dev-cpp-users

RE: [Dev-C++] string-version of '+'

[James G. <Jam...@Cl...>]

this might not be the best way but I've always had to split the code into
two statements.

Change this:
myString = "John has " + myApples + " apples";

To this:
myString = "John has " + myApples;
myString += " apples";

This is because it works from right to left.
In your code you are trying to assign the string " apples" to the char[20]
and the result from that to the string "John has " and then that lot to the
std::string.

I think that's correct...

Regards,

James.


-----Original Message-----
From: Gregor Peter [mailto:Gre...@dl...]
Sent: Thursday, December 07, 2000 2:58 PM
To: exc...@sp...; dev...@li...
Subject: [Dev-C++] string-version of '+'


You're right!

I tried it before in a direkt manner which doesn't work :-(

string myString;
char myApples[20];
int    myInt;

itoa( myInt, myApples, 10);
myString = "John has " + myApples + " apples";

I get following error message:
    invalid operands `const char[28]' and `char[20]' to binary `operator +'

How do I enshure to use the string-version of '+' instead of  the integer?

Gregor


> string my1String("John has");
> string my2String("apples!");
> char myApples[20] ;
> int   myInt = 6;
>
> itoa(myInt, myApples, 10);
>
> my1String = my1String + myApples + my2String ;
>
> That is you can put all of the strings into one, my1String.

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RE: [Dev-C++] string-version of '+'

[Chad S. <ho...@ho...>]

Or you can do it with parentheses..

string myString;

((myString += "John has ") += myApples ) += " apples";

But this sort of thing should really be done with a strstream. Perhaps if 
Gregor could show more specifically what his code looks like I could explain 
how he's using the strstream wrong.

Chad Simmons

>From: James Gordon <Jam...@Cl...>
>Reply-To: dev...@li...
>To: "'dev...@li...'"  
><dev...@li...>
>Subject: RE: [Dev-C++] string-version of '+'
>Date: Thu, 7 Dec 2000 15:34:59 -0000
>
>this might not be the best way but I've always had to split the code into 
>two statements.
>
>Change this:
>myString = "John has " + myApples + " apples";
>
>To this:
>myString = "John has " + myApples;
>myString += " apples";
>

[Snip]

>
>James.
>
>
>-----Original Message-----
>From: Gregor Peter [mailto:Gre...@dl...]
>Sent: Thursday, December 07, 2000 2:58 PM
>To: exc...@sp...; dev...@li...
>Subject: [Dev-C++] string-version of '+'
>
>
>You're right!
>
>I tried it before in a direkt manner which doesn't work :-(
>
>string myString;
>char myApples[20];
>int    myInt;
>
>itoa( myInt, myApples, 10);
>myString = "John has " + myApples + " apples";
>
>I get following error message:
>     invalid operands `const char[28]' and `char[20]' to binary `operator 
>+'

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RE: [Dev-C++] string-version of '+'

[Chad S. <ho...@ho...>]

Interesting.. I decided to actually test the code I was promoting, and I 
found a problem with the compiler.. It seems to bomb out on this bit of 
code..

#include <string>
#include <iostream>
#include <strstream>
using namespace std;

int main(int argc, char *argv[])
{
  string MyString;
  strstream MyStream;

  ((MyString += "John has ") += "4") += " apples!";

  cout << MyString << endl;

  MyStream << "John has " << 10 << " apples!";

  MyString = MyStream.str();

  cout << MyString << endl;

  return 0;
}

But I can compile the exact same code using the GNU G++ compiler without any 
errors or warnings or crashes.

So this most likely explains Gregor's problems.. But the fault is with the 
compiler, as the Standard C++ library dictates this functionality.

Chad Simmons
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RE: [Dev-C++] string-version of '+'

[Chad S. <ho...@ho...>]

Sorry, I need to clarify.. It's the

  MyString = MyStream.str();

line that the compiler bombs on.

This other line with the parentheses is ok.

  ((MyString += "John has ") += "4") += " apples!";

Chad Simmons

>From: "Chad Simmons" <ho...@ho...>
>Reply-To: dev...@li...
>To: dev...@li...
>Subject: RE: [Dev-C++] string-version of '+'
>Date: Thu, 07 Dec 2000 08:44:28 -0800
>
>Interesting.. I decided to actually test the code I was promoting, and I 
>found a problem with the compiler.. It seems to bomb out on this bit of 
>code..
>
>#include <string>
>#include <iostream>
>#include <strstream>
>using namespace std;
>
>int main(int argc, char *argv[])
>{
>  string MyString;
>  strstream MyStream;
>
>  ((MyString += "John has ") += "4") += " apples!";
>
>  cout << MyString << endl;
>
>  MyStream << "John has " << 10 << " apples!";
>
>  MyString = MyStream.str();
>
>  cout << MyString << endl;
>
>  return 0;
>}

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RE: [Dev-C++] string-version of '+'

[James G. <Jam...@Cl...>]

Your using strstream the wrong way, in the code below I'm using ostrstream
(output string stream) to be able to use the << operators.

#include <string>
#include <iostream>
#include <strstream>
using namespace std;

int main(int argc, char *argv[])
{
  string MyString;
  char MyChar[200];

  ((MyString += "John has ") += "4") += " apples!";

  cout << MyString << endl;

  // Wrap the char in an ostratream to enable the use of '<<' operator the
same as cout etc.
  ostrstream(MyChar, sizeof(MyChar)) << "John has " << 10 << " apples!" <<
ends;

  MyString = MyChar;

  cout << MyString << endl;

  return 0;
}

Regards,

James.


-----Original Message-----
From: Chad Simmons [mailto:ho...@ho...]
Sent: Thursday, December 07, 2000 4:58 PM
To: dev...@li...
Subject: RE: [Dev-C++] string-version of '+'


Sorry, I need to clarify.. It's the

  MyString = MyStream.str();

line that the compiler bombs on.

This other line with the parentheses is ok.

  ((MyString += "John has ") += "4") += " apples!";

Chad Simmons

>From: "Chad Simmons" <ho...@ho...>
>Reply-To: dev...@li...
>To: dev...@li...
>Subject: RE: [Dev-C++] string-version of '+'
>Date: Thu, 07 Dec 2000 08:44:28 -0800
>
>Interesting.. I decided to actually test the code I was promoting, and I 
>found a problem with the compiler.. It seems to bomb out on this bit of 
>code..
>
>#include <string>
>#include <iostream>
>#include <strstream>
>using namespace std;
>
>int main(int argc, char *argv[])
>{
>  string MyString;
>  strstream MyStream;
>
>  ((MyString += "John has ") += "4") += " apples!";
>
>  cout << MyString << endl;
>
>  MyStream << "John has " << 10 << " apples!";
>
>  MyString = MyStream.str();
>
>  cout << MyString << endl;
>
>  return 0;
>}

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Any other recipient should be aware that its contents may be 
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Whilst C. & J. Clark International Limited has taken steps 
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responsibility for screening incoming messages and the risk of such 
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Telephone: +44 (0) 1458 443131 
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