Defining a conditional construct
Conditional constructs organize multiple conditions (basic conditions or even loops) in an if-then-else logical sequence, creating complex expressions for evaluation.
A conditional construct always begins with one if-then block, which pairs two conditions together. The second condition in this pair is evaluated for TRUE/FALSE outcome only if the condition that preceded it returned a TRUE value.
After the initial if-then block, you can insert any number of optional elseif-then blocks. Again, each elseif-then block pairs two conditions, and the second condition in each pair is evaluated only if the condition that preceded it returned a TRUE value.
Finally, before the end of the full conditional construct, you can insert one last optional else statement, with a condition to be evaluated if all preceding if and elseif conditions returned FALSE values.
A conditional construct can be combined with basic conditions or nested within a loop. A conditional construct can also be enclosed within another conditional construct.
To define a conditional construct
- To insert the main if-then block of the conditional construct, click the drop-down arrow beside the New Condition icon and select the If... Then... End option.
Define a pair of conditions or loops for the if-then block, in the following manner:
- Select the if line.
Click the New Condition icon for a basic condition, or click the drop-down arrow beside this icon and select from the full range of available condition types.
- Basic Condition for a basic condition
- Foreach Loop, Count Loop, or Exists Loop for the loop of your choice
- In the displayed fields, define the condition as discussed in one of the following topics:
- (Optional) To insert an elseif-then block, select the line above where you want to insert it, and then click the drop-down arrow beside the New Condition icon and select the Elseif option. Then insert a pair of conditions — one after the elseif line and the other after the then line — as described in step 2 for the if-then block.
Repeat this step for any number of elseif-then blocks that you want to create.
- (Optional) To insert an else statement before the end line, use the Else option from the drop-down arrow beside the New Condition icon, and then insert one condition after the else line.