51,593 Topics
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 | Is it possible to change the value of a const variable? My aim is to change the directory of the Shell. I have set `const char* path = "C:\\"` as current directory. So if the user inputs "gd" then it will ask a directory to be set as the new …  |
| | Hello, I'm currently writing a program that is supposed to add, subtract, divide, and multiply fractions. I've been tinkering with it all day and I just can't seem to get it to work correctly. Right now I'm getting a floating point exception and I have no idea where to begin …  |
 | Anyone know where to BUY (not steal) this eBook? I don't want paperback because they are too difficult for me to read. I'd rather have eBook or PDF version so that I can change the font size to whatever I want. I've looked at Addison-Wesley web site but don't see … |
| | Hi i am new to c++, i need a code for an application with following specifications. 1. it should use RegisterPowerSettingNotification function and when WM_PowerBroadcast event is recieved then it finds if power source is ac or not. 2. if source is AC then it should execute a program. dev …  |
| | I was given a project to do, but I don't understand this notation and am rather confused, so I don't even know where to get started. I am supposed to be using the clock function to see how long it takes for the code below to finish running. Prefix Averages …  |
 | Hello, Looking at the standard streams provided by the stl libraries, it seems as though it is impossible to have 1 stream to use for both standard console IO and file/string IO. However, before I give up I would like to ask, is this possible: generic_stream stream; stream=cin; //now I … |
| | Hello People! I am quite new to Qt (and programming in general). And I am making a program that requires me to encrypt a file and decrypt it after asking for a password through the program. But I have no Idea where to start. What I already have - A …  |
| | I am trying this: int test(int **a){ return **a; } int main(){ int p[2]={1,2}; int *a=&p[0]; int **d=&a[0]; //for (int i=0;i<2;i++) // printf("\na=%d\n",a[i]); //ok this works for (int i=0;i<2;i++) printf("\n%d \n",test(&a[i])); return 0; } I want this ` printf("\n%d \n",test(&a[i]));` to work. I want to use a pointer. Thanks  |
| | can some one help me with this question.. "The name of students are sorted in an array of strings.Write a program to prepare alphabetically sorted listing of names.." |
| | I am using Qt5.2.1 I made a program that stores some values(like name, number, other details...) in a text file. I want to arrange this information according to the name. Something like this. A Alan 24140239 some_other_info Avril 64376334 some_other_info B bob 532523 some_other_info And so on |
| | A hardware merchant sells steel bars at a flat rate of Kes 1000.00 per meter, and has announced the following discounts: Quantity of steel bar bought (per meter) Discount (%) <20 0 21-40 5 41-60 10 61-80 15 81-100 20 >100 25 Implement the following programs: a) Using if..else statement, … |
| | I have a string and i want to conver the part of it to an int. I want to convert the part of the string `input[1]` to an int. But my compiler cant use atoi, or stoi.. I saw a ifstringstream option i think can work, but i tried implementing …  |
| | I want to optimize a directory listing input iterator so that the WIN32_FIND_DATA can be written directly to a vector (via emplace) instead of being first written inside the iterator. This is an idea of the code: /* std::vector<WIN32_FIND_DATA> vwfd; struct listing_it:std::iterator<std::input_iterator_tag, WIN32_FIND_DATA>{ HANDLE handle; WIN32_FIND_DATA wfd; auto operator*()->wfd&{return *wfd;} … |
| | I am using Qt5.2.1 and I made a program to do some stuff. In it I added a radio button (named 'others') i want that when the user clicks this button a line edit pops up besides it and lets the user enter some stuff inside it. when the user … |
| | #include<stdio.h> #include<conio.h> #include<dos.h> void print(char c,int x,int y); void main() { char a[3]={'A','L','I'}; int i=0,x=1,y=1; while(i<3) { print(a[i],y,x); i++; } } void print(char c,int x,int y) { int s=1,a; if(c=='A') { while(!kbhit()) { clrscr(); gotoxy(x,y); printf("*****"); gotoxy(x,y+1); printf("* *"); gotoxy(x,y+2); printf("* *"); gotoxy(x,y+3); printf("* *"); gotoxy(x,y+4); printf("*****"); gotoxy(x,y+5); printf("* *"); … |
