string lengths as integers.

[Chris Schumacher]

I've been trying to use the following line of code to take a character
from the end of the string:

char b = pStr.substr(pSt r.length, 1);

However the compiler (the Visual C++ one) returns the following error:
'substr' : cannot convert parameter 1 from 'unsigned int
(void) const' to 'unsigned int' Conversion is a valid
standard conversion, which can be performed implicitly or by
use of static_cast, C-style cast or function-style cast

I tried static_casting, C-Style and function-style to assign an int
variable the value of the string length, but I got the exact same
error every time.
I also tried use strlen(pStr) and got a similar error (only the data
type of the original was different).

Is there any way to make this work?
Any help is greatly appreciated!

-==Kensu==-

[Ivan Vecerina]

Re: string lengths as integers.

"Chris Schumacher" <kensu__@hotmai l.com> wrote in message
news:kno8rvknau l8ml5tldv45hjgn 61f245tu5@4ax.c om...[color=blue]
> I've been trying to use the following line of code to take a character
> from the end of the string:
>
> char b = pStr.substr(pSt r.length, 1);[/color]
1) Did you mean:
pStr.length()
?
std::string::le ngth is a member function, not a data member.

2) in C++, char is not equivalent to a 1-character string.
To get the n-th character of a string, you need to
use the [] operator instead of substr.
And character indexes are 0-based, so the last character
is at position length()-1 :
char b = pStr[ pStr.length()-1 ];


hth
--

http://ivan.vecerina.com

[Andy Kashyap]

Re: string lengths as integers.


Length is a function, not a scalar.
Try pStr.substr(pSt r.length(), 1)

--
Andy Kashyap
to reply, sed -e 's/nospam//g' emailAddress



"Chris Schumacher" <kensu__@hotmai l.com> wrote in message
news:kno8rvknau l8ml5tldv45hjgn 61f245tu5@4ax.c om...[color=blue]
> I've been trying to use the following line of code to take a character
> from the end of the string:
>
> char b = pStr.substr(pSt r.length, 1);
>
> However the compiler (the Visual C++ one) returns the following error:
> 'substr' : cannot convert parameter 1 from 'unsigned int
> (void) const' to 'unsigned int' Conversion is a valid
> standard conversion, which can be performed implicitly or by
> use of static_cast, C-style cast or function-style cast
>
> I tried static_casting, C-Style and function-style to assign an int
> variable the value of the string length, but I got the exact same
> error every time.
> I also tried use strlen(pStr) and got a similar error (only the data
> type of the original was different).
>
> Is there any way to make this work?
> Any help is greatly appreciated!
>
> -==Kensu==-[/color]

[Catalin Pitis]

Re: string lengths as integers.

Try
char b = *pstr.rbegin();


Catalin

"Chris Schumacher" <kensu__@hotmai l.com> wrote in message
news:kno8rvknau l8ml5tldv45hjgn 61f245tu5@4ax.c om...[color=blue]
> I've been trying to use the following line of code to take a character
> from the end of the string:
>
> char b = pStr.substr(pSt r.length, 1);
>
> However the compiler (the Visual C++ one) returns the following error:
> 'substr' : cannot convert parameter 1 from 'unsigned int
> (void) const' to 'unsigned int' Conversion is a valid
> standard conversion, which can be performed implicitly or by
> use of static_cast, C-style cast or function-style cast
>
> I tried static_casting, C-Style and function-style to assign an int
> variable the value of the string length, but I got the exact same
> error every time.
> I also tried use strlen(pStr) and got a similar error (only the data
> type of the original was different).
>
> Is there any way to make this work?
> Any help is greatly appreciated!
>
> -==Kensu==-[/color]