Difference between revisions of "If and Then"

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* Official documentation: [https://www.freepascal.org/docs-html/ref/refsu57.html Reference guide: § “The <code>If..then..else</code> statement”]
 
* Official documentation: [https://www.freepascal.org/docs-html/ref/refsu57.html Reference guide: § “The <code>If..then..else</code> statement”]
 
* [[IF]], Tao Yue, Object Pascal Introduction
 
* [[IF]], Tao Yue, Object Pascal Introduction
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* [[;#If statement and semicolon|If statement and semicolon]]
  
 
{{Keywords}}
 
{{Keywords}}
 
[[Category:Pascal]]
 
[[Category:Pascal]]
 
[[Category:Control Structures]]
 
[[Category:Control Structures]]

Revision as of 11:13, 24 January 2018

English (en)

The if keyword precedes a condition, must be followed by then and a statement. The statement may optionally be followed by else and another statement.


If then

if condition
	then true_statement
	else false_statement;

condition is a boolean expression that evaluates to true xor false. true_statement is executed if condition evaluates to true. false_statement is executed if condition evaluates to false. A compile-time error occurs if the type of condition does not evaluate to a boolean value.


Multiple statements in if then branch

If you need two or more statements for true_statement or false_statement, enclose them within a begin … end Block (compound statement).

if boolean_condition then
begin
	statement_zero;
	statement_one;
	statement_two;
end;


See also


Keywords: begindoelseendforifrepeatthenuntilwhile