49,766 Topics
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| | The combinations function C(n, k) is usually defined in terms of factorials, as follows: C(n, k) = n!/(k!*(n-k)!) The values of C(n, k) also leads to the Pascal Triangle: C(0, 0) C(1, 0) C(1, 1) C(2, 0) C(2, 1) C(2, 2) C(3, 0) C(3, 1) C(3, 2) C(3, 3) C(4, …  |
| | If RGB(170,255,213) gives a pastel green color display then what is the color code I should use if I want a deeper green color tone display? Is there a list of the color display codes for C++? or where I can lookup for sample color displays? ;)  |
| | I am writing a program where one part of the program gets some data while the other part gives in new data at intervals for the first part to work on. This two tasks are to be done independent of each other and concurrently. The time one part stops does …  |
| | Here is the full code relating to my performance problem I’m having with my operator+= which I described in this adjacent thread…. [url]http://www.daniweb.com/forums/thread340734.html[/url] As a quick review, I’m finding that the operator+= function in the Standard C++ Library’s String Class, i.e., <string>, is performing almost impossibly fast compared to the … |
| | Hi all, I'm facing strange error. I defined a class: [CODE] class MyClass : public MyAbstractClass { public: MyClass() : myList(myList) {} ~MyClass() {} void AddList(list<MyObject>& myNewList) { myList = myNewList; } private: list<MyObject>& myList; }; [/CODE] And in the main I do: [CODE] // myObject is initialized here and …  |
 | Can someone [B]please[/B] provide some insight on this: [code=c++] int get_smtp_line( void ) { char ch = '.'; char in_data [255]; char * index; int retval = 0; index = in_data; while (ch != '\n') { if ( (retval = gensock_getchar (SMTPSock, 0, &ch) ) ) { gensock_error ("gensock_getchar", retval); … |
| | Hi, I have a big project (#1). this is its direction: Project I Software for a Bank Write a C++ program for the following task: a) Should allow 5 users with user name & password [ (Ohlone1, Ohlone1pw), (Ohlone2, Ohlone2pw),( Ohlone3, Ohlone3pw), (Ohlone4, Ohlone4pw), (Ohlone5, Ohlone5pw)] b) Display a welcome … |
| | Ok, I have asked this b4, and I don't think I have gotten a straight forward answer, I really need this answered, because what I am doing is "legal", but i am 100% it does not make logical sense. This it the original C# code [CODE] var version = reader.ReadUInt32(); … |
| | Hi all, I'd like to open a file dialog using win32 project ...I need a simple code example that uses FileOpen...I used <commdlg.h> ...::GetOpenFileName or ::GetSaveFileName but i can't get them to work :S ... Thanks in Advance, |
| | Hi another exercise which im having problems with. In this challenge im given a four digit integer and encrypt each digit as follows. Replace each digit by the sum of that digit plus seven mod 10. Then swap 1st and 3rd digit places and 2nd with 4th. Heres what i … |
| | hii, this is my .h ,file : [CODE] /* * sortedlist.h * * Created on: Jan 16, 2011 * Author: saeed hardan */ #ifndef SORTEDLIST_H_ #define SORTEDLIST_H_ #include <iostream> #include <functional> namespace mtm { template< typename T, typename Compare = std::less<T> > class SortedList { private: struct ListNode { ListNode … |
| | Hello I have a problem with reading the coordinates of points which are extracted from (..txt ) file.I have read the file with ifstream but I don't know how to use the information then. Thanks in advance the point are in File as followed : u:1.2000 v:4.5400 u:2.5450 v:6.4500  |
| | I have a program that accepts multiple lines of strings for a variable and accepts another set of multiple strings for the next set of variables, and so on, each seperated by a free line i.e.\n\n How do I write such a program? |
| | [CODE]bool is_prime(int a) { if(a==1){return false;} if(a<4){return true;} if(a%2==0){return false;} if(a<9){return true;} if(a%3==0){return false;} int i; for(i=5;(i*i)<=a;i+=6) { if(a%i==0){return false;} if(a%(i+2)==0){return false;} } return true; } [/CODE] critique welcome. |
| | main.cpp [CODE] #include "includes.h" #include "LOGMSGs.h" int main() { LOGMSG("TEST"); getch(); return 0; } [/CODE] MYSQLcon.cpp [CODE] #include "LOGMSGs.h" int Mysql() { MYSQL *con, mysql; mysql_init(&mysql); const char * host="localhost"; const char * user="test"; const char * pass="test"; const char * db="NewServer"; con = mysql_real_connect(&mysql,host,user,pass,db,NULL,NULL,NULL); if (con == NULL) { … |
