51,593 Topics
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| | [CODE] const char* findThisMsgInMem = "Hello World! Everyone is Happy"; if(memcmp(&dataInMem[i], findThisMsgInMem, defaultMsgSize) == 0) { memcpy(&dataInMem[i], newMsg, strlen(newMsg)); //more code here }[/CODE] This is first time for me trying to use malloc, and realloc. Please see the coding example for illustration purposes. Don't worry of this lengthy question, most … |
| | I am enclosing my code and as you can see below the Event Recorded Banner the event type will not display. I would appreciate if you could show me what my problem may be. Everything else works properly. I am stuck. [code=cplusplus] #include <iomanip> #include <cmath> #include "EventBooker.h" EventBooker::EventBooker() { … |
 | I have a problem with a program I'm writing. It's supposed to find the factorial of the number you input, but it's not. The problem seems to be that the recursive function isn't...well...recursing. Right now, when compiled, the program multiplies the number by the number before it. So if it's … |
| | So I have the below code to check the input, I'm just having trouble because apparently flushing the input causes the tests (its an assignment) to lock up and I need to manually break out of it. The problem is that if I remove the flushing of the input it … |
| | So, I'm attempting to write an object oriented program that solves simple sudoku puzzles by checking the rows, columns, and the 3 x 3 grid. [code] #include <iostream> using namespace std; #include "doth.h" int main() { User file: Sudoku call; int flag=0,ptx=0,pty=0; call.Display(); for(;flag != 1;) {[COLOR="Red"] if (Puzzle[ptx][pty]==0) { … |
| | Hi, I have a homework problem in where I have to count the vowels from a readin file from a flashdrive/harddrive. Then the amounts of each vowel has to be displayed & which occurred the most amount of times & which occurred the least amount of times. Extra credit (which … |
| | I have a little problem. I have a lot of code in the backgroundWorker2 (//Do Stuff) When pressing the button1_Click, everything works great and the code executes for the backgroundworker. But if I now try to drag the form around on the desktop, the form will "get stuck"(Not Responding). It … |
| | I am new to C++ and attempting to complete an exercise my question is How you can use cin.ignore to ignore every character up to and including a specified character – for example a full stop, ’.’.  |
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| | I am at work and did this program on notepad and not sure if this is correct or not. Can someone that has the visual studio compiler test this and let me know if it works. If it does no could you offer any minor feedback on the location of …  |
| | I'm new to threading and wanted to make a program that was going to receive data from two separate pieces of hardware and populate a queu with their data. I then wanted to pull the data out of the queue and draw it to the screen graphically. So each piece … |
| | I was given this assignment to create a function and have the user input a number and the function is suppose to give you the amount of change back. My program is listed below [code] #include<iostream> using namespace std; int change(int,int& ,int& ,int& ,int& ,int& ,int& ); int main() { … |
 | I was reading about the new "tuple" type coming in c++0x, and I decided to try it. I saw that if you give a compiler flag -std=c++0x it will work. So I did it, and then #include <tuple> works and everything was good. Then I decided to try the default … |
| | For this assignment you will write a wrapper routine for the LAPACK routine DGESV to solve the system of equations Ax=b (where A is a num by num matrix, and x and b are vectors of length num). A wrapper is a routine that reformats (or supplements) it's arguements in … |
| | For this you will write a Gaussian Elimination routine (with or without pivoting - for most of you, I highly suggest without) that solves the equation A x = b where A is a square matrix (num by num), and x and b are vectors. A and b are known, … |
| | Is there a built in type to store UNordered pairs? ie. I want these [code] pair<double, double> a(4.0, 5.0); pair<double, double> a(5.0, 4.0); [/code] to be equal. Do I have to make a wrapper and override == ? Thanks, Dave |
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| | I often have this situation [code] class OrientedPoint { private: Point P; Vector N; Color C; bool valid; public: //////////// Constructors ////////// OrientedPoint() {} OrientedPoint(const Point &Coord); OrientedPoint(const Point &Coord, const Vector &Normal); OrientedPoint(const Point &Coord, const Color &C); OrientedPoint(const Point &Coord, const Vector &Normal, const Color &C); [/code] where … |
