## To easily create new instances of the rational number abstraction.

## To manipulate rational numbers using arithmetic operations, yielding new rational number results.

## It should be possible to mix rationals and other arithmeticquantities in the same expression.

## It should be possible to assign a rational number value to arational number variable.

## The modification forms of assignment should be supported.

## To compare one rational number to another.

## It should be possible to perform input and output operations with rational numbers.

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