51,593 Topics
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 | Hey Everyone, I have run into a bit of a problem with regards to application startup... I have written a C++ application with QT libraries that uses active QT to communicate with our ERP system in our business, the requirements are that any application we use needs to communicate its …  |
 | I'M trying to compile a very small cout<< console application in MSC C++ but the program flashes up and goes away so quick that I can't see anything that's going on. Below are my headings, what's missing? Thanks. #include <Stdafx.h> #include <iostream> using namespace std;  |
| | I have been researching ways to make a DOS window disappear when starting a program. I have solved this, by using getconsolewindow() and setwindow(). The thing is, I still get a blip where the DOS appears for a couple miliseconds. Is there a way to fix that? Clip of code: … |
| | I'm having some trouble making my snake move :D I can move one point in any direction but the whole body of the snake is where I'm confused , if(a == (char) 119 || a == (char) 87 || a == 72) { y=y--; gotoxy(x,y); PrintVector(v); } thats works just … |
| | Hi I am getting this error when running a very similar code like the below. I have memory problem,but i dont know how can solve it. please help. Thanks in advance. /////////////////////////////////////////// ~~~~~~~ERROR~~~~~~~~ terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc Aborted /////////////////////////////////////////// ~~~~~~~~Code~~~~~~~~~ int main(){ /** Declare … |
 | please help me coding this in c++: Inverse matrices. Calculate matrix determinant. Set a row or a column of the matrix to a certain value. Calculate performance (time and memory taken by each algorithm). |
| | i have read a txt file into queue just like below example which is i can do it.. the problem is i how to read Tab Delimited Files which i want file size to multiple by 0.6... because i want to create handle a printer simulation using queue...sorry for my … |
| | I have read a file with around 120k words so i try to do it fast. have seen the: int x = setvbuf(fp, (char *)NULL, _IOFBF, BSZ); assert( x == 0 && fp != NULL ); option but it takes more than a second ( 1 mb file) so now … |
 | In Python: #python class myClass: istat = 111 #exists as soon as import class def __init__(self): print("in ctor") self.iauto = 222 #does not exist until instance created ..... mc1 = myClass() mc2 = myClass() In C++: //C++ class myClass { public: static int istat; int iauto; }; ..... //main myClass …  |
| | I cant display this output..how i can i declare the gender n relate it with my price..i stuck here..oop c++ i have 2 coding for this..which 1 is better..im new in this progrmmer.. void eSalon::priceCurling() { cout<<"\nYour Gender is: "<<gender; if (gender=female) { cout<<"Long Hair Rm30-RM49"<<endl; cout<<"Short Hair RM50-RM100"<<endl; } …  |
| | Hi all, I have to make a project on my School until 18th of May. I am using resEdit to make graphics for a c++ program. But there ara a lot of cases that the program crashes. Could you help me ? I don't know to use resEdit good so … |
| | I am using visual studio 2010. I wanted to compile my cpp from cmd. I can compile it using "cl file.cpp" comand in visual studio developer command line tool. But I wanted to compile it from the built in cmd of windows. When I try to use the command "cl … |
 | I am familiar with loops, functions, recursions, (though I have praticed some questions, it is troubling to get the hang of it completely), passing by value, reference and ofcourse pointers. I can work with arrays and 2d arrays. This is my second project. My first project was hangman. My sir … |
| | Please Help!!! My understanding of getopt is very limited. I do however realise that argv[0] is the exe file, argv[1] is the option, argv[2] is the word to compare and argv[3] is the dictionary or document I want to search(file .txt). I'm trying to set a pointer to the dictionary … |
| | Hello all. I have come to the conclusion that when i try to use images for backgrounds in my windows forms, these images have to be exactly the same size as the form or else when i move the form it will cause the form to shake. The problem with … |
| | I want to start developing an IDE or at least a Syntax highlighter into my program. Atm it's a simple text editor with basic copy paste functions. How does Notepad++ do it? Is there a way I can integrate that into my own program? If not then I'll write it …  |
 | #ifndef FILM_H #define FILM_H #include <QString> class Film { protected: QString title; double dailyRate; public: Film(QString ti,double dr); QString getTitle() const; virtual double calculateRental(int num)const; }; class Video: public Film { public: Video(QString ti,double dr,QString vt,int d); QString getTitle() const; QString getVideoType() const; virtual double calculateRental(int num)const; protected: QString videoType; … |
