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The INPUTNULL statement allows the definition of a character that will allow a null input to be seen by the INPUT@ statement. It takes the general form: 

INPUTNULL expression

Where expression should evaluate to a single character. Subsequently, any INPUT@ statement that sees only this character input before the new-line sequence will NULL the variable in which input is being stored.

If expression evaluates to the empty string '' then the default character of '_' is used to define a NULL input sequence.


The INPUT statement does not default to accepting the '_' character as a NULL input. 

An example of use is as: 

0001     INPUTNULL "&"
0002     INPUT @(10,10):Answer,1
0003     IF Answer = "" THEN
0004         CRT "A NULL input was received"
0005     END

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