String Problem

You need to show the code for MyString.

I'm guessing you didn't implement a copy constructor (i.e. MyString(const MyString &) {...}) and so in the first case you are getting a binary copy.

It sounds like you have a MyString constructor that allocate some default memory for the string, while the operator = does not. Is that right?
You should probably post your code on this one...

A copy constructor is used to initialize like this. If you haven't defined a copy constructor, in the code you posted str3 will be initialized with a memberwise (all members are copied by value) copy of str2, which is probably not what you want.

Thanks for the help so far. Here is the code:

###################################################################
t3q4.h

#ifndef _t3q4_h_
#define _t3q4_h_

//
// include files
//
#include <iostream>
#include <cstring>
#include <cstdio>

//
//
class MyString
{
public:
MyString();
virtual ~MyString();
};

#endif


########################################################

t3q4.cpp

#include "t3q4.h"

//
// using directive
//
using namespace std;

//
// Main program entry point
//
int main(int argc,char **argv)
{

//
// should word
//

string str;
str.print(); //this one should print a blank string

string str2("Test String");
str2.print();

string str3 = str2;
str3.print();

string str4("Second String");
str4.print();
string str5(" This Shall Be Added");
str5.print();


strcat() function

str4.append(str5);
str4.print();


//return from main
return 0;
}


I hope ya'all can help me.
Thanks in advance

Huh? What's "string" ? It doesn't look like MyString does much of anything, nor have you tried to use it anywhere.

And why are you trying to implement a string anyway? What do you need that can't be done with std::string?

Assuming c++, the problem your are having is generally related with not using std::string.

However, I must note that its admirable that you have your own string class, as opposed to using raw char arrays.

Throw this out the window if you are building a string class as a learning experience...

EDIT: I didn't get to read your second post...

Since you have not posted your full string code (otherwise how could your project compile at all ), I cannot say why it is failing...

EDIT EDIT: t3q4.h/ t3q4.cpp ? What kind of names are those? Maybe I'm a little suspicious seeing as how this could potentially be expanded to t(est?)3q(uestion?)4

Quote:

Original post by rip-off EDIT EDIT: t3q4.h/ t3q4.cpp ? What kind of names are those? Maybe I'm a little suspicious seeing as how this could potentially be expanded to t(est?)3q(uestion?)4

;-)

No, since I am German, I give my progs german abbreviations.

t = Test
q = Quelltext (or in English: Sourcecode :) )



But still, thanks a lot