51,593 Topics
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| | I am reading a file that is about 20 Mb, this will take about 10 seconds. A few lines from this file look like below. The first value is a date value that go from lower to higher and the second value after the "Comma" is a number. In the … |
 | hey, is this code: [CODE=C++]if(m_velocity.x == 0) return 0; return ToDegrees(atan(m_velocity.y/m_velocity.x));[/CODE] any more efficient than this code: [CODE] if(m_velocity.x == 0) return 0; else return ToDegrees(atan(m_velocity.y/m_velocity.x));[/CODE] I.e., are we saving any time by omitting the else statement?  |
| | In Xp... I want to access start->run through programatically like when click start ->run-> //192.168.23.5 how i access this run through c??? |
| | my string contain "hello baby" and i wanted to find the position of the character 'l' which falls in pos 2 and 3. Using string.find("l") return me the position of first "l" found. How can i do a loop to find the position of my next character 'l' in the …  |
| | How can i cut out every 4 characters from a text file? Example: my text file rows of binary numbers like: 101010101000010101010111 i wanted to cut out every 4 characters from it becomes: 1010 1010 1000 0101 .... .... ..... i have been bale to cut out the 4 characters … |
| | Hi, I just bought a hp laptop installed with Vista business and I hava installed in it Microsoft Visual C++ 6.0. Initially, I was able to write programs with it but it could not execute the programs. Now, I am even faced with a bigger problem, it cannot open a …  |
 | Hey, I made i looked up toupper and made a little program out of it and have come to a little situation, When i enter the space character " " it does not output what i want and it just closes. [CODE=C++]#include <iostream> using namespace std; int main() { int … |
| | Hi people. I was just wondering if I can use _LINE_( by including some header file or so) in devc++ to get the source code line number or _TIMESTAMP_ to get the compile time timestamp. If not is there an alternative? I see compile time errors when I use them … |
 | Hi, I'm trying to update a file with an information in a binary tree. However my algorithm is working only for one NODE. Any suggestion will be appreciated! [CODE]void Arbol::updateFile() { Nodeptr p = miArbol; // myTree Recorrer(p); cout << "File updated!" << endl; cout << endl; } void Arbol::Recorrer(Nodeptr … |
| | Hi, I wish to delete the first 3 lines from a file. Following is my code which goes into an infifnte loop. [code=cplusplus] int main() { vector<string> text_file; fstream fout; int count = 1; fout.open("tempfile.txt"); assert(!fout.fail()); string temp; while(!fout.eof()) { if(count <= 3) { getline(fout,temp); count++; } if(count > 3) … |
| | i got my code to finally compile but, now im getting 5 linker errors that i have no idea why im throwing them the errors are: [code=cpp] football.obj : error LNK2019: unresolved external symbol "public: void __thiscall Football::SearchMatches(struct Match * * const,int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,int)" (?SearchMatches@Football@@QAEXQAPAUMatch@@HV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@H@Z) referenced in function … |
| | Hi All, Quick question... I have a structure for a specific type of vector: struct SParticle { float Position; float Velocity; float FcnVal; float LocalBest; float LocalBestVal; } But now I need to define 30 objects for this structure. Is there an easy way for doing this or should I … |
| | Hey everyone. I've been working on a homework assignment to simulate a weather station responsible for recording hourly temps and reporting an average temp. I'm supposed to be passing an array to different functions to first get the temps and input them into the array. Then, compute the average temp … |
| | I am working on porting C++ code to Delphi and I am only having a problem with the correct conversion of memmove() statements in the C++ code. If you or any one you know could help me to convert this C++ code to Delphi I would be thankful. // Move …  |
| | Write a C++ program that prints the attendance sheet of students in a class ordered by either their names or by their ID’s. The instructor will enter the number of students in the class; the students’ names [First Last] and their ID’s which will be entered as integers, and then … |
| | Given all that I hear about the problems with global variables, is it possible to declare a windows CRITICAL_SECTION object as a member of a base class that will not be created for each derived class? I want to implement an instance counter that is threadsafe, so I thought about … |
