LET

   LET var,(expression1),op,(expression2)....

Arithmetic expressions are evaluated and the result is put in var. Arithmetic operators (op) permitted in expressions are:

+	add
-	subtract
*	multiply
/	divide

 

and the operands can be integer, packed or float, variable or constants Operator precedence is NOT obeyed: evaluation follows its order, from left to right; use parentheses to change this order. Parentheses cannot be nested.

expressions can be :

• a single variable (of the same type of var) (parentheses are unnecessary)
• a constant (of the same type of var) (parentheses are unnecessary)
• an expression enclosed in parentheses, that is in the form (var1,op,var2), where vars can be variables or constants

There are some limits in the use of this instruction:

• no operator precedence is considered: reckons are done in the order in which are written
• parentheses are used to modify the order of calculation
• only one level of parentheses are permitted (no nesting of expressions is permitted)
• all the variable must me of the same numeric type
• numeric type permitted are integer (F or H), packed (P) or Float (D)
• divide (/) between integer is always an integer (result is truncated to an integer value)
• no virtual decimal point is considered for packed