Description and Example of Program Byte variable

Byte variable :    

The assembler directive that defines a byte variable takes the following form:

        name DB    .                   initial_value

where the pseudo-op DB stands for "Define Byte"

             for example ,

This directive causes the assembler to associate a memory byte with the name ALPHA, and initialize it to 4,A question mark("?") used in place of an initial value sets aside an uninitialized byte ; for example ,

       BYTE     DB

The decimal range of initial values that can be specified is -128 to 127 if a signed  interpretation is being given ,or 0 to 255 for an unsigned interpretation .These are the ranges of values that fit in a byte.