General C++ Programming - C++ Forum - October 2010 (Page 17)

Write and test program that solves quadratic equations.A quadratic equation is an equation of the form ax² + bx + c where a,b and c are given coefficients and ...

[1 reply] : This really isn't hard to create. Try it yourself. If you don't succee... (by Kyon)

by carlsum1986

regular expressions

How do I validate the users inputs. I want to validate to ensure that the user is entering numbers and commas only. I need this to validate a phone number in ...

[6 replies] Last: i have seen this and does not cater to my , in between the numbers tha... (by carlsum1986)

by geek4u

Memory Management

how will u know if memory is available before using new operator? any mechanism

[9 replies] Last: Thanks. That's what I get for using a 12 yo textbook. It used to wor... (by closed account D80DSL3A)

by kfmfe04

Are automatic char arrays expensive any more?

In the olden C days, code like this was deemed expensive: void foo1() { char str ; // allocated on the stack each time foo1() is called } So a bett...

[9 replies] Last: Excellent. TYVM, jsmith - that info's exactly what I was looking for. (by kfmfe04)

by levone

warning: deprecated conversion from string constant to 'char*'|

Images typdef typedef std::map<char*, SDL_Surface*> Images; Code in question. bool LoadResources(Images& images) { images["chess_board"] = IMG_Loa...

[5 replies] Last: It is likely that if you have more than one .cpp file that accesses th... (by jsmith)

by TiaSorella

switch and visibility (1,2)

Hi@all I use switch to create a template class at runtime but once the switch is finished the class is no longer available (the pointer is destructed). ...

[24 replies] Last: IT WORKS!!! I had to use AbsFiguraT<K> * tmp_fig = dynamic_cast... (by TiaSorella)

by LittleQuick

Unknown Error?

I do not know exactly what this error is trying to tell me. Am I missing a #include or something? If you know what it is talking about please give me a heads up...

[2 replies] Last: I see! Thank you so much! forgot the extra parenthesis. (by LittleQuick)

by matt295

removing duplicates from union, intersection, and difference functions

I am almost finished with this programming I am working on but I am having one problem with a segment of my code. I can not get rid of the duplicates for the f...

[2 replies] Last: C++ already provides the algorithms for dealing with sets. Go to this... (by kempofighter)

by freddie1

C++ Templates And C++ Preprocessor

I thought I might be able to see how class templates actually expand by using the /E or /P command line switches with the Microsoft cl compiler and compiling on...

[2 replies] Last: Thanks R0mai for the info. That's about what I figured. I thought it... (by freddie1)

by luckycusp

To obtain Line from a square grid

I need to find all the squares in the grid which include a part of the line drawn in a grid. Infact I found what I need to do exactly in the below link. http...

[1 reply] : for (m=dy/dx, y=y1, t=round(x1); t<=x2; t++, y+=m) glVertex2i(t... (by ne555)

by jonjondavid

how can i group the names into three group using 2D arrays??

pls help me about my problem.. i dont know how to group the names into three group.. pls help me. according to my teacher we will use the 2D arays but i dont k...

[no replies]

by jonjondavid

how can i group the names into three group using 2D arrays??

pls help me about my problem.. i dont know how to group the names into three group.. pls help me. according to my teacher we will use the 2D arays but i dont k...

[no replies]

by fukki

Char & string problem after space..

I try both char and string to store 2 words, for example "my dog". The program after display only "my" and the rest after the space are gone. Whats wron...

[5 replies] Last: I found the solution. I just put cin.ignore(); before the getli... (by fukki)

by unregistered

concurrent access to sqlite

For concurrent access to a single sqlite database, do I still need to use a mutex lock on the handle to the database( sqlite3 * ) for each thread since sqlite i...

[3 replies] Last: http://www.sqlite.org/lockingv3.html try this link (the same thing ... (by Thenero)

by DLNOOP

Convert array to text

I am using MS Visual Studio 2008. This is a CLR Windows Forms Application. I have an array; array<DriveInfo^>^ DI = DriveInfo::GetDrives(); I want to take...

[no replies]

by shadowayex

C find files in a directory.

I was wondering if there was a way in Standard C to get the names of all the files from a certain directory. Something like the glob() function from PHP, if you...

[1 reply] : http://www.cplusplus.com/forum/beginner/21043/#msg110215 (by kbw)

by Ana Developer

Compiling Error in Overloaded Operator =

Dear all, I have my Node class: #include <string> #include <set> class Node{ private: std::string label; int ID; public: std:...

[10 replies] Last: I added body to the destructor, and voila! Its working! You are a geni... (by Ana Developer)

by karthick88

A template Member inside a non templated class?

Hey geeks, why is it not possible in C++ to have a virutal template member function in a non templated class? something like the following c...

[1 reply] : You can't have virtual template functions in any class period. The ... (by jsmith)

by exiledAussie

Exceptions, from a higher view

OK... Can someone justify common exception usage? I have come into programming from mathematics for almost a year now and feel like I am hitting my stride. ...

[9 replies] Last: What I said above, which is mostly what Sutter and Alexandrescu say in... (by jsmith)

by closed account 3hM2Nwbp

(Almost Complete?) Database Connection Pool

I fell in love with the C++0x lambdas with this one after trying for a while to find an elegant pool pruning method. The connection acquisition happens in a re...

[1 reply] : Hi Luc, it would be good if you intend to carry your database connecti... (by sohguanh)

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General C++ Programming - October 2010 (Page 17)