Legacy Document

Inside Macintosh: Operating System Utilities /

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

Routines / Multiplying and Dividing Fixed-Point Numbers

FracMul

You can use the FracMul function to multiply a variable of type Fract with another variable of type Fract or with a variable of type Fixed or LongInt.

FUNCTION FracMul (a, b: Fract): Fract;

a

The first operand, which can be a variable of type Fract or a variable of type Fixed or LongInt.

b

The second operand, which can be a variable of type Fract or a variable of type Fixed or LongInt.

DESCRIPTION

The FracMul function returns the product of the numbers specified in the a and b parameters. At least one of a or b should be a variable of type Fract.

The returned value is in the format of a LongInt number if one of a and b is a LongInt number. It is a Fixed number if one of a or b is a Fixed number. It is a Fract number if both a and b are Fract 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.