49,765 Topics
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| | Hello everyone, I'm trying my hand at the strategy design pattern. I've got most of my code working, however, I keep running into two errors "invalid use of undefined type `struct sortStrategy' " strategy->sort(students); "forward declaration of `struct sortStrategy' " strategy = s;} I did a google search on both … |
| | I wonder if there is any function that returns the difference in minutes for examples like this: 1300-1515 (135 minutes) 2350-0100 (70 minutes) Is there any timefunction that can have the ability to return the minutedifference ?  |
| | Part of the assignment I'm working on is to display random letters between my good letters to encode text. Right now I can make it display random numbers. How can I change this to out put random letters? [CODE] #include <iostream> #include <fstream> #include <ctype.h> #include <ctime> #include <cstdlib> #include … |
| | I am trying to do a command line switch with an if statement. The problem I am running into is when I am using a letter, it wont recognize it. When I use a number, no problem. I think there are a few different ways to solve this. Can anyone … |
| | Can anyone help me. I have a c++ project to do. The program must simulate a vending machine. I will post what i have so far. a data file must be hardcoded into it which provides the different drinks.[code]#include <iostream> #include <fstream> #include <string> using namespace std; const int SIZE=54; … |
 | please help me with this error: [COLOR="Red"]obj\Release\main.o:main.cpp:(.text+0x1c)||undefined reference to `__imp__CreateCWMp3@0'|[/COLOR] what is missing? I'm trying to compile [URL="http://www.inet.hr/~zcindori/libwmp3/index.html"]this[/URL] |
| | Hi to all, I have a homework about a banking system. I try to adding a branch in an array and the size of array dynamically increased. Here is my code but it gives run time error. [CODE]#include "BankingSystem.h" #include "Branch.h" #include <iostream> using namespace std; BankingSystem::BankingSystem(){ size=0; branches=NULL; } … |
| | I'm new to using C++ but I thought I would give it a try. The goal is to delete all files and folders located in %userprofile%\Local Settings\Temp without deleting the folder called "Bluezone" located in the Temp folder. Any help would be appreciated. |
| | [CODE]string lastNames(string name[],int SIZE){ stringstream ss; for(int i = 0; i < SIZE; i++){ ss << '"' << name[i].substr(0) << name[i].erase(name[i].find(',')) << '"' << " "; } return ss.str(); }[/CODE] this is outputting my list of names correctly other than all the names come out twice like "namename" how can … |
| | Hello all :) I'm working on a DLL with various of functions I later need in other applications. I have many classes, and most of them I need a global instance of. I've tried various things such as a singletonptr, singleton, global instantiation. What I need to achieve is the … |
| | I have a code that uses queue in c++ and 3 class Message, MessageSender, and MessageReceiver to express queue content. The program runned but it expressed wrong output as I hope. I inputted 3 message object but queue expressed no messages received. Please help me find errors. I think this … |
| | Does memory allocated for built-in types (in particular int, float and double) with the new operator initialize them to 0 (or 0.0, as the case may be)? Just trying to remember. (I seem to remember that new invokes a constructor even for the built-in types, but i'm not sure). |
| | Hi all, I use codeblocks to compile a simple project (actually an example) from [url]http://www.inet.hr/~zcindori/libwmp3/libwmp3.html#playc++[/url]. I have included the .h file and I fail to include .lib/.a I keep getting error[color=red] ld.exe||cannot find -libwmp3|[/color] Is there a missing thing? |
| | Just wanted to say thanks to everyone who gave input on that horrid assignment I had a couple of weeks ago! Anyway, I am back with new problems. To start, I just want help correctly writing out one particular void function which I am calling readLetters. Okay, so I wrote … |
| | I am trying to use an array that can change in length by the number in the command line. Arrays must be constant at the time of declaration. Can anyone help? [CODE] using namespace std; int main (int argc, char *argv[]) { int nulls=atoi(argv[2]); int arry[nulls]; } [/CODE]  |
| | Hi all, I just want to write a simple proxy to redirect client to different URLs. Say all users call the proxy server with the same URL and the proxy server redirect them to different URLs. How can I do such thing, can you please anyone comment on this. Thanks … |
| | Hey there, first time posting. I have a program that is kinda put together from a program to generate polynomials and evaluate them and a program to do bisection to solve for the root. It may be a mess. The problem is, i believe, when I try to use the … |
| | I'm a student having trouble with creating two vectors of objects for a homework assignment. The first vector creates fine, and prints out the values it imports (readM). The program hangs on the second vector(readT). I've checked the text files and they seem ok. I even tried substituting a simple …  |
| | Hey guys. I apologize for my sloppy code. But it got a bit longer than i expected so i stopped bothering about giving meaningful names to Variables later on in the program. Below I have a AVL tree(atleast that's what I intended to write). But my approach to it was … |
| | Hi I've been struggling with this for a very long time now. And I can't seem to get it done. I want to make an array, dynamic allocted array. Which act something like an vector (I know c++ has vector). So my approach was to create a [B]list_add() [/B]function. Its … |
| | How do you make a C++ Program run at start up? I'm using Vista, and when I right click the start button and press open, it comes up with my programs in the start menu, how do I get to the Start up Folder?:S |
| | Hi, I have an text file "CD details" with content as below 1~ Cast Away~ English~ Thriller~ U~ 2~ Titanic~ English~ Romance~ A~ 3~ Forest Gump~ English~ Life~ U~ I am trying to add some additional data to the start of each line by using a code as below [code] … |
 | I'm attempting to implement the trapezoidal method of calculating the integral of a curve. It's supposed to be the measure of water flow out of a tank's release valve. The water flow is a function of time in seconds where Y is the rate of discharge and X is time. … |
| | Could anyone tell me why this code read an extra line? It duplicates some of the last line, only it changes the number. For example, the text file (set up as an inventory file) reads: 45 car 23 bus 1 truck 4 van After running the program, it displays that, … |
| | I have a file of data that was put into a data file by another program with the same struct. for this program i want to take that data out of the .txt file and put it back into the struct array. is there any big code that is wrong … |
| | right now I am using slope calculations to determine the direction a selected unit needs to go basically the equation is (x2 - x1) / (x2 - x1) + (y2 - y1)to calculate the ratio of change in x to the total change in position. (y2 - y1) / (x2 … |
| | I have an issue with a function not working properly in my code -- It is a calendar creating program and when I call the function from the menu it blips the first line of text that it outputs to the user (asks a question for some input) and then … |
| | I'm trying to implement the algorithm described here under 'definition', [url]http://en.wikipedia.org/wiki/Laguerre%27s_method[/url] To summarise it takes an initial guess 0, and then iterates to find the root. In lines 68 to 71 I was hoping this would exit the function, i.e. when the root is found...but it's still carrying on. Can …  |
| | computeCube function is correct, but the main function has a problem. Explain why it doesn't work and show how to fix it. Your fix must be to the main function only; you must not change computeCube. [CODE] void computeCube(int n, int* ncubed) { *ncubed = n * n * n; … |
| | [CODE]void findMax(int arr[], int n, int* pToMax) { if (n <= 0) return; // no items, no maximum! int max = arr[0]; pToMax = &arr[0]; for (int i = 1; i < n; i++) { if (arr[i] > max) { max = arr[i]; pToMax = (arr+i); } } } int … |
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