51,593 Topics
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| | Hey Guys, I am new to the concept of Arrays and I need a little help. I have included the instructions for the problem as well as the code that I have so far. Can you help me with what I am doing wrong? Thanks! Write a program that asks …  |
| | Hi guys, I'm getting " SingletonMain.C:18: undefined reference to `Singleton<MyClass>::instance()' " compiling error. It doesn't make sense to me because MyClass inherits instance() from Singleton, doesn't it ? If someone could shed some light on it, I will be grateful. SingletonMain.C #include <iostream> #include "Singleton.h" using namespace std; [CODE]class MyClass … |
| | Hello I need to create an array of pointers for class dog is one class and showDog is the derived class. I need to input from a data file and store the variables to these classes. In the file there is a D for dog or S for showDog between … |
| | Hello everyone, as you can see I am new to this forum, I have had, not huge experience, but a bit of experience with c++. So I decidedt to make a keylogger. I know there are other ways to make this code shorter but for now i would like to …  |
| | Hi, i'm having some problems with my inheritance homework. It consists on writing a progrma that mimics the String lib by overloading different operands and then create two derive classes that will revert a string and that will change the cases to lower and upper. This is as far as … |
| | /* Write a program the nested for loops that display the output below. 0 0 1 0 1 2 0 1 2 3 0 1 2 3 4 0 1 2 3 4 5 */ [code=cplusplus] #include <iostream> #include <cmath> #include <cstdlib> #include <iomanip> using namespace std; int main () … |
| | Hello everyone I'm having a little difficulty, hopefully you guys can help or point me to the right direction. I'm trying to get a pointer from a class point to another pointer from another class. Naturally it doesn't work because the assignment operator doesn't allow us to do this so … |
| | Hi, I have completed a C++ application.It is about 3.5 mb in size. I need to create a demo version of this application,The application should not work after 30 days of installing and using it.. Is there something any software that allows you to create demo versions or what steps … |
| | Okay, here's the challenge, I know its probably pretty easy, but i'm just starting to learn and I have the challenge problem that I can't figure out, any help/guidance would be appreciated! This program will accept two numbers from the user and display the sum of the square roots of … |
 | I am getting a segmentation fault when i run the follwing program. This program takes in a const char* and returns the integer format. I also need advice on converting a C++ Octal or Hexadecimal Notationed string to an integer. Here is the code [CODE=C++] #include <iostream> #include <cstring> int …  |
| | Hey all. First time user here :) Im making a Windows XP C++ console application with Code Blocks (GNU GCC Compiler). This program is written to control another program that is missing some features i need (read input from external source). Last thing im missing from my program is little …  |
| | I'm writing a simple number generator program and I'm trying to find an easier way to get a random number, store it then display it. The catch is I don't want duplicated numbers (each need to be different). here is what I have so far, it does work but I'll … |
| | Hi, I am having a problem with the following function: [CODE]void calcEnergy( vector< vector<double> > &Energy, vector< vector<double> > &Data, const double Constant ) { double Time = 6; // store the change in time double energy ; // Temp variable to store energy double v1,v2; for ( size_t i …  |
| | Hi there, I have an array of strings defined in the following way; [code] string wordbank[]={"yes", "no", "hello", "goodbye"}; [/code] My problem is I would like to create a seperate array of characters for each element of that array. Something of the form; char *word_0[]={'y','e','s'} The things I have tried … |
| | Hi, I wish to know that the cause of the following error when i run the program : a) Is memory leak in the program B) The system on which i am running the program has insufficient memory. [ICODE] terminate called after throwing an instance of 'St9bad_alloc' what(): St9bad_alloc[/ICODE] Thanks |
| | In the following program, implement the function a. int *biggest(int *a, int count); This finds the largest element in an array of integers. #include <stdio.h> #define SIZE 16 int* biggest(int *a, int count); int main(void) { int values[16] = { 47, 17, 38, 91, 33, 24, 99, 35, 42, 10, … |
| | I tried searching the forum, but I couldn't find any threads that really dealt with what I'm trying to do here. I have a struct set up with three fields (shown below). [code] struct StudentInfo { char id[10]; double mark; char grade; }; [/code] [I]Note that the id MUST be … |
