51,593 Topics
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| | Hello! I have small problem. I have char array which contains e.g. "10010010100010110" and I want to read/write it from/to file in binary mode. How can I convert my char array to a group of bits and how to write/read it to/from file? I need something like this: 1. I … |
| | Guys, in this program, we have a file by the name of asharray.txt, which is attached to this post, and we have three functions: 1.to read the file 2.to sort the numbers 3.to write to a separate file by the name of( array result.txt) Sp, here I faced some problems, … |
| | Does anyone know how to create circular linked list whose links are numbered from 1 to n specified by the user? |
| | I'm trying to clean up my coding a bit for a program I'm working on. Here's an example of my code (not my exact code, but I've adapted it to an example): [CODE]class Example { private: double* group; int number; public: Example() {group=new double[1]; number=0;}; Example(const Example& ex); Example& Example::operator=(const … |
| | How can i create a program that can continuously run immidiately when comp is logged in . This program should have to run as a process which can continuously check some conditions. Please kindly reply. [i]email snipped[/i] |
| | Hi all, I m new to C++ and very desperately looking for some help in my code.Im trying to write a program that uses bisection method to find the root of a function.Im having problems as my results are not accurate enough and my function (f) does not produce answers … |
| | I plan on using the Bayesian method to try and solve the mastermind problem. The user will enter 4 numbers which represent the colors on the board from 6 different colors. After which the computer will randomly estimate the posterior probabilities for all events. ?Then continue with this scheme until … |
| | [CODE]class BinarySearchTree { public: BinarySearchTree (void); bool addRecursively // calls addRecursive (see private) (BinarySearchTreeNode* newAdd); bool addIteratively (BinarySearchTreeNode* newAdd); void writeRecursively // calls writeRecursive (see private) (ostream& outfile) const; void writeIteratively // if implemented, requires a stack - (ostream& outfile) const; // - see oop06 private: void addRecursively (BinarySearchTreeNode* currentRoot, … |
| | Hi, I am trying to convert a char pointer to a normal char(somehow copy the strings from the pointer and pass it to the char) Here is a piece of example on what i want to do [code] #include <iostream> #include <windows.h> using namespace std; int main() { char *namen="Test"; …  |
| | [CODE]#include <vector> #include <iostream> #include <iomanip> using namespace std; typedef vector<double>row; typedef vector<row>Matrix; Matrix grade; void read_matrix(Matrix&grade,vector<string>&names); void display_matrix(const Matrix&grades,const vector<string>&names); void read_matrix(Matrix&grade,vector<string>&names) { int grades; cout << "Reading data into a Matrix " << endl; cin >>grades; if(grades== 0) { cout << "Making vector empty." << endl; grade.resize(0); } … |
| | we are in a section were we are working with classes also with arrays my question is if you have an array of students how can you remove that student for the list by copying the other students for below up a slot. |
| | In my program I am creating a class instance then writing it to a binary file. I do this several times so I have several instances of this class in my file. Then I want to access them individually, read them back into an instance in the program, change its … |
| | Problem: Course Grade Modification Write a program that uses a structure to store the following information: Name, idNum, tests, avg, and grade I got the most of the program completed so far, however I still need to do the average and grade, if anyone can assist me I would greatly … |
 | hey guys i wrote a code for honework problem...the code works fine however everytime user puts more number than the static array it keep those number in the memory and later in the program if i do cout and cin it will ignore that and assign the number to the … |
| | [CODE] #include<iostream> #include<fstream> #include<string> using namespace std; void main() { //decleration ifstream source; ofstream target; char * box; int width, height, numlevel; string s; int amount= 100; //-------------------- source.open("1.ppm",ios::binary); while(source.fail()) { cout<<"can not open the file"<<endl; // to make sure the file is opened } source>> s; if ( s … |
| | Create a program that prompts the user for their first name, then displays it with asterisks between each letter. Do not include an asterisk in the beginning nor the end. For example, Sharon would be displayed as: S*h*a*r*o*n . Here is what I have so far: [CODE] #include <cmath> #include …  |
