C++ :: Adding New Options To String Class
Oct 8, 2014
I'm giving the replace option to my string:
void replace(string oldstring, string newstring) {
int stroldstringpos=b.find(oldstring);
b.replace(stroldstringpos,newstring.length(),newstring);
}
i have 1 error in these function that i'm confused. imagine the newstring size is more big than the oldstring, how can change the string, but only change the oldstring and add what left?
see these:
String test="hi hello world";
test.replace("hi","hello");
the result must be:
hello hello world
how can i change the replace function for it?
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Jun 29, 2014
I had written a "DLL" in VB.NET a year or two ago to read and set MP3 tags. I want to write this exact same library in C++ so I can convert it in my droid project, and to get a hands on introduction to C++. So far this attempt has been a total mind melt!
I am finally wrapping my head around .cpp and .h files so there is light at the end of this tunnel. Here is my problem now:
I wrote the VB project with properties for each tag in the MP3 file, then I could get and set them - easy stuff.
When I try this in C++ I get compile error: a property can only appear within the definition of a managed type. I can usually stumble through Google searches and figure out this type of stuff on my own, but this one is stumping me -- I think I am missing some fundamental stuff here.
My code:
// MP3Tags.h
#pragma once;
#include <string>
using namespace std;
using namespace System::IO;
[Code]....
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Jan 10, 2015
I have an inventory array in a class called inventory. This class is in a different program. How do I access and add to this array for my main program?
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Feb 5, 2014
I'd like to start out by adding an array to a C++ class. I'd like to be able to reference the array using a class object that I create, for example:
Class is Stone.
Stone Bob is an instance of "stone" that I name "Bob".
"Bob.array[1] = "granite";" tells the compiler that the second element in the array (with the first being the zeroth element) is a string containing "granite".
I'll eventually want to extend this to an n x m matrix within the "stone" class that can be referenced as: Bob.matrix[1][3]="lignite";
I tried to make this work using a text again and again last night to no avail. My code is below.
NOTE: Since I am dynamically allocating memory space, I'd like to avoid memory leaks when using this class with dynamically allocated arrays and matrices. Not sure how to do this. Also need some insight into "destructor", and why my simple version reduced to a comment below doesn't seem to please the compiler.
CODE FOLLOWS:
Code:
// AINOW.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <string>
using std:: string;
using std:: cout;
using std:: endl;
using std:: cin;
[code]....
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Feb 13, 2013
I am trying to add matrices a and b. I am getting an error in the "add" function, probably because I have m[i] in it, and m is not an array. What is the correct way of writing the "add" member function here?
Also, although the "read" and "write" member functions of the class are working just fine, do you think there is a better way of writing them?
Code:
#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
const int rows=3;
const int columns=3;
[code].....
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Feb 25, 2014
So I have this code:
temp =count + " x " + name;
if (count > 0) { Stats.Inventory.Add(temp); }
Where Inventory is declared as
public static List<String> Inventory, Sellables;
and temp and count are declared locally as
double count = 0;
string name = string.Empty,temp = string.Empty;
An it throws an error
>Craft.exe!Craft.Stats.InventoryUpdate(string NewInventory) Line 166 + 0x73 bytesC#
My main questions is why? This is my first time using lists
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Sep 17, 2012
Im doing a little game, casting dices etc. The problem is that the program will ask for player 1 then if i enter a name and enter it will ask for player two and so going on until i just press enter with a empty field and then continue the game.
The problem is i don't have any clue what code bits to start studying and how i shall lay it up, feels like i need a new string declaration automatically for each name.
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Oct 10, 2013
how to add a list of information from a file to a vector of a class. Here is my code:
Champion_Info.h
#ifndef CHAMPION_INFO_H_INCLUDED
#define CHAMPION_INFO_H_INCLUDED
#include <vector>
#include <string>
[Code].....
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Jan 30, 2013
How would I add my own function to the vector class?
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Oct 22, 2013
I am trying to add data from a file that would go into a class that would later go into a vector of a class. I'm not really sure how to do it exactly. Here is the code:
Champion_Info.h
#ifndef CHAMPION_INFO_H_INCLUDED
#define CHAMPION_INFO_H_INCLUDED
#include <vector>
#include <string>
using namespace std;
class Champ_Info {
[Code] .....
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Dec 12, 2014
I need to add the current date to the end of a string but I only need to add the day and not the year or month.
Put the code This is what i have
char date[9];
_strdate(date);
cout << date << endl;
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Jun 10, 2013
string str = "sfsdfsd"
and i want to add like str[3]+str[4]
but it return some integer value
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Oct 31, 2013
I have a .cpp file which contains 5 smaller defined classes. In my missile class I have a default constructor and a constructor that I invoke
class Missile{
private:
bool isHuman;
[Code]...
My issue is when creating and adding the pointer object; it doesn't seem to create a new instance of the class-the Missile objects all share the same xPos value which is always the first xPos when the "fire" command is given. The "Missile *missile = new Missile(xPos, yPos, true);" line does not seem to create a new instance of the object with different variables but instead creates a new object with the same variables. Is it necessary for me to always make a separate .cpp and .h file for any class I want to create multiple instances of or can I keep the smaller classes in the same file and still create a new separate instance of the class?
