51,593 Topics
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 | > Not sure why do I always get a 0 from the isvalidReal function? int isvalidReal(string signedNum) { bool check; int i = 0, j = 1; string str = "+-."; for (i = 0; i <= signedNum.length(); i++) { if (isdigit(signedNum[i])) { check = 1; } else if (signedNum[0] … |
| | I posted a simliar issue ealier, but I've changed my approach since then. #ifndef TIME_H #define TIME_H class Time { public: Time(int = 0, int = 0, int = 0); ~Time(); int hour; // valid values are 0 to 23 int minute; // valid values are 0 to 59 int …  |
 | I'm writing a program to parse a user entered string. My textbook does not include the .find() function, but I found it in an old C++ book (Ivor Horton's Beginning C++, the Complete Language) is the .find() considered bad, or depricated? It seems to work really well, but I don't … |
| | > The following letters are stored in an alphabet array: B, J, K, M, S, and Z. > Write and test a function named adlet(), which accepts the alphabet array and a new letter >as arguments, and then inserts the new letter in the correct alphabetical order in the array. … |
| | Guys, In below code after reading string values from vector , I can have output like("VarID","flag","count") for(int i=0; i < v.size(); i++){ cout<<v[i]<<endl; } All are (varID,flag and count)are string literal , now i need to populate the structre with this string literal. where VarID = int,flag=bool, count=Int. Can anybody …  |
| | Guys, In below code they are couple of issues. (1) I am not able to read first key and value pair record from snmp.json file in my map, it just start reading after first record. (2) After reading the value from file in current implementation it is not reading the …  |
| | How to play a sound file in c++. I am trying to make an alarm program. I've done everything but i need to play sound at certain time. please help..............  |
| | Hello, I am currently working on a binary search tree that acts as a phone book. I am nearly completed with it and all functions seem to work properly except in two cases: An error message will not print to the screen when trying to delete or edit for a … |
| | Hi every one, Can any one tell me the major difference between JAVA and C++...  |
 | [Click Here](http://s8.postimg.org/ab4paaq8l/New_Bitmap_Image.png) is adding m_y, m_m, m_d, considered as cheating? if not, how to get the value for getYMD()'s param? |
| | I am looking for a simple c/c++ code that converts 16b-greyscale image to raw format using tiffio.h?. |
 | Hi, I want to show/hide my MFC Dialog from another class; Main App : HomeWorkApp Main Dlg : HomeWorkDlg #include "HomeWorkDlg.h" #include "HomeWorkApp.h" CWorkUser::CWorkUser() { // Initialize MFC Dialog here.. // How ?? MainDlg->ShowWindow(SW_SHOW); } CWorkUser::~CWorkUser() { // Finalize MFC Dialog here.. } Thanks.. |
 | Hello! I was creating a custom array class as an exercise in my exploring of class and function templates. Here's my header file: #include <iostream> template <typename el> class Array { friend std::ostream &operator<<(std::ostream&,const Array&); friend std::istream &operator>>(std::istream&,Array&); public: Array(const int& arraySize=0); //set all members of array with size arraySize …  |
 | All A template function must have at least ---------- generic data type 1Zero 2one 3two 4 three witch is answer is correct? |
| | Use a DO WHILE loop |
| | Hi guys. There seems to be a lot of people on this forum who know what they are talking about. My question is simple. I'm fairly new to c++ and i have hit a brick wall. I'm trying to write a simple program that grabs 2 txt files and outputs …  |
 | I dont clearly understand bool functions. this lends problems to my current assignment in class where i have to write a program that involves a bool function that tests for letters in a string that the user inputs. Can anyone offer help to me? the whole code is slightly confusing … |
| | hey , I'm trying to read a 24 bit bmp file but after reading the first pixel something goes wrong, any ideas? int i; FILE* f = fopen("Sample.bmp", "rb"); unsigned char info[54]; fread(info, sizeof(unsigned char), 54, f); // read the 54-byte header // extract image height and width from header … |
