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Function VS Procedure

cybermilky
cybermilky asked
on
Medium Priority
172 Views
Last Modified: 2010-04-05
I'm confused between Function and Procedure. What are their difference?
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Software Engineer, Advisory
CERTIFIED EXPERT
Top Expert 2005
Commented:
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//As Russell stated, a function returns a result

function AbbreviateName(First, Last: String): String;
begin
  result:= First[1] + Last[1];
end;



var
 Abr: String;

 Abr:= AbbreviateName('SHane', 'Holmes');

Abr  = 'SH'



// and A Procedure does not return a result

procedure AbbreviateName(const First, Last: String): String;
var
begin
  ShowMesage(First[1] + Last[1]);
end;




Shane
Russell LibbySoftware Engineer, Advisory
CERTIFIED EXPERT
Top Expert 2005

Commented:

procedure AbbreviateName(const First, Last: String): String; <-- ????
var
begin
  ShowMesage(First[1] + Last[1]);
end;

Better dbl-check your procedure again....

Russell


OOPS!

<SMILE>

Shane

Author

Commented:
function AbbreviateName(First, Last: String): String;
 - means this function returns the result value in String?

While the procedure will not return values, so end of the first line of procedure will not have the return type.

Am I correct?

Author

Commented:
function AbbreviateName(First, Last: String): String;
 - means this function returns the result value in String?

While the procedure will not return values, so end of the first line of procedure will not have the return type.

Am I correct?

Author

Commented:
function AbbreviateName(First, Last: String): String;
 - means this function returns the result value in String?

While the procedure will not return values, so end of the first line of procedure will not have the return type.

Am I correct?
Russell LibbySoftware Engineer, Advisory
CERTIFIED EXPERT
Top Expert 2005

Commented:
Like I said, functions return results, so for example:

function AbbreviateName(First, Last: String): String;

returns a string, and can be used like so:

var
 s: String;
begin
  s:=AbbreviateName('Foo', 'Bar');
  ShowMessage(s);
end;

And procedures are functions that do not return any results.

procedure AbbreviateName(First, Last: String);
begin
 ShowMessage(First+','+Last);
 // No result returned
end;

used like:

begin
  AbbreviateName('Foo', 'Bar');
end;

------------------

Regards,
Russell
cybermilky,

 I believe Russell had already pinpointed by mistake. I had blocked and copied my function, pasted, and reedited it for the procedure, and didn't remove the string from the end, hense the OOPS post thereafter.

Shane

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