General C++ Programming - C++ Forum

Output File smaller than Input file?

What im doing is loading a file in to an array, and simply writing that array to another file. When I do this, the size is different, and the file no longer w...

[1 reply] : Don't forget to open with ios :: binary . (by Duthomhas)

by majidkamali1370

Copy

hello. How can i copy a file? Is it depends on the format of file? thanks :)

[1 reply] : Via C++? Just store all the data to a bitset in your program, and read... (by Albatross)

by marembo

CCTV video streaming

guys, i want to know all of the following: -How do i read video data from cctv cameras -What do i need to know to program a program that reads data from the c...

[1 reply] : http://stackoverflow.com/questions/37956/c-whats-the-easiest-library-t... (by cnoeval)

by DarkDragon1993

Copy const char* to char*

Hello again, I'm a bit confused... I have a std::string szLine which reads in a line of a document. I don't want to directly modify this line, so I create a te...

[1 reply] : dynamic memory allocation! std::string szLine; while( true ) { ... (by m4ster r0shi)

by srlcay47

can't complie and run..

//Exercise P11.10, sort a vector of Employee objects by salary using the standard C++ sort function. #include <iostream> #include <string> #include <vector...

[3 replies] Last: I hope this helps. #include <iostream> #include <string> #incl... (by blackcoder41)

by mmahmoudieh

Access to controls in child dialogs

Hello everybody ! With vs2008 – Smart Device – MFC – dlg I have a project named Test1 : 1- a Tab Control in class Test1 and a variable m_tbCtrl adde...

[no replies]

by browjs

factoriadic number calculator problems

hi guys im quite new to C++, so there is probably lots wrong with this programme. im really having alot of trouble getting it to work. ive made a function for f...

[3 replies] Last: right now all i am using main for is to enter in a number and then it ... (by browjs)

by sunilk

initializing static variable conditionally

Hi, I would like to know how to initialize a static variable conditionally. if(flag == true) { static int jk = 4; } else { static in...

[3 replies] Last: (However keep in mind that statics are initialized only once no matter... (by jsmith)

by eonerf

Alphabetically Ordered Binary Tree Word Count Problem

I'm making a binary tree which analyses a text file and counts the frequency of the words from that text file. The problem I have is that I can't seem to increm...

[1 reply] : Although your addNode() function handles the case where the word to be... (by jsmith)

by C 123456789

vertical axis on graph

Hi all this is my code, i am able to get the horizotal axis correctly, but i am unable to get the horizontal axis correct. i need some help plz. this is how th...

[1 reply] : please edit your post and put [ code ] (without spaces) before and b... (by imi)

by mrkcc

Programming grapih

graphic c + +, which is not borlan graphics.h, I need good libraries is that I can use to start programming spreadsheet, like Excel, but only with the basic ope...

[2 replies] Last: If you mean you want to easy draw diagrams out of some raw data, then ... (by imi)

by tomob57

Vector of derived classes

Hi, hopefully someone can help me here. I have three classes derived from an abstract base class, and I want a single vector to hold objects of each of the t...

[2 replies] Last: Zhuge is right: you can't use direct copies of your base class. Bu... (by imi)

by rachitagrawal

Semaphores

I am getting a strange problem. I have 3 files, 1. Semaphore.h - Header file 2. Semaphore.cpp - Implementation 3. main.cpp - To test the implementation. ...

[3 replies] Last: Was missing sem_op = -1 in getLock(); Its working fine now. :) Than... (by rachitagrawal)

by vihrao

binary '+' : no operator found which takes a right-hand operand

I am trying to use operator+ overloading to add to matrices classes. It is on the line rslt = m1+m2 where rslt, m1, m2 are alll matrix classes. Here is the cod...

[3 replies] Last: Yes, OK, I see where I misread it. Your matrix should look somethin... (by Duthomhas)

by kirillpushkin

Arrays

Hi, I am a C++ learner , therefore, please do not judge me very much for not handling such a simple problem. I am trying to write a code (playing), which con...

[8 replies] Last: Cnoeval, wow, it is a simple as only possible! (by kirillpushkin)

by pbhushan2020

pointers :significance of * sign

void main() { char s ="string"; char *sp=s; while(*sp!='\0') { cout<<*sp; sp++; } } SHOWS ME: string but if i replace cout<<*sp wi...

[2 replies] Last: When you use *sp, cout prints content of pointer's actual position. Wh... (by mtweeman)

by rootsline1

Program about Complex numbers.

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[10 replies] Last: If you're still needing help on this topic I suggest you stop erasing ... (by cnoeval)

by Dlockwood

Dynamic object

I am creating a student object and want to call my constructor using a loop here is my code can anyone tell me what i am doing wrong. I want the loop to run an...

[8 replies] Last: "That looks to me like a double initialization. Why are you reinitiali... (by Dlockwood)

by aidyszh

Is there any difference between Windows and MAC to use dynamic_cast?

There are two class like A and B: class A { public: virtual ~A(){} }; class B: public A { public: B(); virtual ~B(); } //..../...

[no replies]

by soujanya

how to check whether a file exists or not

my application is present in a folder called file which contains user interface, header files and .cpp files kindly suggest me how to check whether any file ex...

[5 replies] Last: Boost.Filesystem has an exists predicate: http://www.boost.org/doc/li... (by moorecm)

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General C++ Programming - May 2010 (Page 18)