| | Use the stack class in a program that reads a String, one character at a time, and determine whether the String contains balanced parentheses, that is , for each left parenthesis ( if there any ) there is exactly one matching right parenthesis later in the String . so the … |
| | trying to write a program in C++ that will take a DC voltage as an input into a PIC16F88 (18 pin). and will output 2 seperate voltages, to run two different motors. when the input voltage is greater then 1.5v it will output a small voltage to both outputs, and … |
| | Is pthreads still the way to go to detach a process from the main thread in linux? It seems seems kind of convoluted/old/c-style from looking at some examples - is there a more "c++" way? Thanks, Dave |
 | Hi! can someone tell me how to count the number of lines?  |
| | csci>g++ -c queue.cpp csci>g++ queue.o project6.cpp Undefined first referenced symbol in file Queue<int>::return_index() /var/tmp//ccHbZwrM.o Queue<int>::enqueue(int) /var/tmp//ccHbZwrM.o Queue<int>::dequeue() /var/tmp//ccHbZwrM.o ld: fatal: Symbol referencing errors. No output written to a.out collect2: ld returned 1 exit status These are my errors. As you can see, my implementation file compiles, but does not compile … |
| | Hello..... i got a problem where my output are repeated..... how to solve this problem.... [code=cplusplus] #include <stdio.h> #include <stdlib.h> #include <iostream> #define MAX 100 int num[MAX]; int n; int nrows = 0; int temp =2; using namespace std; void print() { if (num != 0) { for (int i …  |
| | I have recently learned about virtual functions and it is to my understanding that they are a keyword that goes in front of the return type when defining a function. They go in a base class, and make it so that if a member function of the base class is … |
| | Hi, i was wondering if it is possible to launch a .exe file using c++? say i want to write a simple program which will ask the user if the would like to install the following.:(i am just making it up) Please pick the number beside the program to launch … |
| | I am testing a program that I am trying to run and having some difficulties with it. If you run this program I am able to compille it fine but will not return anything and stalls on me...Here are the instructions..... There are 25 digits split into five groups of … |
| | ok so i have some code that works perfectly with visual studio 2003, but when i move it into my project which is using visual studio 2008, the compiler spits out 9 errors. compiler output: [CODE]1>Compiling... 1>main.cpp 1>.\main.cpp(3) : error C2011: '_STORAGE_QUERY_TYPE' : 'enum' type redefinition 1> C:\Program Files\Microsoft SDKs\Windows\v6.0A\include\winioctl.h(641) … |
| | Hi basically I've exhausted my mind looking for resources and help on the Huffman Tree Coding. This is my problem, there are 2 parts to what I have to do, the first done: 1. Given a text file, determine the frequency of each character in the text (map of character … |
| | ok, so i essentially have a .c file from anubis' process injection code, that i need converted to c++, which is the format of the rest of my product. on compiling, i am getting one annoying error error (when i compile as a .cpp file): [CODE]1>.\inject.cpp(27) : error C2440: '=' … |
| | [CODE]#include <iostream> #include <fstream> #include <string> #include <sstream> #include <math.h> #include <windows.h> using namespace std; int main() { int l, pos, pos1; unsigned long int currnum; string str0, str1; stringstream out; string::iterator x1, x2; float koren; bool find = 0; ifstream fin("koren.in"); ofstream fout("koren.out"); if(fin.is_open()) { fin>>l; fin>>str0; fin.close(); currnum=159; … |
| | ok. Heres the thing. I need to make cases for keydowns. I am catching the keycodes and them pass them on to switches. the un-understandable part for me is this: I have the same case for 'TAB' and 'DOWN' keys. Now, I was wondering if instead of repeating the same … |
| | Hello, I just joined, so if I infringe upon any of the forum rules, then I apologize. Anyway, I have a code for approximating integrals via the Simpson's Method. The problem with the code is that somewhere within the mere 52 lines, I have divided my entire sum by 2. … |
| | have to write a program to rotate the elements of an array a specified number of places input by the user, with these specifications: 1. A positive number indicates a rotation to the right 2. A negative number indicates a rotation to the left 3. Use only pointer notation (not …  |