| | [code=cplusplus] //I have a problem, i trying to get the total prime numbers for each row on the output. //I jus getting the total prime numbers from the firs line 1 to 100 // my task is to get the total prime number from 1 to 100, 1001 to 2000.....49001 …  |
| | hi i am trying to make a function for calculating the commercial boat fee, so if a boat is commercial, the program will add additional fee to the total sum, and if its not it won't add anything to it. i got the function to run, but all i am … |
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| | Hey everyone, I'm trying to make a C++ program that inputs data into a web page. For example make a program that takes an input and enters it on the google search box and presses the enter button for you! Can anyone help me? Any codes or ideas where to … |
| | well my struct is fix but i have new errors i hve never seen before : here are the errors [code=cpp] football.cpp(194) : error C2664: 'void Football::SearchMatches(Match *,int,std::string)' : cannot convert parameter 1 from 'Match *[2000]' to 'Match *' football.cpp(205) : error C2664: 'void Football::SearchMatches(Match *,int,std::string,int)' : cannot convert parameter … |
| | I'm trying to work out what should be a simple composition example. For some reason I can't compile this project though. I get three errors when I try to compile. Errors listed below. Where am I going wrong? 1>c:\documents and settings\user\my documents\visual studio 2008\projects\name\name\ssn.h(5) : error C2011: 'SSN' : 'class' … |
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| | I am readin a .txt file Line for Line and what I am interested to do is to identify that if the Line do contains any characters as Letters, text, symbols. Exceptions is things like: '\n' ' ' etc... so "" wont be possible here ? So I am trying … |
| | Our application was ported from UNIX to Linux(x86) and we are using Red Hat Linux. I have hit a problem with Rogue Wave libraries and would appreciate any help. RWTPtrSlistIterator is being used to iterate a list which has RWTPtrSlist in them. The code flow goes something like CaUpdateSetIterator updateIter(( … |
| | HI First I apologiz ‎ about my bad language Be cuz my language is not English I have this problem in my project code And I try to solve it but I cannot This is in the part of main [CODE]int main () { Queue<primaryPatient> primaryQueue;//create object from class Queue … |
| | Hi, I wish to do the following things: a) Append the first three lines from the file "file1.txt" at the end of another file "file2.txt" b) Run a program "prog1.cpp" which uses the file file2.txt. c) Delete the three lines appended at the end of the file "file2.txt". and append … |
| | // Size of the encrypted buffer should be void XOREncrypt (unsigned char* buffer, unsigned long length, unsigned char* key) { for (unsigned i = 0; i < length/8; ++i) for (unsigned j = 0; j < 8; ++j) buffer[i*8 + j] = buffer[i*8 + j]^key[j]; } // Calculate padding padding … |
| | typedef struct iphdr { u_char ip_hl:4, /* header length */ ip_v:4; /* version */ u_char ip_tos; /* type of service */ short ip_len; /* total length */ u_short ip_id; /* identification */ short ip_off; /* fragment offset field */ #define IP_DF 0x4000 /* dont fragment flag */ #define IP_MF 0x2000 … |
| | Hi everyone, So my first post wasn't clear... I want to make a C++ program that takes input from an excel file and puts it on a website and submits it for you. I say this bkz at my job i have to do this... I've seen a C++ program … |
| | I have some questions, some might seem kind of dumb, but we're studying overloading operators and inheritance/polymorphing. I'm having trouble finding some references on some things to show me how to do this stuff or why I'm doing it a certain way. what kind/type of binary operators can I use … |
| | Please tell me how to read integer value from file using c++ classes. |
| | hey :) i have this piece of code: [code] while(!(std::cin >> input) || input < 1 || input > 100){ std::cout << "not valid, try again: "; } [/code] it should allow the user only to be able to write numbers between 1 and 100 (input is a short int), … |
| | Hi all I am learning C++ , but am still pretty new to it I have one problem I am writing a program to simply input a mark and then it gives the corresponding symbol and according to the symbol if its anything above an E it displays you pass …  |
| | Hi guys, I have written a program to read streaming GPS data from a GPS usb device. I am using CreateFile() and all seems to be all right except for time synchronization. The Usb device, once connected, will continuously stream GPS data. No initialization is required, i.e. even using Hyperterminal, … |