| | can someone teach me from the basics how to use and become comfortable with graphics.h???plz i need it badly for my project at school and out of my interestto complete my project within august.im unable to continue without graphics.h and dos.h |
| | This is my first year of BIT and im doing C++ for first year atm. Now i have this assignment which is i have to generate random number, and prompt the user to quess the number. when they quest it right i have to prompt that they are right and …  |
| | Can you tell me how to resolve my problem. i can reserve the matrix A and B into file, but how to read , i can't remember...above, shows what i pretend to do.. # include <iostream> # include <fstream> using namespace std; int main() { int matriz[3][3]; int x,i,j;//variables for … |
| | Write a program to implement a survey that prompts respondents to enter an integral value within a specified range to indicate how they like a new product. Since the program must be adaptable to any arbitrary number of respondents and value ranges, define macro MAX_RESPONDENTS to represent the maximum number … |
| | [code]#include<iostream> #include<fstream> #include"d_nodel.h" using namespace std; void merge(dnode<double> *, dnode<double> *); //free function to merge the two lists int main() { dnode<double> *listA = new dnode<double>; dnode<double> *listB = new dnode<double>; double sz1, sz2; int val1; //first set of integers int val2; //second set of integers ifstream inFile; //declares the … |
| | Ive used the search function just found one thing I needed more detailed help I need to a read file of float numbers no more than 100 numbers but can be less than 100 into an array I have made sample file contain 1 2 3 I have the following … |
| | If I have a class that has a vector as a private member, a get function to access the vector, and I iterator over the vector, the iteration only works correctly if I make a new copy of the vector: [code] class MyClass { public: typedef vector<int> Vector; MyClass(); ~MyClass() … |
| | I have everything almost done, the only problem I have is that I can't seem to get the linked list to advance when the terms start out with different exponents and instead of just printing the results I will tie them into a third list. Can you see what I'm … |
| | can someone help me complete this code please, on the ares i put comments please. thanks #include <stdio.h> #include <string.h> class wordRecord { public: char* word; wordRecord* next; void printWord() { printf("%s\n", word); }; }; class abstractWordList { private: void printWordsHelper(wordRecord* wordRecPtr) { if (wordRecPtr) { // Code omitted to … |
| | Write a program to implement a survey that prompts respondents to enter an integral value within a specified range to indicate how they like a new product. Since the program must be adaptable to any arbitrary number of respondents and value ranges, define macro MAX_RESPONDENTS to represent the maximum number … |
| | Hello, I'm trying to get the STL equal_range function to work on a data structure I've designed, but I may be trying to use the equal_range function in a non-standard way. Is there a way to get this to work? Basically, I have a vector of vectors of structures (elements) … |
| | Here i have to define a function which will reverse a c-styled string. I have made 2 functions one using dynamic memory and the other not using dynamic memory. I would like to know of any improvements that can be made in the code. I would also like you to … |
| | Ok I'm doing an assignment to create a solar system. I've gotten the program to function but having trouble with some of the colors for the planets. I'm wanting Venus to be gold & Mercury to be brown (or as close as possible). I have the Sun, Mars & Earth …  |
| | hey...! we were given this assignment to make a game in c++ using pointer, classes, structures etc! we were also asked to introduce graphics in the game to get bonus marks! i've coded the game but the problem is that i have no cluee watsoever how to introduce graphics in … |
| | I am just starting to work with Visual C++ Express 2008 and have run into a situtation I could use help with. To add a new data source to a project I am told to start the data source configuration wizard, this I can do. Next I am to select … |
| | I take one look at this project, define my structure.....and my brain goes numb. I don't know where to star..... ///////project/////// Write a program that dynamically allocates an array large enough to hold a user defined number of structures (string name and three double tests). Using a function, the user … |
| | Hi. I am working on a little program that will be able to open files and read them. The problem is that i CANNOT tell the user to manually type the directory and the name of the file ! It would be madness. So i need to use GetOpenFileName dialog... … |
