be done is a if-clasue (i.e. if(m>0). Unfortunately, when m is missing, the program crashed. Just wonder who can help me out.  
Thanks

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