Less-than-or-equal

Less-than-or-equal, <=, is an inequality operator to test whether the value on the left is less than, or equal to, the value on the right.

<=

Availability	Present in all original versions of BBC BASIC.
Syntax	BASIC I-V	<num-var> = <numeric> <= <numeric> <num-var> = <string> <= <string>
Token (hex)	BASIC I-V	3C 3D (operator)
Description	BASIC I-V	Compares the values of the two operands and returns TRUE if they are equal, or if the left-hand operand is less than the right, and FALSE otherwise.
Associated keywords	=, <, >, >=, <>

Description

<= evaluates the expressions on either side, and compares their values. If the values are equal, or if the value on the left is less than the one on the right, it returns the Boolean value TRUE, otherwise it returns FALSE. It is usually used as the condition of an IF statement, but it is equally valid to assign the result to a variable.

The symbol is an ASCII substitute for ≤. The < comes first so that the = is not misinterpreted as an assignment statement (see =).

One numeric variable is less than another if it is nearer to negative infinity. If both numbers are negative, the one with the larger magnitude is less. For the definition of 'less-than' on strings, please see String collation.

It is not possible to daisy-chain (in)equality tests (for example IF bool% <= X = Y THEN ...), as the Group 5 operators do not associate. Please see = for more details.

Due to the numerical values of TRUE and FALSE in BBC BASIC, >= is, for these values, identical to A OR NOT B:

A	B	A <= B
FALSE	FALSE	TRUE
FALSE	TRUE	FALSE
TRUE	FALSE	TRUE
TRUE	TRUE	TRUE

-- beardo 23:23, 13 June 2007 (BST)