 | have fun with this game o' keno! post here with your highest winnings |
 | I used to use a tutorial for windows console API, but the website was taken down :(. So now I need to ask how to do these things (which ALL were included on the website) in the console with windows API: * Mouse events (clicks and unclicks) * Cursor seeking … |
| | Please write a program that will asks to give an integer number K that will be higher than 20. If the number is not higher than 20 then make the program to show a relevant message and then ask to insert again the number K. After that, depending on the … |
| | Write a program for an application that does not tolerate erroneous input data. Therefore, the data values are prepared by entering them twice by the user. Two lists are made by getting positive integers from the user, separated by a negative number. These two lists of numbers should be identical; …  |
| | I just downloaded netbeans and when I went to start a C++ project I was told that Netbeans couldn't find a C++ compiler. When I use to play around witt MS Visual C++ I never ran into a problem like this, Can anyone tell me what's up and what I … |
 | please am new into programming and i was given a project to create a premier league table using C can any 1 help me thanks a lot  |
| | Hi ive made a code does the following: 1. user makes a list of items 2. user adds more items to the list 3. list is displayed it uses Linked-Lists. here is the code #include <iostream> using namespace std; struct vote { char product[10]; vote *votePtr; }; void addNodes(vote *&startPtr,vote … |
| | I have a C++ console project in Code::Blocks and I have set breakpoints to test an error. I have set the build for the project to produce debugging symbols for the debug build. I built it, then when I hit debug it just ignored my breakpoints and skipped to the … |
| | Hi, I'm trying to write a function that enlarges a dynamically allocated array, but I am having some trouble doing so. Here's my code: void enlargeArray(int *oldArr, int arraySize) { //oldArr is a dynamically allocated array int *newArr = new int[arraySize*2]; //copy the elements from oldArr into newArr delete oldArr[]; … |
| | Hi, I am trying to create a programe like this: n1 = NAttrib() n2 = NAttrib() out = NAttrib() NAttrib class can be considered as general purpose attribute. f1 = FloatAttrib(1.0) f2 = FloatAttrib(2.0) FloatAttribute class is like float type but with some extra spices. It has operator overloading functions … |
| | //PROGRAM TO FIND DERIVATIVE(FIRST AND SECOND)OF POLYNOMIAL FUNCTIONS #include<iostream.h> #include<conio.h> void main() { int i,d,coeff[100],degree[100]; clrscr(); cout<<"\nEnter the degree of the polynomial : "; cin>>d; for(i=d;i>=0;i--) { if(i>1) { degree[i]=i; cout<<"\nEnter the coefficient of x^"<<degree[i]<<" (with sign) : "; cin>>coeff[i]; } else if(i==1) { degree[i]=i; cout<<"\nEnter the coefficient of x … |
| | matrix operation please help me coding this in c++: - Inverse matrices. - Calculate matrix determinant. - Set a row or a column of the matrix to a certain value. - Calculate performance (time and memory taken by each algorithm). |
| | hi im currently learning about linked list. Ive created a code which is supposed to let you type some numbers, then display them. i did this mostly by using information on the internet(code examples) and such. Hence there are obvious mistakes a bits i do not understand. Here is my … |
| | Hello, I'm working on an assignment that requires me to do the following: "A file contains 6 numbers per line and contains several records. Another file contains 3 numbers per line and several records. Write a program to input each of the numbers, find the highest number, the lowest number, …  |
| | #include <string> #include <cstdlib> typedef enum {Dominion, Sobeys, Shoppers, Walmart} Store; using namespace std; class Item { private: // name of the item (non-empty string) string name; // number of dollars in price of item int dollars; // number of cents in price of item int cents; // store where … |
| | //TO FIND INVERSE OF A MATRIX #include<iostream.h> #include<conio.h> #include<math.h> #include<graphics.h> #include<iomanip.h> float A[3][3],B[3][3]; int i,j,k,l,m,n,e,f,g,h; float det=0; void main() { clrscr(); cout<<"Enter the 3x3 matrix :\n";//Enters the matrix for(i=0;i<3;i++) for(j=0;j<3;j++) cin>>A[i][j]; //To find cofactor and determinant for(i=0,k=1,m=2,e=-1,g=2;i<3;i++,e++,g--,k-=g,m-=e) { for(j=0,l=1,n=2,f=-1,h=2;j<3;j++,f++,h--,l-=h,n-=f) { B[i][j]=pow(-1,(i+j))*((A[k][l]*A[m][n])-(A[m][l]*A[k][n])); if(i==0) { det+=A[i][j]*B[i][j]; } } } cout<<"The determinant of … |
