Arithmetic Operators in Configuration Constraints

An arithmetic operator allows you to perform an arithmetic operation on two items and are described in the following table. If an operand is a product, the value refers to the quantity of the product in the solution.

The operands in the expression can be two items or can be one item and a constant. For example, you can increase the quantity of an item by a constant amount.

If you specify an expression as one of the items, it must resolve to a quantity. If the expression resolves to true or false, then 1 is assigned to true, and 0 to false.

Results of calculations are handled differently for resources values than for product quantities. Calculation results for resources are expressed exactly, including a decimal point if necessary. Because product quantities represent discrete units, results involving them are rounded to the nearest integer.

Operator	Example	Description
Addition	A + B	Sum of A and B. A and B can be items or expressions. Result is floating point if A or B is floating point.
Subtraction	A - B	Subtracts B from A. A and B can be items or expressions. Result is floating point if A or B is floating point.
Negation	-(A)	Additive inverse of A. Uses only one operand. A can be an item or expression.
Multiplication	A * B	Product of A and B. Result is floating point if A or B is floating point. A and B can be items or expressions.
Division	A / B	Quotient of A divided by B. Truncates ratio to integer if both A and B are integers. Result is floating point if A or B is floating point. A and B can be items or expressions.
Modulo	%(A, B)	Remainder of A divided by B. For example, %(1900, 72) results in 28. If A or B is floating point, the value is first rounded to the nearest integer; then the remainder is computed as for integers. A and B can be items or expressions.
Minimum	min(A, B)	Result is the smaller of A and B and is floating point if A or B is floating point. A and B can be items or expressions.
Maximum	max(A, B)	Result is the larger of A and B and is floating point if A or B is floating point. A and B can be items or expressions.

The following table shows additional arithmetic operators that also take numeric operands and produce numeric results. Use them to control numeric accuracy or change numeric characteristics.

Operator	Example	How Used
Integer	int(A)	Truncates A down to an integer. For example, if the operand is 6.7, returns 6. A can be an item or expression. Useful only with properties.
Float	flo(A)	Converts A to a floating point. It is the same as multiplying the operand by 1.0. A can be an expression.
Absolute value	abs(A)	Returns the absolute value of A. A can be an item or expression.
Sign test	sgn(A)	Returns -1 if the quantity of A <0, 0 if A=0, 1 if A>0. A can be an expression.