Operators and syntax

5.5 Operators and syntax

There are two ways to write certain commands. For example, to add 4 and 7, there are two possibilities: you can either use the primitive sum which expects two arguments: sum 4 7, or you can use the operator +: 4+7. Both have the same effect.

This table shows the relationship between operators and primitives:

`sum`	`difference`	`product`	`quotient`
+	-	*	/
`or`	`and`	`equal?`
\| (ALT GR+6)	&	=

There are two other operators with no associated primitive:

Operator “Less than or equal to”: <=
Opérator “Greater than or equal to”: >=

Note: The two operators | and & are specific to XLOGO. They do not exist in traditional versions of LOGO. Here are some examples of usage:

 pr 3+4=7-1 ----> false
 pr 3=4 | 7<=49/7 ----> true
 pr 3=4 & 7=49/7 ----> false