| | So I have one problem and I put in the code for you to see. This is the code that i am having problems with: [code]int main (void){ FancyDateClass myDateObj(24, 2, 2008); cout << "\n\n"; cout << "The date is "; myDateObj.displayDate(); cout << "\n\n"; cout << "The month for … |
| | Hello. This is my first posting so I will try to be as detailed and clear as possible. I am running into a problem with a method returning an incorrect value and I can't quite seem to figure out why. I'm building a Rolodex which is really just an object … |
 | I keep getting the following error: [code] Error 1 error C2678: binary '+' : no operator found which takes a left-hand operand of type 'int' (or there is no acceptable conversion) [/code] and I can't figure out how to fix it...I believe it has something to do with the red … |
| | Hello everyone I am trying to learn about the compilation process. I am working on a pretty simple SDL game, but I know that making games isn't very practical, so I am using the project to learn about other programming aspects as well. One of the things I am trying …  |
| | Hi all. Just a quick question for anyone who might know. Is there any way of setting up the entering of a character or number without having to press the return key after? For all options i input into my program when i run it i always have to press … |
| | i tried to make a program to compare two string and display which character will come first as you can see below but it gives certain error can any one guide me what changes i have to make [CODE]int Mystrcmp (const char* , const char* ); { cout<<Mystrcmp(v1,v2); } int … |
| | int note1in() { system("cls"); string a; ifstream note1 ("note1.txt"); while (!note1.eof() ) { getline (note1, a); cout << "The note reads: " << endl << a << endl << endl; } note1.close(); system("pause"); note1out(); } int note1out() { string a; cout << "Begin re-writing the note... " << endl; getline … |
| | Like there are authorities like sun which maintains java documentations, python.org which maintains python docs and for others where the developer of the language reference also maintains the documentations of the library and language reference documentations. What is the authoritative entity that maintains the complete c/c++ documentations? I was looking … |
 | hi , i have a function parameter that i need it to be a char and also a const char* . can anyone help me? [CODE] void write(...) // ??? { } //.............................. if(somethin) { write('c'); } else write("string"); [/CODE] |
 | So I am creating a Lockerz program using Visual C++. I have created a few buttons and the web browser thing. It all works great. Accept, when it gets to a page that play a video, I get this error: [CODE]An error occurred in a script on this page Line: … |
| | c++ program that convert integer in to hexadecimal |
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| | Hello I am working on a project for my roommate that involves reading in a text file that has x's and o's. The x's mean a wall and the o's mean an open path. The maze begins at 0,0 and ends at 15, 15. This makes the graph 15x15. I … |
| | Hi there, I'm having trouble with my program, which crashes when accessing values through a pointer. I've created a sample program that demonstrates my problem. Little synopsis: A Character has 2 attributes, a Bone, and a vector of pointers to Bones. I have a parser file that has functions to … |
| | I cannot figure out what this error message means? [code] #include <iostream> using namespace std; double max_array(const double x[], int max_val); int main (void) { int i, max_val; double x[max_val]; double array_avg, array_max, array_min; cout<<"Enter likely number of values: "; cin>>max_val; cout<<"Enter values seperated by white space:"; for (i=0;i<max_val;i++) cin>>x[i]; … |
| | Hello daniweb. Seems like this site is amongst the latest and the greatest in programming and software development. Anyways: [B]Attempt to compile with gcc: [/B]C:\>gcc -o ywordf ywordf.cpp [B]Error:[/B] ywordf.cpp: In function `int main(int, char**)': ywordf.cpp:30: error: no match for 'operator!=' in 'i != __gnu_norm::multimap<_Key, _Tp, _Compare, _Alloc>::rend() [with _Key … |
| | Good evening everyone, I would like to ask about copy constructors. I have been working on a base\derived class C++ program in which I am trying to compare the areas of a couple of Rectangles, and once I get past the errors I am currently having, I wouldn't mind comparing …  |
| | Does anyone know a function equivalent to GetAsynKeyState() ? to test if a key is pressed? i am trying to use it for a keylogger...and except windwos hooks,thanks  |