 | Hi what are Macros used for in C++? i never heard this word in my entire life :D and what are `assert()` and `NDEBUG`? |
| | i need your help to find c++ code for Clustering algorithm for energy efficiency in wireless sensor networks  |
| | I know that there's no solution book for C++ Primer 5th Edition by Stanley Lipmann but is there any on the web? Would appreciate any help on this. Thanks.  |
| | Hi , I have a small 2d array and I want to check if it exists in a bigger 2d array. I have coded it but I don't know what am I doing wrong cause even if exists it won't detect it. 2 arrays are PI and NPI. PI is …  |
| | This program hangs when I enter the number of vertices only..It does nothing..I am not able to figure out what's wrong with this.Please help #include<iostream> #include <list> using namespace std; // This class represents a directed graph using adjacency list representation class Graph { int V; // No. of vertices … |
 | OK. I just don't understand what is the problem here. Here's the code .h file : #ifndef NVECTOR_H #define NVECTOR_H class Nvector { public: //Nvector(); Nvector(int Size = 0); void addElement(int a, int index); void getElement(int index); void push_me_back(int a); void push_me_front(int a); private: int *p_array; int velicina; int *resize_array(int … |
| | int game() { int n; cout << "enter an odd number: "; cin >> n; int MagicSquare[n][n]; // It says that the expression must have a constant type? int newRow,newCol; int i = 0; int j = n / 2; for (int i = 0; i < n; i++) { … |
 | heres the code that i use for put the form transparent: LONG style= GetWindowLong(hwnd, GWL_EXSTYLE); style=style | WS_EX_LAYERED; SetWindowLong(hwnd, GWL_EXSTYLE, style); SetLayeredWindowAttributes(hwnd, clrBackColor, NULL, LWA_COLORKEY); but i see problems :( the form and the controls are showed, but the mouse events are ignored. if i click on button or form, … |
| | Hello, anyone can suggest me a simple lua wrapper with clean code? I want to call from c++ lua functions but I dont really get it.. I only know a little LUA and C++. Example lua function I have: Get the level: function Lv(a) local lv = GetChaAttr( a , … |
| | I am a beginner, and want to know how can run the code in notepad with visual studio. I tried with a simple code by --<<All Program -->microsoft Visual --> visual Studio tools --> visual Studio command prompmt. The error is: ''fatal error C1083: cannot open source file: filename.cpp: No … |
| | Hi! So, I made this code #include<iostream> #include<cstdlib> #include<pthread.h> using namespace std; const int m=6; const int n=5; const int s=5; const int r=8; const int num_thrd=3; class data{ public: int* A; int* B; int* C; int start; }; void* multiply(void* pod) { data* P=(data*)pod; for(int i=P->start;i<m;i+=num_thrd) { for(int j=0;j<r;j++) … |
| | Hi i tried to test some new features of C++ 11 but how come Visual Studio doesn't support `constexpr`? i tried this simple function but it won't compile constexpr int multiply(int x, int y) { return x * y; } |
 | Consider a stack module like (two files stack.h stack.cpp) which supports the these functions; void push (stack *, std::string); std::string & pop(stack &); bool isEmpty(stack &); std::string & top (stack *); I didnt understand this part what it means. Also I declared stack like; struct stack { … }; But … |
 | Forgive me if this is somewhat basic. If have an array of 20 strings defined: char const commands[20][20] = {// each command string will have a maximum of 20 chars. "quit", "open", "save", "close" }; I want to test the command value to see what action should be taken. int … |
| | I am using below regex to find urls in paragraph.I have to make url as sysetem local path,Network folder path,web urls. Its not working in some cases.I need help to make generic regex which test urls in paragraph as my requirement. @"(?:(/>/>/>(http:\/\/www\.)|(www\.)|(http:\/\/)|(https:\/\/)|(https:\/\/www\.)|((ftp|gopher|telnet|file|notes|ms-help):(/>/>/>//)))+[\w\d:#@%/;$()~_?\+-=\\\&]*)|(?:(/>/>/>\\\\)|[file\:|[\w]\:|[\\w])(\\[a-z_\ \-\s0-9\.]||///+)+(.*)? Url Samples: \\Test-2\Users\IT Administrator \\Test-2\Users\IT Administrator is … |
