MulDiv

The MulDiv function multiplies two 32-bit values and then divides the 64-bit result by a third 32-bit value. The return value is rounded up or down to the nearest integer.

int MulDiv(
  int nNumber,       // 32-bit signed multiplicand
  int nNumerator,    // 32-bit signed multiplier
  int nDenominator   // 32-bit signed divisor
);

Parameters

nNumber

[in] Specifies the multiplicand.

nNumerator

[in] Specifies the multiplier.

nDenominator

[in] Specifies the number by which the result of the multiplication (nNumber * nNumerator) is to be divided.

Return Values

If the function succeeds, the return value is the result of the multiplication and division. If either an overflow occurred or nDenominator was 0, the return value is –1.

Requirements

  Windows NT/2000: Requires Windows NT 3.1 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Winbase.h; include Windows.h.
  Library: Use Kernel32.lib.

See Also

File I/O Overview, File I/O Functions, Int32x32To64, UInt32x32To64