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Hi Guys,
I have this exam on Data Structures in C. I need some help wiht Binary Trees. I found the follwing code for Binary Tree Traversal abnd its perfect. It's a recursive implementattion. I need a non recursive version too. Could someone tell me where I coulfd find it.
<br />
<br />
<br />
void Pre_order (struct NODE *Node)<br />
{<br />
if (Node)<br />
{<br />
printf(" %c", Node->Info);<br />
Pre_order(Node->Left_Child);<br />
Pre_order(Node->Right_Child);<br />
}<br />
}<br />
<br />
<br />
<br />
void In_order (struct NODE *Node)<br />
{<br />
if (Node)<br />
{<br />
In_order(Node->Left_Child);<br />
printf(" %c", Node->Info);<br />
In_order(Node->Right_Child);<br />
}<br />
}<br />
<br />
<br />
<br />
void Post_order (struct NODE *Node)<br />
{<br />
if (Node)<br />
{<br />
Post_order(Node->Left_Child);<br />
Post_order(Node->Right_Child);<br />
printf(" %c", Node->Info);<br />
}<br />
}<br />
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Non-recursive traversals use a stack similar to the following (going off memory here, so it may not be exact):
<br />
void traverse (struct NODE *Node)<br />
{<br />
stack<NODE*> travStack;<br />
NODE* cur = Node;<br />
while (NULL != cur)<br />
{<br />
travStack.push(cur);<br />
printf(" %c", cur->Info);
cur = cur->Left_Child;<br />
printf(" %c", cur->Info);
while (NULL == cur && FALSE == travStack.empty())<br />
{<br />
cur = travStack.pop();<br />
cur = cur->Right_Child;<br />
}<br />
printf(" %c", cur->Info);
}<br />
}<br />
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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Hi,
I have some problems with managed Strings as function parameter.
See:
void f(int& x, String* s)
{
x=10;
s="hello"
return;
}
.....
String *s ="start";
int x= 0;
f(x,s);
....
Problem:
s doesn't get the new vale "hello"
is it possible to use a managed String in a function by reference ??
Thx
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Hi all 
Please help, I have next code :
I am building in Unicode
TCHAR array[100];
CString strText = _T("Cool");
_tcscpy_s(array,
sizeof(array),
strText
)
But the program halts and hangs, when performs _tcscpy_s method.
thank you
-- modified at 11:16 Friday 2nd June, 2006
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There's no problem in the snippet of code you have shown. The error, presumably, lies elsewhere.
Regards,
Nish
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big_denny_200 wrote: But the program halts and hangs, when performs _tcscpy_s method.
How are you verifying this?
"The largest fire starts but with the smallest spark." - David Crow
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Since _tcscpy_s is expanded to wcscpy_s call in Unicode version, you must specify the size of destination buffer in 2-byte unicode characters, not in bytes. Universal solution can look like this:
_tcscpy_s(array,
sizeof(array) / sizeof(TCHAR),
strText);
You got halts even if the source string was short enought, because -- in Debug version -- this function fills the buffer with 0xFD value.
-- modified at 11:33 Friday 2nd June, 2006
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Try explicitly casting the CString object:
<br />
TCHAR array[100];<br />
<br />
CString strText = _T("Cool");<br />
<br />
_tcscpy_s(array,
sizeof(array),
(LPCTSTR)strText
);<br />
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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(Actually, explicit casting from CString to LPCTSTR is not required even in printf-like calls -- at least in VS 6.0).
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Could you be more explicit ?
MSDN says, that second parameter of wcscpy_s must specify size of destination buffer in bytes, therefore in Unicode build destination size will be 100 * sizeof(TCHAR) (which is equal to sizeof(array)), but in you case it will be 100(which is not the size of destination buffer)
I am little confused.
thanks
-- modified at 12:02 Friday 2nd June, 2006
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It shouldn't be, but I've run into problems with it converting (implicitly) to char* instead of wchar_t* when I didn't explicitly cast it.