| | Is it possible to delete a non dynamic variable? Or is it automatically deleted when I construct a new one with the same name? [CODE] int N; int N; [/CODE] Is this possible? My purpose is, that I want to use an object from a class in a loop: [CODE] … |
| | I wrote winapi application.Which during creation defined : [code=c++] CreateGLWindow(hwnd,"OpenGL",800,600,16,fullscreen); CreateWindow(TEXT("button"), TEXT("Choose Shading Mode"), WS_CHILD | WS_VISIBLE | BS_GROUPBOX,10, 610, 300, 120, hwnd, (HMENU) 0,hInstance, NULL); CreateWindow(TEXT("button"), TEXT("Wireframe"), WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON,20, 630, 100, 30, hwnd, (HMENU)IDC_M_WIRE , hInstance, NULL); CreateWindow(TEXT("button"), TEXT("Flat"), WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON,20, 660, 100, … |
| | i made the following program but its not working can someone tell me where i did mistake [CODE]#include <iostream> #include <cstdlib> #include<cmath> #include<iomanip> #include <cstring> int myStrlen (const char* s); int main() { cout<<myStrlen; } int myStrlen (const char* str1) { char str[25] = "How"; strlen(str); return strlen(str); }[/CODE] |
| | here is the other problem project im sure it's something small im missing. for some reason there is no print out for the most used letter demo.cpp [CODE] /* File Name: demo.cpp Chapter No. 12 - Exercise No. 9 Programmer: Carl Sue Date Last Modified: Mar 23, 2010 Problem Statement: … |
| | [CODE] #include <iostream> #include <fstream> // I/O #include <iomanip> // For setw() using namespace std; ofstream outputfile("output.txt"); // Output file const int MAX_FILE_NAME = 35; const double INTEREST_RATE1 = 0.010; const double INTEREST_RATE2 = 0.010; const double LEVEL_ONE_BALANCE = 1000.00; const double MINIMUM_PAYMENT = 10.00; const double MINIMUM_PAYMENT_PERCENT = 0.10; … |
| | This is a conceptual question to help with a program I am developing. It takes two lists from a file and compares them in parallel to see if they are anagrams. My question is how do I store these strings in a one dimensional array mapped to ASCII codes. I … |
| | hi , i am having difficulty in implementing the basic mathematic principle of inclusion-exclusion. I want to find the no. of numbers in a range from 1 to N which are divisible by another set of numbers where size of set <= 15. Now the problem i am facing is … |
| | hello guys, i want to know how to write a program that can read txt file. example like this, ClassAttendance1.txt and ClassAttendance1.txt contained Student ID number and name. i want to write a program that if i run the program will detect all ClassAttendance .txt and make a summary in … |
| | int *p; int *q; p = new int; *p = 35; q = new int; *q = 62; p = q; cout << *p << ", " << *q << endl; answers : a. 35, 35 c. 35, 62 b.62, 62 d.62, 35 |
| | I'm making a library for myself, and I keep getting that error :( Pib.h: [code=cpp] #pragma once #include "stdafx.h" #include <iostream> #include <string> using namespace std; class Pib{ public: void echo (int Text); void test(void); }; void Pib::echo(int Text){ printf("Haha: "+Text); }; void Pib::test(void){ cout<<"Text"; }; [/code] Main File: [code=cpp] … |
| | I see this topic has been hacked to death but it seems to be slightly different in each case. Anyway, I've been chopping away at this code for awhile. I realize that it is easier to overload the () rather than the [] which is what I was determined to … |
| | hi, sorry for the newb questions, ive got this part of a assignment its instructions are: "Define a class called Clock -it has a single, private, data member of type unsigned long called secs -it has these four public interface methods plus necessary constructors setClock() accepts nothing, returns nothing - … |
| | Hi everyone. This is my first post here at DW. I was just experimenting with programs and thus I am trying to implement [B]Bisection Method[/B] & [B]False Position / Regula Falsi Method[/B] into a C++ program. Once I am done doing these two, ill start coding the [B]Newton-Raphson Method[/B]. All …  |
| | Im getting the wrong output. In my while loop for the else statement I want it to perform the subtraction operation and then put that data on the queue pq2. I put a cout statement to make sure that the data is on the pq2 queue. However Im getting weird … |
| | Hi, I am working on a C++ select algorithm using the qsort function. I am suppose to first sort the array and then return the i-th smallest value, which is given by the stat value. However, I have no idea how to return the value from a void array. I … |
| | Hello guys, this is my first time in these forums, so I apologize for my bad English. Well, here's the problem: I need to get the frequency of integer numbers that are stored in a file, their range is from 0 to 100, their amount is unknown and depends on … |
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