Yes — that is why is is called a variable.
The billions of bytes of main storage in your home computer are used to
store both machine instructions and data.
The electronic circuits of main memory (and all other types of memory) make
no distinction between the two.
When a program is running, some memory locations are used
for machine instructions and others for data.
Later, when another program is running
some of the bytes that previously held machine instructions
may now hold data, and some that previously held data
may now hold machine instructions.
Using the same memory for both instructions and data
was the idea of
To put a value in memory, and later to get it back, a program must have a name for each section of memory that it uses.
variable — a name for a location in main memory which uses a particular data type to hold a value.
Recall that a data type is a scheme for using bit patterns to represent a value. Think of a variable as a little box made of one or more bytes that can hold a value using a particular data type:
Variables have names such as
(Details will be given in a few pages.)
Must a variable always have a data type?