Parameters can be transferred between the main program and its functions\/methods using either value parameters (by value) or reference parameters (by reference). With all the different languages that I used before, this topic comes out from time to time. So I think it would better for me to summarize them at one place:<\/p>\n
C++ <\/strong> Java <\/strong> see the comment here<\/a><\/p>\n C#<\/strong> One uniqueness of C# compared to Java and C++ is its variable type, which will affect its behavior in passing parameters:<\/p>\n Perl<\/strong> PHP 5 <\/strong> example: myfunction(myclass &$c)<\/p>\n See the manual here<\/a>.<\/p>\n JavaScript<\/strong> Visual Basic <\/strong> example: Sub Myfunction1(ByVal v As Integer), Sub Myfunction2(ByRef v As Integer)<\/p>\n Oracle PL\/SQL\u00c2\u00a0<\/strong> Parameters can be transferred between the main program and its functions\/methods using either value parameters (by value) or reference parameters (by reference). With all the different languages that I used before, this topic comes out from time to time. So I think it would better for me to summarize them at one place: C++ parameters … <\/p>\n
parameters can be passed either by value or by reference<\/p>\n\n
example: myfunction(myclass c)<\/li>\n
example: myfunction(myclass &c)<\/li>\n<\/ul>\n
pass parameters by value only<\/strong>.
One of the consequences of such constraint is that there is no easy way to implement the simple swap(x,y) function as in C++ or C#<\/p>\n
similar to C++, parameters can be passed either by value or by reference<\/a><\/p>\n\n
example: myfunction(int i)<\/li>\n
example: myfunction(ref<\/strong> int i) or myfunction(out <\/strong>int i).
Difference: ref<\/strong> needs the variable initialized before being called, while out<\/strong> doesn’t, see the microsoft array example<\/a><\/li>\n<\/ul>\n\n
Pass by reference. The original variables in the main program are passed to subroutine in the special array @_. See comment here<\/a>.<\/p>\n
Similar to C++, parameters can be passed by value or reference.<\/p>\n
similar to Java, parameters are passed by value only. See comment here<\/a>.<\/p>\n
Similar to C++, parameters can be passed by value or reference.<\/p>\n
By default OUT and IN OUT parameters are passed by value and IN parameters are passed by reference, but NOCOPY keyword can be used to change the OUT and IN OUT parameters to be passed by reference. See reference here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"