| | hi to all user i am new in file handling , i know file handling but not much , my instructor taught me that use binary search tree in a file to search key value ,key value(like any thing such that record can be easily make out and comparision can … |
| | I have a text file and i want to replace a word from a specific location. For example want to replace 5th word from 12th line of file. How i can do that? |
| | Please where to start to be a profficional C# programmer? |
| | Dear members please help me in understanding the control flow in the following code, thanks #include <iostream> class constructs #include <iostream> class constructs { char inp; public: void acceptCharacter() { cout<<"Enter a character: "; cin>>inp; if(inp>='A') //ASCII value of A = 65 if(intp<='Z') //ASCII value of Z = 90 cout<<endl<<"Uppercase"; … |
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| | how i plot the sensor(mpuc6050) coding in c++.and i want a program that show 2 sticks in dos screen... |
| | Hi everybody. I hope nobody is working too hard. I am trying to figure out a way to use the peek() method of the stringstream class but looking more than one place forward. For example, if I use stringstream.peek() it will let me know the value one value ahead of … |
 | Hello. Well, im a little confused as to what exactly the terms Data Abstraction and Data Encapsulation mean: This is what i read: [B]Data Abstraction[/B]:data abstraction is a process of representing the essential features without including implementation details. [B]Data Encapsulation:[/B]: Data encapsulation, also known as data hiding, is the mechanism … |
| | Hi, I have been assigned to a system integration project. However, I do not understand part of the integration implementation arhitecture. For example, I have a passport scanner connected to a Windows Client application constructed in C++. The client application would going to pass the passport picture, name, address etc, … |
| | Hi! Have anybody seen Scot Meyers' video on Universal references? In order for a reference to be "universal" two requirements should be fulfilled : 1)variable should have double ampersand after it's type : sometype&& 2) the type should be deduced . The second point is somewhat confusing to me: despite … |
| | Hello, I need for my game inventory function a mysql query which checks the next available free slot id. example: I have item on slot 1, 2, 3 and 5. Slot 4,6,7,8,9 ... are free.. Now I need query which would get the number 4. Something like SELECT * FROM … |
| | > This compiles but does not show me any results? Why #include <iostream> #include <cmath> using namespace std; void dist(int x1, int x2, int y1, int y2) { double r1 , r2 , d ; r1 = sqrt((x1*x1) + (y1*y1)); r2 = sqrt((x2*x2) + (y2*y2)); d = sqrt((x2 - x1)*(x2 … |
| | void init1() { static int yrs = 1; cout << "The value of yrs is " << yrs << endl; yrs = yrs + 2; return; } void init2() { static int yrs; yrs = 1; cout << "The value of yrs is " << yrs << endl; yrs = … |
| | #include <iostream> #include <cmath> using namespace std; double dist(int x1, int x2, int y1, int y2) { double r1 , r2 , d ; r1 = sqrt((x1*x1) + (y1*y1)); r2 = sqrt((x2*x2) + (y2*y2)); d = sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1)); cout << " … |
| | > Write a C++ function named fracpart() that returns the fractional part of > any number passed to it. For example, if the number 256.879 is passed to fracpart(), the > number 0.879 should be returned. Have fracpart() call the whole() function you wrote in > Exercise 12. The number … |
| | Hello programmers! I have been working on STL algorithms for some time now as a beginner, and I started doing an exercise, among which is the task of `use the fill algorithm to fill the entire array of strings named items with "hello"`. My code for this is below: // … |
 | In the following program I'm getting the warning -> unused variable ‘fn’. I'm following along with a book so I don't know why it gave me that portion of code if it's unusable. Also, I don't understand this line at all. -> `void(*fn)(int& a, int* b) = add;` #include <iostream> … |
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