Inside Macintosh: QuickDraw GX Environment and Utilities /

Chapter 8 - QuickDraw GX Mathematics / QuickDraw GX Mathematics Reference

Mathematical Functions / Fixed-Point Operations

FractSquareRoot

You can use the FractSquareRoot function to calculate the square root of a fract number.

fract FractSquareRoot (fract source);

source

The number for which the square root is required.

function result

The square root of the fract number.

DESCRIPTION

The FractSquareRoot function returns the square root of the fract number specified by the source parameter. The number is interpreted as unsigned and in the range 0 through 4 - (2^-30). This means that bit 31 has a weight of 2, instead of -2. The result is an unsigned number in the range of 0 through 2.