CComCurrency Class

CComCurrency has methods and operators for creating and managing a CURRENCY object.

class CComCurrency

Members

Public Constructors

Name	Description
CComCurrency::CComCurrency	The constructor for a CComCurrency object.

Public Methods

Name	Description
CComCurrency::GetCurrencyPtr	Returns the address of an m_currency data member.
CComCurrency::GetFraction	Call this method to return the fractional component of a CComCurrency object.
CComCurrency::GetInteger	Call this method to return the integer component of a CComCurrency object.
CComCurrency::Round	Call this method to round a CComCurrency object to the nearest integer value.
CComCurrency::SetFraction	Call this method to set the fractional component of a CComCurrency object.
CComCurrency::SetInteger	Call this method to set the integer component of a CComCurrency object.

Public Operators

Name	Description
CComCurrency::operator -	This operator is used to perform subtraction on a CComCurrency object.
CComCurrency::operator !=	Compares two CComCurrency objects for inequality.
CComCurrency::operator *	This operator is used to perform multiplication on a CComCurrency object.
CComCurrency::operator *=	This operator is used to perform multiplication on a CComCurrency object and assign it the result.
CComCurrency::operator /	This operator is used to perform division on a CComCurrency object.
CComCurrency::operator /=	This operator is used to perform division on a CComCurrency object and assign it the result.
CComCurrency::operator +	This operator is used to perform addition on a CComCurrency object.
CComCurrency::operator +=	This operator is used to perform addition on a CComCurrency object and assign the result to the current object.
CComCurrency::operator <	This operator compares two CComCurrency objects to determine the lesser.
CComCurrency::operator <=	This operator compares two CComCurrency objects to determine equality or the lesser.
CComCurrency::operator =	This operator assigns the CComCurrency object to a new value.
CComCurrency::operator -=	This operator is used to perform subtraction on a CComCurrency object and assign it the result.
CComCurrency::operator ==	This operator compares two CComCurrency objects for equality.
CComCurrency::operator >	This operator compares two CComCurrency objects to determine the larger.
CComCurrency::operator >=	This operator compares two CComCurrency objects to determine equality or the larger.
CComCurrency::operator CURRENCY	Casts a CURRENCY object.

Public Data Members

Name	Description
CComCurrency::m_currency	The CURRENCY variable created by your class instance.

Remarks

CComCurrency is a wrapper for the CURRENCY data type. CURRENCY is implemented as an 8-byte two's-complement integer value scaled by 10,000. This gives a fixed-point number with 15 digits to the left of the decimal point and 4 digits to the right. The CURRENCY data type is extremely useful for calculations involving money, or for any fixed-point calculations where accuracy is important.

The CComCurrency wrapper implements arithmetic, assignment, and comparison operations for this fixed-point type. The supported applications have been selected to control the rounding errors that can occur during fixed-point calculations.

The CComCurrency object provides access to the numbers on either side of the decimal point in the form of two components: an integer component which stores the value to the left of the decimal point, and a fractional component which stores the value to the right of the decimal point. The fractional component is stored internally as an integer value between -9999 (CY_MIN_FRACTION) and +9999 (CY_MAX_FRACTION). The method CComCurrency::GetFraction returns a value scaled by a factor of 10000 (CY_SCALE).

When specifying the integer and fractional components of a CComCurrency object, remember that the fractional component is a number in the range 0 to 9999. This is important when dealing with a currency such as the US dollar that expresses amounts using only two significant digits after the decimal point. Even though the last two digits are not displayed, they must be taken into account.

Value	Possible CComCurrency assignments
$10.50	CComCurrency(10,5000) or CComCurrency(10.50)
$10.05	CComCurrency(10,500) or CComCurrency(10.05)

The values CY_MIN_FRACTION, CY_MAX_FRACTION, and CY_SCALE are defined in atlcur.h.

Requirements

Header: atlcur.h

See Also

Reference

COleCurrency Class

Other Resources

CURRENCY Data Type [Automation]

ATL Class Overview