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Feb 22, 2015
I'm having trouble finishing this program. What I'm trying to do is create a class for Rational numbers. Get input from user for denominator and numerator. Store the numbers without a sign, and for the sign store it separately in char. I'm not supposed to use accessor functions. The part that I can't seem to know how to do is use the info that was stored in the addUp function. This function need to add two rational numbers. i need to make this function general enough that it can handle two fractions, or a fraction and a whole number, or two whole numbers. What I already have here is readin function which reads in the numerator and denominator. setnumerator and setdenominator to assign positive values. setsign should get the sign of the fraction. Finally addUp should addUp which I explained before. I have some ideas about writing the tests, but can't seem to know how to implement it to the program. The main program is still empty but all I'm supposed to do there is call the class functions.
Code:
#include <iostream>
using namespace std;
class Rational {
private:
int numerator, denominator;
char sign;
[Code] .....
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Aug 15, 2014
I am making a program that formats a string. I want to create a new 2 dimensional string that will have many other chars and strings in it beside the original string. Then I split the string up on the newlines and return it. Adding different parts to the 2d string e.g. I need to add five _ as chars not string then I need to add different things. First I use sprintf () to add as much as possible. And then I do what to add the rest?
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Mar 17, 2014
I have called a C function inside C++ code. The .so which gets created is a 32 bit while I am looking for 64 bit . What all options should be mentioned in the Make file to eventually compile and get shared object of ELF64 CLASS ?
Excerpts from Makefile
-----------------------------
CC = gcc
CXX = g++
CPPFLAGS = -I. -I$(S) -DHAVE_CONFIG_H
CFLAGS = -O2 -pipe
CXXFLAGS = -g -O2
LDFLAGS =
LIBS = -lsocket -lnsl
[Code] .....
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Jan 9, 2013
I have the following private part of a class defined as follows:
private:
struct stats {
double ISIsum;
int authorCount;
bool operator<(const stats &a) const { return ISIsum > a.ISIsum;}
} *stats_;
bool compareSortByISI(const stats &lhs, const stats &rhs);
};
This enables me to sort this struct by calling:
std::sort(stats_, stats_ + authors_->getMaximumAuthors());
My question is, what if I want to have the option to sort by authorCount or ISIsum at run time. Is there any way to do this?
I can't see how I can override operator< twice and decide which one to call at use time.
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Aug 5, 2013
I have been reading up, and it seems that all I need to do to finish up the installation of a library is to add in the search path for the library upon compile time.
Of course, I also read that directly copying the lib files can work too, but that may result in the over-writing of necessary files...
I read a more thorough document on mingw's linking processes and discovered that I could create a folder, install the library in that folder, and add the folder as a search path for mingw (so, basically, all i have to do is install all my libraries under that folder).
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Mar 4, 2014
I am having problems with setting up a menu as a function. The point of the menu is to display a list of 4 options and the user is supposed to choose one option and then the program will run. I am having trouble understanding how to display the menu once I run it because it is not working.
#include <iostream>
using namespace std;
int menu(int ans); // function declaration for menu
void draw_triangle(int size, char ch); //function declaration for triangle
void draw_downtri( int size, char ch); // function declaration for upside-down triangle
void draw_diamond(int size, char ch); //function declaration for diamond
[Code] ....
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Feb 3, 2014
Is there a way to access the router settings via c++? My friend wanted me to write something that would turn off wifi broadcasting on his router when pressing the button in the program. The only way I can think about is to connect to the router via .net framework and then use reverse engineering (on the router settings site) to find a way how to simulate change of option via POST or GET method.
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Feb 5, 2014
Using WPF and .NET 4.0 what would be the best way to utilize one panel but modify it for various options? For instance when having a basic or advanced view how would I go about changign the area to add buttons or other items most efficiently?
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Oct 21, 2013
I am new to coding and have a question with my if else statement. This is a VERY simple program that I have made something like in Javascript before, but when I do it in C++ it does not work correctly. It displays both the options. Here is my code.
// Practice.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
using namespace std;
int main()
// Asking for a number {
int x;
[Code] ....
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Oct 17, 2014
I want to run the following code from the command line:
Code:
#include <iostream>
using namespace std;
#ifdef ABC
const int num = 105;
[Code] ....
But I can not activate the ABC macro from the command line.
I'm trying to use the -d ABC option following the .exe file name, but I could not run the ABC macro.
How can I activate the ABC macro when I run the .exe file from the Windows 7 command line?
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Mar 23, 2014
I decided to create a simple program to display a menu with options, while that is easy enough I had some difficulty when selecting an option that has options inside which also has an option again. While I had many issues in the past I'm finally finished with it and it works fine, but being new to programming and not knowing various other methods available.
Code:
//:::::::::::::::::::::Simple Menu Program::::::::::::::::
//::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#include <iostream>
#include <string>
//function prototypes
[Code] .....
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Oct 16, 2013
I need a program that has a login system and then a menu that has 3 options: Add, delete and exit. If I choose Add it wil ask for certain data of 5 students.
Then after registering the 5 students, another menu with the options: Search, Delete and exit. In search it will ask for an ID and then prints all the data of a single student. Delete gives me the option to delete the data of any user I choose.
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Jul 28, 2014
My project is to make a options menu for the user to select a shape and than draw out the shape. That whole process is already done and ready to go. What i am having trouble on is totaling the number of selected shapes. For example, at the end of the program i need to prompt a message saying ("You have selected "shape" this many times "number").
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