I have heard that people should implement their class member functions in files that are different from their class declaration files. But in cases there are multiple classes that are inter-related to each other, how will you review the source code ?
View 1 RepliesI'm developing a stack using a linked list. I have to develop two friend functions to do something with the list. But I've tried to understand the friendship, without any consistent result.
Extract of code:
Code:
class Element {
public:
int Data;
Element *nextElement;
Element(int Element) {Data = Element; nextElement = NULL;}
~Element() { }
[Code] ....
I have no errors, but I cannot access the private properties of the class.
The thing I would like to do is: sum the elements of the stack with a friend function.
When including a header file in stdafx.h, should that file still be included in the source file where it is actually used?
If it is included in both places, is the one in the source file ignored?
I am trying to run multiple source files but right after the first one finishes running the program closes and doesn't move on ...
View 2 Replies View RelatedI've recently been learning GTK (though this question is not specific to GTK), and came across a situation that I was unsure how to best handle. Essentially, I've defined several pointers in one source file, and I want to access those pointers from other source files.
The structure of my GTK programs generally follow this pattern:
- "main.c": Define the main window and run GTK main
- "create_window.c": Create and arrange widget pointers in the main window
- "program_functions.c": All other source code for the project (several source files in reality)
In "create_window.c", I declare and define all my widget pointers (e.g. label). If I need to modify those widgets in "program_functions.c" for any reason (say, to change the value of a label), I need access to the pointers created in "create_window.c".
My first thought was to create a global struct of pointers in "create_window.c", and extern that struct to the other source files that need access to the pointers. The thing I don't like about this approach is spreading globals across my program.
My second idea was to create access functions in "create_window.c" where the necessary pointers are statically stored. The first time I call this function (immediately after creating a widget), a static copy of that pointer is stored in the function. Each time afterwards when I call that function (from other source files), I simply use that static pointer to access the widget of interest.
Example:
Code: void edit_label_1(GtkWidget *label_set, const char *string)
{
static GtkWidget *label = NULL;
[Code].....
Are either one of the approaches considered acceptable by standard practice?
How I can compile multiple source file in visual studio 2012 ???
View 1 Replies View RelatedIn general, my problem is that I've been trying to reorganize the project I and my group are working on into separate project files. Everything was working perfectly fine before, but now I'm facing the wrath of undefined reference errors when I try to call my DLL functions.
I have them declared and included in the central header file here :
Code:
/* DLL functions */
typedef void ( * t_wait )( int milliseconds, const int frames_per_seconds );
typedef clock_t ( * ft_timer )( int command, t_timer * timer_object ); /* clock_t is usually defined as long */
typedef void ( * t_SDL_errorexit )( const char * message );
typedef SDL_Surface * ( * t_load_image )( char * image_path, unsigned is_transparent );
[Code]...
Then I have them imported here :
Code:
/* ******************************************************** */
/* ********* win_error( char *, bool ) ********* */
/* ******************************************************** */
/* - Displays a GUI for a windows specific error message, */
/* pass true to it to have it exit the program, pass false */
/* to have it continue */
/* ******************************************************** */
extern void win_error( char * message, bool is_exit )
{
/* Note : win_error uses the Win32 Api */
/* ********************************** */
char buffer[BUFSIZ] = { 0 }; /*
[code]...
This doesn't work, as my compiler sees it that I am trying to call invalid functions, whereas I have made sure to import the functions before calling. Obviously my compiler can't tell that, and is trying to protect me from calling them.
The source files are compiled as C++, but I'm using C-style code instead of true C++ code.
Obviously I'm using Windows style DLL linking, but if the only ways to share imported functions are non-standard, only post ways that will work on as low as Windows XP.
I have tried to statically link them before, but that led to a problem that I posted a while back. Which led me to dynamically linking, which was problem-free until I separated my code into separate files.
My program needs to compile various source files at runtime.What is the most elegant way to compile cross platform with g++ from within my program? Is there a gcc-library I can use? I know that I could use popen() to open a Unix pipe and call g++ as command line tool. But first it isn't really cross platform and second it doesn't seem elegant to me.
View 10 Replies View RelatedI know it sounds strange but I've seen things that have files which contain source code (usually in something in Python or such) and how this is read on run-time?
View 1 Replies View RelatedFor example, I have the below files in a project called Calculate :
Source files : Calculate.cpp , Average.cpp (with out main)
Header files : Calculate.h , Average.h
I knew in general, we have to include Average.h to project header file Calculate.h to make it as part of project.
technical difference between adding header file (Average.h) to either project header file (Calculate.h) or project source file (Calculate.cpp) ?
