Propeller Manual

Table Of Contents

Operators – Spin Language Reference

The above example compares the value of Y with the value of Z and sets X to either: TRUE (-1)

Y is equal to or less than the value of Z, or FALSE (0) if Y is greater than the value of Z.

This operator is often used in conditional expressions, such as in the following example.

IF (Y =< 75)

Here, the Is Equal or Less operator returns TRUE if Y is equal to or less than 75.

Is Equal or Less has an assignment form,

=<=, that uses the variable to its left as both the first

operand and the result destination. For example,

X =<= Y 'Short form of X := X =< Y

Here, X is compared with Y, and if X is equal to or less than Y, X is set to TRUE (-1), otherwise X

is set to

FALSE (0). The assignment form of Is Equal or Less may also be used within

expressions for intermediate results; see Intermediate Assignments, page 147.

Boolean Is Equal or Greater ‘

=>’, ‘=>=’

The Boolean operator Is Equal or Greater compares two operands and returns

TRUE (-1) if the

first value is equal to greater than the second value, or returns

FALSE (0), otherwise. Is Equal

or Greater can be used in both variable and constant expressions. Example:

X := Y => Z

The above example compares the value of Y with the value of Z and sets X to either: TRUE (-1)

Y is equal to or greater than the value of Z, or FALSE (0) if Y is less than the value of Z.

This operator is often used in conditional expressions, such as in the following example.

IF (Y => 100)

Here, the Is Equal or Greater operator returns TRUE if Y is equal to or greater than 100.

Is Equal or Greater has an assignment form,

=>=, that uses the variable to its left as both the

first operand and the result destination. For example,

X =>= Y 'Short form of X := X => Y

Here, X is compared with Y, and if X is equal to or greater than Y, X is set to TRUE (-1),

otherwise

X is set to FALSE (0). The assignment form of Is Equal or Greater may also be used

within expressions for intermediate results; see Intermediate Assignments, page 147.

Page 172 · Propeller Manual v1.1