Variables

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

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(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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Only one variable

More than one variable

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Two variables are aliases

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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

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

2

1

3

5

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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

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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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A program variable is an abstraction of a computer memory cell or collection of cells.

Correct Answer

Explanation

A variable can be characterized as a sextuple of attributes

Correct Answer

Explanation

A program variable is not associated with a machine address

Correct Answer

Explanation

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

Correct Answer

Explanation

A memory address in the program can be accessed by

Correct Answer

Explanation

Two variables are aliases

Correct Answer

Explanation

A value of a variable is stored in exactly a single physical memory cell

Correct Answer

Explanation

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

Correct Answer

Explanation

In C++, pointer variables and references

Correct Answer

Explanation

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

Correct Answer

Explanation

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