Null Values

[gust1480]

How do i determine if an inputed value has a Null value?! Cause I have a program that will as for you to input a number and it is possible for the user not to input at all so how do i determine it?!

 

[prakal]

You could check the field as shown below:

If your_field NOT NUMERIC
   send error message or intialize your_field with zeros

I hope this is what you were looking for.

prakal

 

[MarcLodge]

Check the MDT flag for -1?

 

[sunbhu082]

if ur field is defined as ALphanumberic ( usual case ) ,
then u can check like below

if field is low-values
send error map
endif

 

[taurusvl]

You must first find out if your MDT is on or off by default. If it is on the field will automaticly take the deufault for te field (zero if numeric and space if alpha), if mdt is off You can check te length field and the attribute bite. If the attribute byte has a value of hex 80 then te eof key has been pressed (lenght wil be zero) else the length field wil have a value higher than zero. After these testst You can preform tests for nummeric if nessecerry.