Post Reply 
direct string access is curious
10-17-2015, 12:17 PM
Post: #1
direct string access is curious
Suppose a := "12345";
Then a (1) gives "1" as advertised

BUT
a (1) := "Q" gives "1Q345" odd

And
a (0) := "Q" gives "Q2345" !!!

So LHS strings are 0..n-1 indexed
but RHS are are 1..n. indexed

Very curious. Good to know.If you play with string theory.

I work with android Prime only for now on my
Galaxy Tab Pro/Note 2
Find all posts by this user
Quote this message in a reply
10-17-2015, 01:28 PM
Post: #2
RE: direct string access is curious
Pretty sure it's a bug; all indices typically start at 1.

Graph 3D | QPI | SolveSys
Find all posts by this user
Quote this message in a reply
10-17-2015, 02:45 PM
Post: #3
RE: direct string access is curious
Careful. It bites back.

Seems this is true in cas view entry.(and maybe in #cas)

Not so in a ppl pgm or in home view with a home created variable.

But then in home view or pgm,

A:= "abc" A (1) returns the asc integer 65 IF A was created as a home var

but

A (1) gives "a" if A is a cas variable.

Welcome to oz.

I work with android Prime only for now on my
Galaxy Tab Pro/Note 2
Find all posts by this user
Quote this message in a reply
10-17-2015, 03:30 PM
Post: #4
RE: direct string access is curious
(10-17-2015 02:45 PM)ji3m Wrote:  Welcome to oz.

hahaha proper definition

My website: erwin.ried.cl
Visit this user's website Find all posts by this user
Quote this message in a reply
10-17-2015, 03:51 PM
Post: #5
RE: direct string access is curious
The variable A is a reserved variable for type real.

If you were to use a non-reserved variable, for example: AA:="abc" then the ascii value for the first item in the string, as referenced by AA(1), is returned as 97, (not 65, which is upper case A), and so forth.

-Dale-
Find all posts by this user
Quote this message in a reply
10-18-2015, 10:24 PM
Post: #6
RE: direct string access is curious
I really didnt use A. Just in my post.
That wasnt the point anyhow.
It seem that cas does treat left and rigtht hand reference differently.
Home and ppl treat MYSTRING (n) differently.

Home gives character codes, cas gives characters.

Sorry i forgot about predefined variables.
Never use them.
Dont use home screen.

I work with android Prime only for now on my
Galaxy Tab Pro/Note 2
Find all posts by this user
Quote this message in a reply
10-19-2015, 05:20 AM
Post: #7
RE: direct string access is curious
hello,

To get 1 character in home, do var(1,1)

Cyrille

Although I work for the HP calculator group, the views and opinions I post here are my own. I do not speak for HP.
Find all posts by this user
Quote this message in a reply
10-19-2015, 10:11 AM
Post: #8
RE: direct string access is curious
Perhaps useful(?):

If a variable contains a string, then (example):

var:="abcd";
n:=length(var);


var(2); // => ascii value of 2nd char: 98
var(2,2); // => sub string starting at the 2nd char for 2 chars length: "bc"
var(2,n); // => sub string starting at the 2nd char for length of string: "bcd"

If a string is an element within a list:

L0:={var}; // L0 is set to the contents of var

then:

L0(1); // => "abc"
L0(1,2); // => ascii value of the 2nd character of the 1st element: 98
L0(1,2,2); // => sub string beginning at the 2nd char for 2 chars: "bc"
L0(1,2,n); // => sub string beginning at the 2nd char for length of string: "bcd"

Nice shorthand for the SUB() function!

-Dale-
Find all posts by this user
Quote this message in a reply
Post Reply 




User(s) browsing this thread: