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Inside Macintosh: Operating System Utilities /

Chapter 3 - Mathematical and Logical Utilities / Mathematical and Logical Utilities Reference

Routines / Multiplying and Dividing Fixed-Point Numbers

FixMul
You can use the FixMul function to multiply a variable of type Fixed with another variable of type Fixed or with a variable of type Fract or LongInt.
FUNCTION FixMul (a, b: Fixed): Fixed;
a
The first operand, which can be a variable of type Fixed or a variable of type Fract or LongInt.
b
The second operand, which can be a variable of type Fixed or a variable of type Fract or LongInt.

DESCRIPTION
The FixMul function returns the product of the numbers specified in the a and b parameters. At least one of a and b should be a variable of type Fixed.
The returned value is in the format of a LongInt if one of a or b is a LongInt. It is a Fract number if one of a or b is Fract. It is a Fixed number if both a and b are Fixed numbers.
Overflows are set to the maximum representable value with the correct sign ($80000000 for negative results and $7FFFFFFF for positive results).

SEE ALSO
For a summary of the routines that perform operations on the Fixed and Fract data type, see Table 3-2 on page 3-26.




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