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IF-Statements

There are two forms of if statement: if...then and the if...then...else. The syntax of an if...then statement is

if expression then statement

where expression returns a Boolean value. If expression is True, then statement is executed; otherwise it is not. For example,

if J <> 0 then Result := I/J;

The syntax of an if...then...else statement is

if expression then statement1 else statement2

where expression returns a Boolean value. If expression is True, then statement1 is executed; otherwise statement2 is executed. For example,

if J = 0 then

Exit
else
Result := I/J;

The then and else clauses contain one statement each, but it can be a structured statement. For example,

if J <> 0 then

begin
Result := I/J;
Count := Count + 1;
end
else if Count = Last then
Done := True
else
Exit;