2. Allocating Memory for Integer Variables

• Intel x86 CPU performs operations on different sizes of data.

• An integer is a whole number with no fractional part.

• In assembler, the variables are created by data allocation directives.

• Assembler declaration of integer variable assigns a label to a memory space allocated for the integer.

• The variable name becomes a label for the memory space. For example,

      MyVar  db  77h ; byte-sized variable called MyVar initialised to 77h
  

  where

  • MyVar is variable name

  • db is directive for byte-sized memory allocation

  • 77h is initializer specifying initial value.