 | Hi again guys this time I have a question about computer security that's related to my programming hobby. I hope this isn't against the rules. I am asking this out of curiosity and concern, not because I want to do evil. However thanks to some knowledge I gained from a … |
| | Hello, I have a `HWND` for a window. I have double checked that it is a 100% valid window by using `SetActiveWindow()`, `SetFocus()`, and `SetForegroundWindow()` on it, successfully bringing it to the frontmost window. However whenever I try to use `GetPixel` on it it returns -1 (0xFFFFFFFF). What am I … |
| | Hi i am new with C++, i just need a little bit help with this. please reply code compatible with orwell dev C++ I want an application that uses windows RegisterPowerSettingnotification function for the events of GUID_ACDC_PowerSource.... i tried like below but my dev C++ compiler was not able to … |
| | I have used Qt to create GUI program in C++, but i have given up in trying to statically compile Qt. i have moved on to microsoft visual studio 2013, the question i wanna ask is does the same problem occur in visual studio ( creating static programs ). if … |
 | I rote this code in my program JSONNode::const_iterator iter = root.begin(); for (; iter!=root.end(); ++iter) { const JSONNode& arrayNode = *iter; std::string type = arrayNode["type"].as_string(); if(type == "node") { std::string id = arrayNode["id"].as_string(); double lat = arrayNode["lat"].as_float(); double lon = arrayNode["lon"].as_float(); Node node; node.SetId(id); node.SetLatitude(lat); node.SetLongitude(lon); nodesMap.insert( std::pair<std::string, Node>(id, node) … |
| | I want to create a queue that holds certain information. I want it to hold multiple peices of information like below. Name, Age, Race, Sex. How can i create a queue FIFO. that holds multiple pieces of information like this that i can access or add into? Thanks! |
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| | How do I change this code so that the user can choose a math operation and determine have that type of operation(either add sub mult or divide) run as much as a user wants it to? Say, if the user wanted 5 addition questions only. And how do I keep … |
| | I created following classes in my program. Way.h class Way { private: std::string id; std::string name; public: Way(); Way(const Way& orig); void SetName(std::string name) { this->name = name; } std::string const & GetName() const { return name; } void SetId(std::string id) { this->id = id; } std::string const & GetId() …  |
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| | Hi all.. I have a image taken by vision machine camera.. Object is arrange by different layers.. I able to get accurate object position for those drop in calibration layer.. For layers that before and after calibration layer,position is not accurate.. Working distance is fix.. Can u all provide me … |
| | I need some assistance with a program I wrote and had to alter. Here are the initial instructions and what I initially had then my reworking and what I have now and any assistance would be helpful. Write a C++ program to help you balance your checkbook at the end … |
 | so i got a class going for making and showing tree elements, i need some help with the following: i need to display the leaves and the height of the tree. here is the code: // ar.cpp #include <iostream> #include <stdlib.h> using namespace std; class nod { public: char inf; … |
| | I'm trying to convert a number from any base between 2-36 to any base between 2-36. I have the conversion to base 10, but I'm having trouble getting it from base 10 to the desired base. Any ideas? I know part of this idea will work, I just can't get … |
| | I am trying to print my queue which has values in it. Right now i have this. for(int i = 1; i<ReadyQueue.size(); i++) { } But i am stuck now because i have no idea how to print a queue without popping it off the front. So now i am … |
| | I have a class below class CPU { public: void setPID (int a) { PID = a; } int retrievePID() { return PID; } private: int PID; }; And i am curious if you can create a queue into this class? I am trying to queue in a value into … |
| | Here is question: Write a program that reads a string from the user containing a date in the form mm/dd/yyyy. It should print the date in the form March 12, 2012. #include<iostream> using namespace std; int main() { int mon; int day; int year; string month[] = { "January", "February", … |
