Rice Lake iRite IDE - Manual (Page 28)

24 920i Programming Reference
The if-else is used when the program must decide which of exactly two different paths of execution must be
executed. The path that will execute the statement or statements in will be chosen if
evaluates to true. Here is an example:
if iAge => 18 then
sStatus := "Adult";
else
sStatus := "Minor";
end if;
If the statement is false, then the statement or statements in will be executed. Once the
expression is evaluated and one of the paths is chosen, the expression is not evaluated again. This means the
statement will terminate after one of the paths has been executed.
For example, if the expression was true and we were executing , and within the code in
we change some part of so it would at that moment evaluate to false,
would still not be executed. This point is more relevant in the next form called the if-elsif.
ELSIF expr stmt-list THEN
Figure 3-14. Optional Else-If Statement Syntax
The if-elsif version is used when a multi-way decision is necessary and has this general form:
if then
elsif then
elsif then
elsif then
else
end if;
Here is an example of the if-elsif form:
if rWeight <= 2.0 then
iGrade := 1;
elsif (rWeight > 2.0) and (rWeight < 4.5) then
iGrade := 2;
elsif (rWeight > 4.5) and (rWeight < 9.25) then
iGrade := 3;
elsif (rWeight > 9.25) and (rWeight < 11.875) then
iGrade := 4;
else
iGrade := 0;
sErrorString := "Invalid Weight!";
end if;