Control flow statement to jump to another part of the program
Syntax
Goto label
Description
Jumps code execution to a line label.
When using
Goto label to exit a scope, any local variables defined in that scope are destroyed (destructors are called).
Usage of
Goto label may be disallowed when it skips a variable definition but not the end of the variable's scope. If the variable requires construction, a compiler error is shown. For other variables, a compiler warning is shown. This is intended to prevent potential accesses to uninitialized variables, and ensures that automatic destruction never happens to an uninitialized variable.
For better source code readability, overuse of
Goto should be avoided in favor of more modern structures such as
Do...Loop,
For...Next,
Sub, and
Function.
Example
Goto there
backagain:
End
there:
Print "Welcome!"
Goto backagain
'' Compile with -lang qb or fblite
'$lang: "qb"
1 Goto 3
2 End
3 Print "Welcome!"
4 Goto 2
Dialect Differences
- Line numbers are allowed only in the -lang qb and -lang deprecated dialects.
- In the -lang qb and -lang fblite dialects, Goto label is allowed to skip any variable definitions, because nested scopes are not supported and all variable definitions are moved to the top of their procedure.
Differences from QB
See also