I found no difference in an output. But, there must be technical difference.
I'm trying to make sure my code is written in smaller modules, so my first step is to create my initialization process in and external file to load the necessary data from external sources and set up things like the content of drop down list boxes.
My first attempt failed to give me access to the combobox items add function so I moved that code back into the form1.h file:
Code:
public:
Form1(void) {
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
void AddDate(char *date, int ID)
{
this->comboBox1->Items->Add("line 1");
}
It compiles fine, but the call to it in my Initialize.cpp file
Code:
MarketView::Form1::AddDate("abs",1);
Gives error C2352: 'MarketView::Form1::AddDate' : illegal call of non-static member function
OK, so I change "void AddDate" to "static void AddDate" and now get the error that "static member functions do not have 'this' pointers" so I go back to the "MarketView::Form1::comboBox1" situation where there is no legal syntax after "Box1 to get me to Items->Add
I've been an old fashion programmer for over 47 years. It seems as is the concept of programming computers has changed from the concepts of logic to memorization of complex syntax.
There has to be a simple answer to do this other than to write thousands of lines of code in one Form1.h file. I refuse to believe that the new programming concepts will not allow you to write code in smaller more manageable modules.
What is the proper syntax for breaking up the larger file into more manageable chucks?
Here's a few parts of a program I'm working at. It does compile, and it does work as expected. Anyway Eclipse Kepler marks one line as a bug with the remark Field 'befehl' could not be resolved. The bug sign didn't show up when both classes were in one file.
ScriptInterpreter maintains and processes a vector of Objects, initialised with example data. An iterator of the vector keeps track of the current position while various methods process the data. I've copied the relevant lines only.
I can live with a few wrongly bug-marked lines in Eclipse. What I don't want is any hidden errors that express at some time later.
Is there anything wrong with the code? Anything that's not recommended and compiles anyway? Is anything c++11-specific about the questionable line?
AtomicCommand.h
class AtomicCommand {
public:
int befehl;
[Code] .....
Note that line 9 has a bug sign, too. Eclipse doesn't recognise all my c++11 code.
We typically don't bother with massive, monolithic code files that get processed from top to bottom. In the Object Oriented world, code files don't mean much. In fact, in C#, I could have multiple classes defined in one file, or have one class split across several files.
View 7 Replies View RelatedI would like to make a sort of text parser, in which one enters a string, and it is broken by the whitespaces into chunks, and those chunks compared to different "dictionaries" where the words are assigned a value. For example if the operator enters "take lamp" it would separate "take" and "lamp" and then produce preassigned values for each of these words.
View 3 Replies View RelatedI am having the issue of trying to call functions of a class through the header file.
Test.h
#ifndef TEST_H
#define TEST_H
class Test {
public:
void Hello();
[code]....
This code returns the error "undefined reference to 'Test::Hello()'"
All I am trying to do is call the Hello(); function in a seperate file.
I am struggling to enable friendship between two classes in separate header files for a banking program.
I am attempting to get the Person class to use variables from the Account class. Heres what I have so far.
ACCOUNT.h:
Code:
#include<iostream>
#include<fstream>
#include<cctype>
#include<iomanip>
#include <string>
#include <math.h>
#include <windows.h>
#include <vector>
#include "Person.h"
using namespace std;
class person;
[code].....
I'm trying to print a single linked list backward with functions/classes. I have created the main file and 3 header files. But I'm getting an error on one of the header files, linkedListIterator after adding #include "linkedListType.h". It says that "linkedLlistType.h" is calling itself. And when I try to run it, I get an error of "too many header files." I have tried changing the headers many times, but nothing seems to work.
.cpp file:
/*(Printing a single linked list backward) Include the functions reversePrint and recursiveReversePrint, as discussed in this chapter, in the class linkedListType. Also, write a program function to print a (single) linked list backward. (Use either the class unorderedLinkedList or the class orderedLinkedList to test your function.)*/
#include "linkedListType.h"
#include "orderedLinkedList.h"
#include "linkedListIterator.h"
#include <iostream>
using namespace std;
struct nodeType
[Code] ....
header files:
[URL] .... (error in this header file)
[URL] ....
I have a text file which contains ASCII of A,B and C like below,
65
66
67
Now I need to create a file which containing letters related with above ASCII like below, ABC
This is my code.
#include<iostream>
#include<fstream>
#include<string>
[Code]....
Here's my class/header, and Visual studio Output.
