Difference between revisions of "If and Then"
From Lazarus wiki
Jump to navigationJump to search (usage of Template:Translate; eliminate excessive space) |
m (Fixed template loop) |
||
Line 1: | Line 1: | ||
− | {{ | + | {{LanguageBar}} |
+ | |||
The <syntaxhighlight lang="pascal" enclose="none">if</syntaxhighlight> [[Keyword|keyword]] precedes a condition, must be followed by <syntaxhighlight lang="pascal" enclose="none">then</syntaxhighlight> and a statement. | The <syntaxhighlight lang="pascal" enclose="none">if</syntaxhighlight> [[Keyword|keyword]] precedes a condition, must be followed by <syntaxhighlight lang="pascal" enclose="none">then</syntaxhighlight> and a statement. | ||
The statement may optionally be followed by [[Else|<syntaxhighlight lang="pascal" enclose="none">else</syntaxhighlight>]] and another statement. | The statement may optionally be followed by [[Else|<syntaxhighlight lang="pascal" enclose="none">else</syntaxhighlight>]] and another statement. | ||
Line 7: | Line 8: | ||
if condition | if condition | ||
then true_statement | then true_statement | ||
− | + | else false_statement; | |
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 06:31, 27 December 2019
│ 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
- Official documentation: Reference guide: § “The
If..then..else
statement” - IF, Tao Yue, Object Pascal Introduction
- If statement and semicolon
case
Keywords: begin — do — else — end — for — if — repeat — then — until — while