| | Is it possible that server sends one exe to clients and execute that exe on client machines And get information back to server. No manually execution of that exe on client machine It is automatically through server only.... Is it possible through programmatically and HOW...which concept use for this like … |
| | #include <iostream> #include <fstream> #include "Teacher.h" using namespace std;// syntax error : missing ';' before 'PCH creation point' teacher::teacher(int tid,int cid,char *teachname) { this->tid=tid; this->cid=cid; strcpy(this->teachname,teachname); } void teacher::setTeacherId(int tid){this->tid=tid;} int teacher::getTeacherId(){return tid;} void teacher::setCourseId(int cid){this->cid=cid;} int teacher::getCourseId(){return cid;} void teacher::setTeacherName(char *teachname){strcpy(this->teachname,teachname);} void teacher::getTeacherName(char *teachname){strcpy(teachname,this->teachname);} |
 | I have x and y array...After I have sort y, it succefully sort the y. but for x, there is some number that are not sort like this [B][U]x y[/U][/B]30 1 45 1 46 1 15 1 I want the x sorting also...like this [B][U]x y[/U][/B]30 1 15 1 30 … |
| | When I run the follwing code: [code] #include <iostream.h> #include <string.h> #include <vector.h> #include <fstream.h> using std::string; using std::vector; void exchange(vector <int> &array,vector<string>&array1); void main() { ifstream fin,f2,f3,f4; //First name input vector <string> fname(25); fin.open("firstname.dat", ios :: in); for( int i= 0;i<25;i++) fin>>fname[i]; fin.close(); //Second name input vector <int> fnum(25); … |
| | ok i have wrote this program and been trying to break into a class called football , but i keep getting an: error error C2228: left of '.Season' must have class/struct/union i have tried moving my stuct around in and out of the class but im not sure how to … |
| | Amateur c++ student here who has gotten to the point where I'm comfortable with classes somewhat, however I'm a bit obsessive compulsive. I've been learning by just continually adding to a program, however it's all in my main.cpp. I use visual studio 2005, and would like to take certain classes … |
| | I am replacing 2 words in a textBox with this code. What happens is that the code scans the textBox and finds 2 words: "one" and "onefour". These two words [B]should [/B]be replaced with: [B]onefour[Calculate][Calculate2] one[Calculate][Calculate2][/B] But instead the replacement will look like below. I know why it happens because … |
 | I am very much a part time user of C++ to solve particular problems and therefore a bit of a greenhorn - I am having some issues with where files are stored. When I first start up my application the path appears to be the directory where the .exe is … |
| | function is x/y+z means (x/y)+z if you dont write to Z anything program says "ERROR: Operator-operand imbalance." program is that as it is above and my code is [ICODE]#include <iostream> using namespace std; class Calculator { int x,y,z; public: void arith_ex(int,int,int); }; void Calculator::arith_ex(int x,int y,int z) { cout<<"X="<<endl; cin>>x; … |
| | Hi,everybody I am a beginner in c++;Could you please tell me how to change an iteration program to a recursive one and vice versa?It will be greatly appreciated if you could show me with the help of a few examples(programs). |
| | Hi everyone, I'm having some trouble with my computer lately. When my computer boots, i want a lot of programs to load, half of them normally makes a tray icon, but my computer is so slow, the tray icons won't be created. So I've found a way to work around … |
| | [CODE=c++] #include <iostream> using namespace std; //----------------------------------------------------------------------------- void UserMove(int &NumStones) /* Pre: NumStones > 0 Post: User has taken 1, 2, or 3 stones from pile */ { cout << "How many would you like? "; int TakeStones; cin >> TakeStones; while (TakeStones<1 || TakeStones>3 || TakeStones>NumStones) { cout << … |
| | Just wondering how do you create a queue system using pthread? I need to create 2 thread, one for putting in the queue number into an array and the other for removing the queue number from the array. |
 | can anyone help me convert this to c++?? <?php function show_me($info) { $arr = array('fruit' => 'apple', 'car' => 'bmw'); return $arr[$info]; } echo show_me('fruit'); //or echo show_me('car') ?> |
| | I have seen so many classes and inheritance programs but what I cant seem to know is when and why do u end up resorting in this statement [ICODE]#include "NameOfTheClass_h.h"[/ICODE] and I guessed that is when u have separated the class from class main(), that sounds like making your program … |
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