| | hello there guys I have attached a picture of the error that I've been receiving in coding my tetris program, anyone here who knows how to fix this? please help me thanks in advance.  |
| | hello! I have a function with the following definition: void functionName(void** a); When I want to call that function how am I supposed to send the arguments?  |
| | I have noticed the foolowing details regarding fstream. the following combination of openstate flags do not truncate the files. ios_base::out | ios_base::in | <any flag other than ios_base::trunc> ios_base::out | ios_base::app | <any flag other than ios_base::trunc> the following combinations are resulting in a failbit ios_base::app ios_base::ate ios_base::app | aos_base::ate … |
| | I need to create a program that uses a structure that alocates memory with the new operator. The information must be saved in a file, then displayed. The problem I have is that the program saves only the first character of the words I enter. Could someone please help me … |
| | Hello. All i am having trouble with using public ref classes and gcnew. The following code will show you my situation. Vector2 class /// </summary> public ref class vector2{ public: vector2(void):x(""),y(""){}; System::String ^x; System::String ^y; void Position(System::String ^ X, System::String^ Y){ x=X; y=Y; }; }; Add picture class public ref …  |
| | hi guys.... i make a program with Dev-C++ ..... let say my program is already running now .... if i try to open it ... it show me a MessageBox or an output to tell me i can't run it when is already running |
| | Hi, everyone. Hope you can help me to answer the question, i am not familiar with recursive function...and i hope someone could help me.. Shift elements means e.g. array[ ] = {1, 2, 3, 4, 5, 6}; if the user input a value, say 2, the array will become {5, … |
| | I'm trying to upgrade my class library to my current mathematical skill set and am having trouble with multi-term polynomials, especially those I where I don't know how many terms the user will be putting in. I know that the formula for the first derivative of a polynomial is ax^n … |
| | #include<dos.h> #include<iostream.h> #include<stdlib.h> #include<conio.h> #include<stdio.h> #include<string.h> #include<graphics.h> int y; int i; struct element{ char name[20]; int at_no; double at_wt,at_r,en,ion,density,mp,bp; char ato_wt[20],ato_r[20],eno[20]; char iono[20],densityo[20],mpo[20],bpo[20]; char crs[20]; char sym[4]; char earr[100]; }E[118]; void numberfind(int); void numrfind(int,int); void massfind(double); void namfind(char*); void namlfind(char); void massrfind(double,double); void ionifind(double); void ionirfind(double,double); void enegfind(double); void enegrfind(double,double); …  |
| | [Moderator edit: 3500 lines of code removed as it was totally irrelevant to the question and severely affecting load time of the page] |
 | I am downloading content from a web source using URLDownloadToFile winapi function All is well, with that, the content is downloaded to the correct path. My probems start when I try to read it, like below, the loop never exits. myReadFile.open(sFile); if (myReadFile.is_open()) { while (!myReadFile.eof()) { //code; } } … |
 | I continue to use the same C++ libraries for COTS software that we use in my company. Their help files aren't great and when I send queries directly to the company it can be weeks or possibly months before I get a response. This, I think, is a simple problem … |
| | I'm currently trying to extend my student class with a course class & by extending the driver.cpp to enrol 3 students into the course. However, i've gotten some errors & can't seem to figure whats wrong with them, i might have missed out something. I was hoping to get some … |
| | So; I have to determine if there is a) 3 of a kind b)4 of a kind c)straight. I have put the 7 cards into a 1 dimensional array and sorted them but I also need a case for not being more than 4 cards. I don't need to include … |
| | The code is really long so I don't want to post all of it, but I'm posting the part I'm having an issue with. This is part of a fraction class I'm writing. Most of it is working but for there is something wrong with the istream because when I … |
| | Hi there guys may I ask if there's anyone here who has a complete guide or maybe just a guide on how to make the tetris game in c#? Thank you very much I really need your help. |
| | I'm trying to convert My Console classes to .Net classes because I can't use std::vector or anything like that in WindowsFormsApplications. So I decided to convert all Vectors to Lists and I thought that the classes work the same but my code below throws a massive amount of errors and … |
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