Looking back at the code again, I think he will run into another problem though. In non-UNICODE builds, he shouldn't notice anything, but in UNICODE builds, the sizeof(array) will actually return twice the size of the actual buffer. I believe the wstcpy_s function requires array size in elements, not bytes (I'll have to double-check that though). If I'm correct, he would just need to change that line from sizeof(array) to sizeof(array) / sizeof(TCHAR).
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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What is happening ? I am replying to Viorel Bejan and this post gooes in reply to Zac Howland's post 
Viorel Bejan wrote: Since _tcscpy_s is expanded to wcscpy_s call in Unicode version, you must specify the size of destination buffer in 2-byte unicode characters, not in bytes. Universal solution can look like this:
_tcscpy_s(array,
sizeof(array) / sizeof(TCHAR),
strText);
You got halts even if the source string was short enought, because -- in Debug version -- this function fills the buffer with 0xFD value.
Could you be more explicit ?
MSDN says, that second parameter of wcscpy_s must specify size of destination buffer in bytes, therefore in Unicode build destination size will be 100 * sizeof(TCHAR) (which is equal to sizeof(array)), but in you case it will be 100(which is not the size of destination buffer)
I am little confused.
thanks
-- modified at 12:02 Friday 2nd June, 2006
-- modified at 12:04 Friday 2nd June, 2006
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Actually, it says the second parameter of wcscpy_s must specify size of destination buffer in words (in bytes for non-Unicode). Thus, it is the size in characters and not size in bytes! If you are using a statically-allocated array as a destination, you can use the _countof macro instead of sizeof. However, sizeof(array) / sizeof(TCHAR) also returns the correct size.
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thanks, I did not pay attention to the WORD
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Word, man!
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Viorel Bejan wrote: You got halts even if the source string was short enought, because -- in Debug version -- this function fills the buffer with 0xFD value.
But in this specific case, it's not bad enough to cause a halt - since he has a 100 byte buffer and a 5 character string.
Regards,
Nish
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big_denny_200 wrote: But the program halts and hangs, when performs _tcscpy_s method.
(Offtopic sarcasm)
Glad to see these "safe" functions in action.
My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.
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Nemanja Trifunovic wrote: (Offtopic sarcasm)
Glad to see these "safe" functions in action.
Regards,
Nish
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According to:
http://msdn2.microsoft.com/en-us/library/td1esda9.aspx[^]
the sizeof(array) should correspond to the number of 'characters' - not 'bytes'.
So - in case of ANSI, it's bytes. In case of unicode, it's words (2-bytes).
When the code you listed compiles for unicode, sizeof(array) is 200 - which is double the actual number of characters.
Note that _tcscpy_s() zeros out the buffer after copying... and that's when you get the buffer overrun. You can find that out by stepping into _tcscppy().
You can use (sizeof(array)/sizeof(array[0])) or the _countof() macro.
gmileka
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I am using Visual Studio C++.NET
I am familiar with creating dialog applications. But i want to include menus
However, i would like to create a windows application with menu options, file etc.. and at the same time, include controls like buttons drop down boxes, picture control area. Can anyone direct me to a good tutorial or if you can explain some basic steps i'd be grateful... I know that it should be easy, i just don't know where to start...
Thanks,
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LCI wrote: ...at the same time, include controls like buttons drop down boxes, picture control area.
In the menu, or the client area?
"The largest fire starts but with the smallest spark." - David Crow
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Well, in the client area. I suspect that if i create an MFC Single or multiple document application, i will get the menu. But if i do that. Now i have a menu, but i want to be able to add controls and buttons in the client area just like i would in a dialog based application.
Do you recommend me generating the project as a win32 project?
I am currently creating projects of different types just to see if i can get a feel for doing the above but cannot seem to figure it out.
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LCI wrote: Well, in the client area.
Then just derive the view from CFormView.
"The largest fire starts but with the smallest spark." - David Crow
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