A1P7

The Condition object is a decision-making device that works like a railroad switch. It compares variables and redirects the flow of execution depending on the results of the comparison. At the heart of the Condition object is a logical expression that compares values contained in variables, or evaluated from other expressions. Logical expressions always evaluate to one of two values: YES or NO.

The Condition object switches the direction of flow to one of its two outlets, depending on the outcome of evaluation of the expression contained in the object. The Yes or No orientation is set in the Inspector:

The following examples illustrate the concept of logical expressions:

Logical expression Evaluates to

Amount > 100.0 YES if Amount is greater than 100.0, otherwise NO

Quantity != 0 YES if Quantity is not zero; otherwise NO

Debit + Credit < OldNet YES if sum of Debit and Credit is less than OldNet, otherwise NO.

Price < 5.0 AND Quantity > 3 YES if both conditions evaluate to YES: Price is less than 5.0 and
Quantity is greater than 3. If any of the two conditions evaluate to NO,
the final result is NO.

Discount > 0 OR Amount <= 1.0 YES if any of the two conditions evaluate to YES: Discount is greater
than zero, or Amount is less than or equal to 1.0. If both conditions
evaluate to NO, the final result is NO.

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	Logical expression	Evaluates to

	Amount > 100.0	YES if Amount is greater than 100.0, otherwise NO

	Quantity != 0	YES if Quantity is not zero; otherwise NO

	Debit + Credit < OldNet	YES if sum of Debit and Credit is less than OldNet, otherwise NO.

	Price < 5.0 AND Quantity > 3	YES if both conditions evaluate to YES: Price is less than 5.0 and
		Quantity is greater than 3. If any of the two conditions evaluate to NO,
		the final result is NO.

	Discount > 0 OR Amount <= 1.0	YES if any of the two conditions evaluate to YES: Discount is greater
		than zero, or Amount is less than or equal to 1.0. If both conditions
		evaluate to NO, the final result is NO.