Injection point/instantiation.
int main() {
Player player;
Call to a public method:
while(!isWin("x", board) && !isWin("o", board) && whoGoesFirst == "p") {
printBoard(board);
board = player.playerTurn(board);
[Code] .....
Output:
1234
1
1> Player.cpp
1>c:users
sccdocumentsvisual studio 2012projectsprog 2100 - assignment 1prog 2100 - assignment 1player.h(10): error C2143: syntax error : missing ';' before '<'
1>c:users
sccdocumentsvisual studio 2012projectsprog 2100 - assignment 1prog 2100 - assignment 1player.h(10): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:users
sccdocumentsvisual studio 2012projectsprog 2100 - assignment 1prog 2100 - assignment 1player.h(10): error C2238: unexpected token(s) preceding ';'
How is it possible to store the related data of a program C++ into an external file (like as .txt) and retrieve it?
I want to write c++ program that can contain data members " id and phone"
like as
Code:
class profile {
private: int id,phone;
public:
void retriever() {
cout<<"Enter your ID: ";
cin>>id;
cout<<"Your Phone number is "<< phone;
};
}
avoiding formats in above class, purpose is to store data already in txt file with different id and phone numbers and it is to be retrieved by matching id number to txt file and viewing its related phone number.
Write a program using user-defined function which is passed a string and that function should cycle the string.(Do not use any string related functions). E.g.
If the string is : Chetna then it should print as Chetna, hetnaC, etnaCh, tnaChe,naChet, aChetn
Ans.
#include <iostream>
using namespace std;
char swamp(char a[], int x) {
for(int k=0; k<=x; k++) {
char l= a[x]; a[x]= a[0]; char p=a[x-1]; a[x-1]=l;
for(int i=1; i<x-2; i++) {
[Code]...
Currently i have a system that will store user input into a txt file, and have a function that will compute the daily sales of the month(Check by system date month) and display the sales of the day and the grand total of that month.
Take for example, the system date now check that the current month is Apr. Below are my current output:
20Apr2015 $11.5
20Apr2015 $15.5
22Apr2015 $4.5
25Apr2015 $4.5
28Apr2015 $4.5
20Apr2015 $4.5
Grand Total $45
But my desired result should be as below
20Apr2015 $31.5
22Apr2015 $4.5
25Apr2015 $4.5
28Apr2015 $4.5
Grand Total $45
Textfile data:
1|Bag|2|3|6|20Apr2015
2|Fruit|2.3|5|11.5|20Apr2015
3|Fruit|2.3|5|15.5|20Apr2015
4|Water|0.9|5|4.5|22Apr2015
5|Water|0.9|5|4.5|25Apr2015
6|Water|0.9|5|4.5|20Jul2015
7|Water|0.9|5|4.5|20Jul2015
8|Water|0.9|5|4.5|28Apr2015
9|Water|0.9|5|4.5|20Apr2015
Below are my code.
struct TransactionPile {
// to record item information.
string itemid;
string itemdesc;
float unitprice;
int quantity;
float totalprice;
string date;
[Code] ....
I have an array of (Student)classes created in Manager.h, which contains a new instance of class Name (name),(in Student.h)How would I go about accessing the SetFirstName method in Name.cpp if I was in a class Manager.cpp? I have tried using Students[i].name.SetFirstName("name");
// In Manager.h
#include"Student.h"
class Manager
{
[Code]....
I am writing a program to hide files behind other files using Alternate Data Streams in Windows NTFS file systems.
The program is as follows:
Code:
#include <stdio.h>
#include <stdlib.h>
int main(void){
char hostfile[75], hiddenfile[75], hiddenFileName[15] ;
printf("Enter the name(with extension) and path of the file whose behind you want to hide another file: ");
scanf("%75s", hostfile);
[Code]...
The complier is showing error as "Extra Perimeter in call to system" but I am not getting where?
I am writing a piece of code that requires me to display the last 1000 lines from a multiple text files (log files). FYI, I am running on Linux and using g++.
I have a log file from which - if it contains more than 1000 lines, I need to display the last 1000 lines. However, the log file could get rotated. So, in case where the current log file contains less than 1000 lines, I have to go to older log file and display the remaining. For e.g., if log got rotated and new log file contains 20 lines, I have to display the 980 lines from old log file + 20 from current log files.
What is the best way to do this? Even an outline algorithm will work.
I am making a game and want to make an updater that grabs the source code from a page on the web. Can this use things that are available to all platforms? It could just be something that grabs the text from the page and executing it (maybe using something like Python's exec() command ?) BTW I'm using mac
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