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Inside Macintosh: QuickDraw GX Environment and Utilities /

Chapter 8 - QuickDraw GX Mathematics / QuickDraw GX Mathematics Reference

Mathematical Functions / Operations on wide Numbers

WideScale

You can use the WideScale function to obtain the bit number of the highest-order nonzero bit in the absolute value of a wide number.

short WideScale(const wide *w);

w

A pointer to the number whose scale is desired.

function result

The bit number of the highest order nonzero bit in the absolute value of w. The returned value is 63 if the highest-order bit is set, and 0 if the lowest order bit is set. If no bit is set, the return value is -1.