 | Write a program to get 3 numbers from user for integer variable a, b,and c. if a is not zero, find out whether it is the common divisor of b and c. |
| | How can i write it so that my program only accepts positive integers that are great than or = 0? I want my program to ask "How many devices do you wish to add?" And if a user enters a letter, or anything negative it will ask them to enter … |
| | I keep getting loads of linker errors that probably have something to do with virtual-functions/definitions and/or static class members... I've seen several relevant posts but none of the solutions suggested work, can you see wht the problem is here? My projects consists of 3 files: BALLS.H #include <iostream> using namespace … |
| | I am getting an error on this code. Is it to do with whats in the while loop? How do i get it working? Basically i want to be able to take in letter or number variables, and each would output something, and if they type exit it breaks out … |
| | How can i create a input that only allows the letters a b c d The console will ask to please enter a letter. And they can only enter the letters a b c d. And if they enter it, it says thank you for enter a, or b or … |
 | Ok this program is almost done. Some correction are still needed. Can anyone here put this in character array. #include<iostream.h> #include<conio.h> #include<stdio.h> char value; char t, u, v; char answer; void Binary2Decimal() { gotoxy(1,9);printf("[BINARY TO DECIMAL CONVERSION]"); char b2,f2=1,d2=0; gotoxy(1,11);printf("Enter a Binary number: "); scanf("%d", &b2); printf("\n\n"); while(b2>0) { if((b2%10)==1) … |
 | cd just stays at this state: sgraham@myshell:/home/class/sgraham>cd .. sgraham@myshell:/home/class/sgraham>cd .. typedef struct { int argument; // userCom arguments char *arg[MAX_ARGS + 1]; // userCom arguments array char *Listcomm[MAX_COMMAND_SIZE]; char *input; // hold input file char *output; // hold output file } Command; int main() { Command userCom; //holds userCom struct …  |
| | The only time I know of is when we call the assignment operator. Is there any other moments I should do it? Like any other operator where memory management would be useful? |
| | public: Queue() : front(0), back(0) {} void put(TreeNode *ptn) { ListNode *tmp = new ListNode(ptn, 0); if (back == 0) front = tmp; else back->next = tmp; back = tmp; } TreeNode *get() { assert(front); TreeNode *result = front->ptn; ListNode *tmp = front->next; delete front; front = tmp; if (front … |
| | i have declared two functions of void type.lets one function calculates value of variable 'c' and other of variable 'y' and when i cout them it comes out to be correct within the function.now i want to declare another function that compares values of 'c' and 'y' and return 1 … |
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 | My friend and I tried to create a team of programmers for doing bunch of work, our main aim is the gaming sector (probably). It was said around the net that it was hard work. So, we decided to plan it from now. I got around 1-3 years(blurry because I'm …  |
| | hello i'm trying to make this into a switch statment but i'm having trouble. Any help would be great!!! this is for a shell commands in C. if(strcmp(command->comm[0], "exit") ==0) //exit { printf("EXITING.....\n"); break; } else if(strcmp(command->comm[0],"history")==0) //history { int i=1; for(;i<hisSize;i++) printf(" %s ",history[i]); } //history end else if(strcmp(command->comm[0],"echo")==0) … |
| | I need help in writing a C++ program that converts 24-hour notation to 12-hour notation. (For example, it should convert 14:25 to 2:25 P.M. The input is given as two integers. There are three functions: one for input, one to do the conversion, and one for output. Record the A.M./P.M. … |
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 | Hi everyone and thanks in advance for the help. I have the following class that throws an error on compiling where i declase a vector of pointers I have an Engine class that I want to host multiple scenes objects stored in the vector sceneList and then pass which ever … |
| | Write A program that reads a statement of c++ langauge and prints a table of tokens and classes (keyword, identifier |
| | Hi, I need some help with starting a program. Kind of lost on how to begin it, any guide to start it would be helpful. Here is the link of the program: http://home.earthlink.net/~craie/122/labs/strfind.html I need to do all the different levels for this program. Thanks |
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