Object-Oriented Design - Java Software Solutions: Foundations of Program Design - page 313

LISTING 7.4

continued

//-----------------------------------------------------------------
// Constructor: Sets up the rational number by ensuring a nonzero
// denominator and making only the numerator signed.
//-----------------------------------------------------------------
public RationalNumber ( int numer, int denom)
{
if (denom == 0)
denom = 1;

// Make the numerator "store" the sign
if (denom < 0)
{
numer = numer * -1;
denom = denom * -1;
}

numerator = numer;
denominator = denom;

reduce();
}

//-----------------------------------------------------------------
// Returns the numerator of this rational number.
//-----------------------------------------------------------------
public int getNumerator ()
{
return numerator;
}

//-----------------------------------------------------------------
// Returns the denominator of this rational number.
//-----------------------------------------------------------------
public int getDenominator ()
{
return denominator;
}

//-----------------------------------------------------------------
// Returns the reciprocal of this rational number.
//-----------------------------------------------------------------
public RationalNumber reciprocal ()
{
return new RationalNumber (denominator, numerator);
}