| | i am a student and i use turbo c 3.0 and 4.5 its compulsory for the computer programming course but there is one error i get when try to run a code having graphics.h on 4.5 that BGI graphics not supported under windows but the same code runs fine on …  |
| | Good evening. I've recently had an assignment to create a doubly linked list that is self contained. This means that the entire list is contained in a single class - the class acts as both the list and the node. I've completed everything and have gotten to my final task … |
| | logmsg.h [CODE] void LOGMSG(string logmsg,...)//... { stringstream name; name<<"test "<<TM.years()<<"-"<<TM.month()<<"-"<<TM.day()<<".log"; ofstream log; log.open(name.str(), ios::out | ios::app); log <<TM.hour()<<":"<<TM.mint()<<":"<<TM.sec()<<" Message: "<< logmsg<<endl; } [/CODE] main.cpp [CODE] int main() { int a = 100; LOGMSG("type test!!",a,"times"); }[/CODE] but it's only wtite into the file "type test!!" while i want it to type … |
| | I'm quite new to the standard template library, I'm trying to understand how to use them with my code. There may still be some logic errors in my code. However I am trying to sort out my syntax errors. One big one is this: type/value mismatch at argument 1 in … |
 | Hi there, it's been awhile :$ I have just completed a small easy exercise which was to create an Account class, providing a constructor to receive the initial account balance, add some money to the initial balance and withdraw some money (providing that the amount of money to withdraw is … |
| | Hello Vivayan! Its taken me this long to understand your sophisticated program you gave me using STL (Standard Template Library) iterators, container classes, algorithms, and the works! I’m truly grateful for the time you took to develop this program for me, and it inspired me so much I’ve decided to … |
| | I have been doing a lot of reading online about memory stream types, and I am trying to avoid using the gcnew MemoryStream() from the System header in this program. Here is an example of what I need to be able to use it for. [CODE]var reader = new BinaryReader(new … |
| | [QUOTE]You said the function returns just a single character yet you are trying to return a character array. You can't have it both ways. What you should have done is [icode]char* getEmpName()const[/icode] -- notice there is a * after char to indicate it will return an array of characters.[/QUOTE] Hi, … |
| | I am having a mental block with this LINQ expression and cannot seem to figure out how I need to convert it to C++. [CODE](var item in inTables.SelectMany(table => table.Items))[/CODE] This code applies to the following piece of code [CODE] foreach (var item in inTables.SelectMany(table => table.Items)) { Trace.Assert(oldDrs.Position == … |
| | Hey guys, This is only my second thread on DaniWeb and I am a beginner programmer. My code looks like this: (really easy to understand and shouldn't need any further explanation besides the fact that I need help understanding why when i give an answer related to the 'else' loop, …  |
| | I don’t know why my operator += and operator + string class member functions are taking so long to do their job and are so inefficient compared to the Standard C++ Library String Class. Its not that they don’t work; its just that they are slower by a factor of … |
| | Hi, The program below takes input from user the marks of 10 students in 6 subjects and gives output as: [output] Maths Phy Chem Bio C.Sc Eng Tot Stud_Avg studentname1 10 20 30 40 50 60 210 35 studentname2 20 30 40 50 60 70 270 45 -- -- studentname10 … |
| | I tried many codes in internet for this but it says Access violation. Can somebody provide me the code snippets in C++ and C# for this?  |
| | beth = ted; // beth equal to ted ( 1776 ) beth = *ted; // beth equal to value pointed by ted ( 25 ) [B]beth = &ted; // is this statement result in a compiler error? if beth is an int variable[/B]  |
 | Hi, I am in need of a good reference for C++/CLI. Right now I need to know how to exit the main loop of a form, such as if the user clicked the 'X' at the top right. Nevermind, the function Close() is what I needed. |
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