Free pascal example if else5/1/2023 ![]() ![]() That means later on we may expand the meaning of certain directives like e. g. Some defines have an extended meaning in another style. We will describe the directives in the context of the style. We will show you the difference between the modes and how to efficiently use them. Syntax: Syntax for the if-then-else statement is: if condition then S1 else S2 Where, S1 and S2 are different statements. Example 2: An if-then statement can be followed by an optional else statement, which executes when the Boolean expression is false. In brief, this program shows you whats happening when certain information is requested on your computer. We will use both lowercase and uppercase examples. The if-then-else if-then-else Statement 5. When an exception is raised in a version 3 setup, if the exception is not acted upon by On or Else statements, then a check is made to see if we are in a nested. Note the syntax here is not case sensitive as conforms to all Pascal syntax. Modern Free Pascal and Delphi style directives.Turbo Pascal and early Delphi style directives.Library version: interfaces may have changed with certain versionsįPC supports four different styles of conditional compilation:.Compiler version: certain compiler features may have been present only since a certain version. ![]() ![]() Licensing opensource and closed source parts.Natural language selection (where resourceStrings do not suffice).They can be used for a variety of purposes like: This is again one statement (if) which have one statement after then (which consists of two statements). If the expression evaluates to True then the statement following the then keyword isexecuted. If you need more than one statement in then part of the if, you would write: if x<0 then begin x : -x y : 3 end. The expression between the if and then keywords must have a Boolean result type. These surround any arbitrary amount of code that may be ignored or remain included based on an expression provided as evaluated at compile-time. For example: if x<0 then x : -x is one statement. Some compilers need an additional tool called pre-processor, FPC however has all required functionality built-in.įor FPC and in de-facto most compiled languages, conditional compilation is implemented by specially crafted comments that are then seen as compiler directives. Conditional compilation needs to be supported in some way or other. ![]()
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