Variables

Programmers often think of variable names as names for memory locations, but there is much more to a variable than just a name.
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A program variable is an abstraction of a computer memory cell or collection of cells.

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A variable can be characterized as a sextuple of attributes

(name, address, value, type, lifetime, and scope)

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A program variable is not associated with a machine address

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In many languages, it is possible for the same variable to be associated with different addresses at different times in the program

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A memory address in the program can be accessed by

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Two variables are aliases

Variable named sum and totalwhere both are aliases.  If the following operations are made to total, what is the value of sum?

sum = 1
total = 2
total = total + 3
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A value of a variable is stored in exactly a single physical memory cell

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In Java, a declared variable rose is same as variable ROSE

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In C++, pointer variables and references

Two pointer variables are aliases when they point to the same memory location. The same is true for reference variables.

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In C and C++, union types can be used to create aliases in a program

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