Return From Procedure

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Return (From Procedure)

Control flow statement to return from a procedure or GoSub.

Syntax

Return expression

Description

Return is used to return from a procedure.

Because Return could mean return-from-gosub or return-from-procedure, Option Gosub and Option Nogosub can be used to enable and disable GoSub support. When GoSub support is disabled, Return is then recognized as return-from-procedure. When GoSub support is enabled, Return is then recognized as return-from-gosub.

Return (from procedure) is used inside a procedure to exit the procedure possibly with a return value:

Warning: Whatever the output branch used, the return value must be always defined, otherwise an unexpected behavior may occur.

Remarks

Dialect Differences

• In the -lang fb dialect Return always means return-from-procedure. In the -lang qb dialect, Return means return-from-gosub by default unless changed with Option Nogosub, in which case the compiler will recognize Return as return-from-procedure.
  In the -lang fblite dialect, Return means return-from-procedure by default unless changed with Option Gosub, in which case the compiler will recognize Return as return-from-gosub.

Differences from QB

• None when using the -lang qb dialect.

See also

• Sub
• Function
• GoSub
• Return (From Gosub)

Examples

'' Return from function

Type rational              '' simple rational number type

    numerator As Integer

    denominator As Integer

End Type

'' multiplies two rational types

Function rational_multiply( r1 As rational, r2 As rational ) As rational

    Dim r As rational

    '' multiply the divisors ...

    r.numerator   = r1.numerator   * r2.numerator

    r.denominator = r1.denominator * r2.denominator

    '' ... and return the result

    Return r

End Function

Dim As rational r1 = ( 6, 105 )   '' define some rationals r1 and r2

Dim As rational r2 = ( 70, 4 )

Dim As rational r3

r3 = rational_multiply( r1, r2 )  '' multiply and store the result in r3

'' display the expression

Print r1.numerator & "/" & r1.denominator; " * ";

Print r2.numerator & "/" & r2.denominator; " = ";

Print r3.numerator & "/" & r3.denominator

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Category: Control Flow Statements
Kind: keyword

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