If and Then
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This keyword precedes a condition, is required to be followed by then and may optionally be followed by else.
If then
if condition
then true_statement
else false_statement;
Condition is a Boolean expression that evaluates to true or false. true_statement is executed if condition evaluates to true. false_statement is executed if condition evaluates to false. An error occurs if condition does not evaluate to a boolean value.
More statements in "if then" statement
If you need two or more statements for true_statement or false_statement, place them within a begin ... end Block.
if boolean_condition then
begin
statement_one;
statement_two;
statement_three;
end;
Keywords: begin — do — else — end — for — if — repeat — then — until — while