 | Can this program be shortened any further? I basicallly need to write a program that reads in two numbers and a char. eg. 10 + 10 then outputs its value.... The char can either be + or - or *. The number will always be less than 100. and you … |
| | I have a problem about the code that skip the ID Number can you analyze the problem just enter 2 for adding and you can see the result |
| | hello! I like to define the Distance class and overload binary + operator to add the two distances using friend function. my program is here. But it does not work. The error message said that "undefined symbol feet". What is the problem? [code] #include<iostream.h> class Distance { int feet; float … |
| | You operate several hot dog stands distributed throughout town. Define a class named HotDogStand that has a member variable for the hot dog stand's ID number and a member variable for how many hot dogs the stand has sold that day. Create a constructor that allows a user of the … |
| | am a beginner in C++; am writing a program on C++ and i have bin trying to make a user enter his username and to enter a password and If correct the program will output a message such as: "Welcome Name of User” If incorrect my program should allow at … |
| | Hello, I am a newbie to programing but I seem to be getting the hang of things. I am trying to create an plain text encription program that inputs the cipher key and encription text to be accepted via either comma deliminated txt or excel file. I have my program … |
| | Before the sum is given, the program closes. What's causing this? [code] #include <iostream> //function main int main() { //var declarations int number1; int number2; int sum; std::cout << "Enter first number: "; std::cin >> number1; //read first integer from user into number1 std::cout << "Enter second number: "; std::cin … |
| | this is a code to convert infix string to postfix...... but i am having some problems please help me:( #include<iostream.h> #include<conio.h> #include<stdlib.h> #include<string.h> int presidence( ); void infixToPostfix(char *); template<class T> class Stack { private: T *data; int capacity; int top; public: Stack(); Stack(int ); T pop(); void push(T); int … |
| | I'm stuck accessing a 2D map How do I retrieve data out of the inner map? [code]map <string, map <int, class> > myMap[/code] When I set up and iterator it, I get a std::pair. it->second should yield a pair aswell because it points to map <int, class> but I can't … |
| | Hey friends i just want some help....well got a simple task this weekend to make a rings of different colors using circles....like i want an output in which a circle appear on top left and after little delay another one appear near to the first one...and so on......and all should … |
| | Can I use this function to read a percent Value from an ini? For example it would be something like this if (Life drops below X percent) (cDrinkaPotion) The code I have so far only reads key values and such, I dont know how to read a number value.. [CODE]bool … |
| | hey, I've two classes and one class inherit the first class. I'm trying to add objects to vector (could be parent or child) and then call the overriding function (print) to display values passed in their respective constructors. But for some reasons only parent class' function (print) is invoked. I … |
| | I'm trying to recursively search through directories and pull out any files or subdirectories. This is the code I have: [code=cplusplus] int readDir(string directory, vector<string> &fileList) //directory is the name of a direcotry //fileList is an empty vector DIR *dir; struct dirent *ent; if((dir = opendir(director.c_str()) == NULL){ cout<<"Invalid Directory"<<endl; … |
| | How do I find the Parity Check Matrix, when I’m given the generator matrix? e.g. | 1 0 0 1 1 | G = | 0 1 0 1 2 | | 0 0 1 1 3 | Can anybody teach me how to find the Parity Check Matrix or … |
 | I'm unsure of how declaring **x (a pointer to a pointer of x) is the same as declaring x[][] (a two-dimensional array of x's)... The theory I have is this: int *x = {whatever}; (x is a pointer to the first int value) *x (first array item, value pointed to …  |
| | I got a question which i cannot do. Pls help me. (This is using Turbo C++ IDE). The questions are: Q1. WAP to print the sum of the following series: 2(square) + {2(square) + 4(square)} + {2(square) + 4(square) + 6(square)} .............. till N terms. Q2. WAP to find out … |
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