What is this example trying to say?

[JLWest]

Code: Pascal  [Select][+][-]

1. Program Example79;
2.  
3. { This program demonstrates the RightStr function }
4.  
5. Uses sysutils;
6.  
7. Begin
8.   Writeln (RightStr('abcdefghijklmnopqrstuvwxyz',20));
9.   Writeln (RightStr('abcdefghijklmnopqrstuvwxyz',15));
10.   Writeln (RightStr('abcdefghijklmnopqrstuvwxyz',1));
11.   Writeln (RightStr('abcdefghijklmnopqrstuvwxyz',200));
12. End.

I don't get it. Found this while trying to find some way of extracting info from a string.

[taazz]

https://www.freepascal.org/docs-html/rtl/sysutils/rightstr.html

[wp]

Run it. Compare the output with the numbers given as parameters.

[balazsszekely]

Take a look at the attached image.

[JLWest]

https://www.freepascal.org/docs-html/rtl/sysutils/rightstr.html

Yea; that's where I got it from and didn't understand it.

I guess I could build a program and run it.

[rvk]

Take a look at the attached image.

If Count is larger than the actual length of S only the real length will be used.

[wp]

I guess I could build a program and run it.

This is no effort at all: Click "File" > "New" and select "Program" from the "Project" node in the left tree.  Since the code in post #1 is a complete program (it begins with "Program" and ends with "end.") copy the code from the forum page into the clipboard. Return to Lazarus, select the entire auto-generated code by pressing  CTRL+A and paste the copied code from to clipboard into the Lazarus editor window. Press F9 to run. - That's all.

[balazsszekely]

@rvk
I meant it as a funny illustration and apparently I failed miserably. 

If Count is larger than the actual length of S only the real length will be used.

It's obvious(in my opinion) that you cannot copy more then the actual length of the string.

[rvk]

If Count is larger than the actual length of S only the real length will be used.

It's obvious(in my opinion) that you cannot copy more then the actual length of the string.

Ah, well, this is the Beginners-subforum so I wouldn't be so sure it's obvious to all those beginners

[JLWest]

Ok I got it. But, IMO this it's a lousy example.

I was reading an example on the form and in the comments section it said something like "this is very similar to the C function xyx.

I'm think I don't know C, I'm trying to learn Pascal. Should I learn C first? Then I would understand what this is trying to say.

Oh well. The hardest 3 years of my life was 3rd grade.
 

[Leledumbo]

Ok I got it. But, IMO this it's a lousy example.

I was reading an example on the form and in the comments section it said something like "this is very similar to the C function xyx.

I'm think I don't know C, I'm trying to learn Pascal. Should I learn C first? Then I would understand what this is trying to say.

Oh well. The hardest 3 years of my life was 3rd grade.
 

No, you don't have to. What's so hard about understanding the description:

RightStr returns the Count rightmost characters of S. It is equivalent to a call to Copy(S,Length(S)+1-Count,Count).

? Just substitute the variables with actual values and it's plain english.

[molly]

What's so hard about understanding the description:

Reading the firstmost description 

Return a number of characters from a string, starting at the end.

Perhaps it is because English isn't my native tongue but, at first glance (acting noob) and taking the following line:

Code: [Select]

Writeln (RightStr('abcdefghijklmnopqrstuvwxyz',5));
would mean write out "zyxwv"

Or is that too far fetched ?

[Julius7]

RightStr returns the Count rightmost characters of S. It is equivalent to a call to Copy(S,Length(S)+1-Count,Count).

If Count is larger than the actual length of S only the real length will be used.


See also


LeftStr
 Return a number of characters starting at the left of a string.
 

Trim
Trim whitespace from the ends of a string.
 

TrimLeft
Trim whitespace from the beginning of a string.
 

TrimRight
Trim whitespace from the end of a string.



thks

js