| | int sum=0, a=0, b=0; for (a=1;a<3;a++) for (b=1;b<5;b++) sum+=b; cout <<"sum =" <<sum; The answer is 20, sure, but I have'nt got my head around how it actually works. Could someone explain it step by step please? |
| | I get this error: [quote] error C2785: 'std::ostream &operator <<(std::ostream &,const Outsider<T>::Nested &)' and '<Unknown>' have different return types [/quote] When trying to compile the following code with VS2008: [CODE=cplusplus] #include <iostream> using namespace std; template <class T> class Outsider { private: class Nested { private: T myData; public: Nested(const … |
| | Good day. I have a problem with matrices / arrays, i cannot resolve. I have no idea how to start... I have two 2D matrices and i want to overlap (mix?) one over the other, no matter what dimensions they have. For example : a = [ (1,2,3,4,5), (9,7), (0,0,0,0,0), … |
| | I want to do a multithreading program in c++. How to create thread in C++. I made a class with methods start() , run() etc for this purpose. But how to give delays. Am not able to implement multithreading. Can anyone tell me how to do that |
| | Q1: Write a program to implement a survey that prompts respondents to enter an integral value within a specified range to indicate how they like a new product. Since the program must be adaptable to any arbitrary number of respondents and value ranges, define macro MAX_RESPONDENTS to represent the maximum …  |
 | Hello friends, I'm working on a program that takes a number input from the user and recursively sums the number 'n' to one. For example, inputting a 5 would sum 1/5 + 1/4 + 1/3+ 1/2 + 1/1. I have sucessfully gotten the fraction sequence to display but I am … |
| | ok i have 2 series of p... the user give which one was want... and then give the iterations that he/she want this is the series 4. P= sqrt(8*(1+ (1/9)+(1/25)+(1/49)+... )) 5. P= sqrt(24*((1/4)+(1/16)+(1/36)+(1/64)+...)) code:: first for series 4..... [code] int i; double: serieValue=0,pi=0; cout<<"Iterations"; cin>>i; for (long int n … |
| | Hello! I want to find the position of objects on my sensor field. I have uploaded the diagram of sensor field attached In the figure S1-S8 are the laser sensor pointing into the field. While red and yellow are the balls [B] Case 1:[/B] if there is only one ball, … |
| | how can i compute a code if i enter numbers then if i press any key its stops and computes the inputs of all no. |
| | i couldnt figure out this any help anyone????? it should checked [TEX]if there an Appointment on the same Date and Time![/TEX] but its not. i can still put more then 1 record on the same date and time???? [CODE]void addAppRecords( ) { int number; system("cls"); //clear screen cout<<"\nHow many Appointments … |
| | Hi,all I am implementing the required assignment and face compiler error which i do not understand. Here is my class: [CODE=c++] class fooPlayer { public: fooPlayerfunc(){}//doing something here char askYesNo(std::string question); }; class fooPlayerFactory { public: virtual std::auto_ptr<fooPlayer> MakePlayerX() const; virtual std::auto_ptr<fooPlayer> MakePlayerO() const; private: std::auto_ptr<fooPlayer> MakePlayer(char letter) const; std::auto_ptr<fooPlayer> …  |
| | Hey One and All, My teacher gave us a set of practice problems which are ones with addresses and she wants us to do the math out long hand and give her the answer by writing it out. On the test we will not be able to run it to …  |
 | Hi, this time I've borrowed a book called "Windows Game Programming for Dummies", albeit old it is still useful! However, I came across a problem writing a simple code the author made, namely the TextOut() The error it gives me at build time is as follows: [CODE]1>c:\users\shadow\documents\visual studio 2008\projects\g_app\g_app\main.cpp(75) : … |
| | Hi, I am getting the following error in my code. [ICODE] malloc: *** error for object 0x3b0fe80: double free *** set a breakpoint in malloc_error_break to debug[/ICODE] When i debug it and do a backtrace i get the following [ICODE] #0 0x90c994a9 in malloc_error_break () #1 0x90c94497 in szone_error () … |
| | Hi, I am having trouble with a C++ problem for school. Im writing a program that takes input for the highest and lowest temperatures of each month, and stores them in a 2 dimensional array. I then wrote 2 fuctions to find the average high and low temps. Part of … |
| | [code]#include<iostream> #include<fstream> using namespace std; int main() { dnode<double> *listA = new dnode<double>; dnode<double> *listB = new dnode<double>; int val1; //first set of integers int val2; //second set of integers ifstream inFile; //declares the inFile //Read in a file to build the two lists inFile.open("lnkList.in"); //Open the input file //statement … |
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