Microsoft KB Archive/159093

= Windows NT Muldiv Function Returns Incorrect Value =

Article ID: 159093

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q159093



SYMPTOMS
Muldiv(0,0,-1) returns -1 when it should be 0. 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: Specifies the multiplicand.

nNumerator: Specifies the multiplie

nDenominator: 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.



CAUSE
The multiplier is positive, the multiplicand is positive, the divisor is negative. The result is negative when actually, the result was positive (0).



STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows NT version 4.0. This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: prodnt

Keywords: kbenv KB159093

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