In the first one I define a struct. In the second I declare/create a new class called mms and I include "def.h". The third one is the cpp file of the class and I include in it "mms.h" (no, I don't include in it "def.h"). The fourth and last has the 'main' and I include in it "mms.h"
For some reason I'm getting the "error: lnk2005 alread defined ..." I know it usually has to do with putting some header file or definitions twice but I can't see where I got wrong.
Since the signal function is also in file signal.h and I included it in "my_sygnal.h" file, I'm wondering why the compiler did not say anything about this "double declaration" of the function with the same name.
I have been trying to compile this program for 3 days. he subject is my error. I know it has something to do with including the cpp file with the header file however my textbook says this is what I must do in order to use templates. I have tried 2 compilers Code Blocks and Microsoft Visual C++ express 2010.
Here is my code:
header file #pragma once #ifndef _NODE #define _NODE template<class ItemType> class Node {
"fatal error LNK1169: one or more multiply defined symbols found"
Here's my code:
#include "stdafx.h" #include <iostream> using namespace std; int main () { cout << "Avoiding Technology" << endl; bool status = true; int location; int a,b;
I'm completely new to pointers and have a homework assignment due where I'm supposed to create a user defined dynamic array for player scores. The only errors I'm experiencing is a C2109: subscript requires pointer type and only on the lines that use the int *score; variable (57, 62, 64, 69, 71, and 82). I've already tried adding = nullptr to the variable and that didn't work.
What I want to do is have a defined string as the input and use that to run it against the keys, so I can pull out the values. I have some functions beneath for searching, a possibility would be to parse the input and use something along those lines.
I'm making my way through most of this assignment that I have, but now it seems like I've run into a bit of a roadblock. The issue that I'm having is not being able to printf a series of ints that I thought I had previously defined in another function. I don't want to clog up this post with the entire code, so I'll just post one function that defined an int to give an example. I will upload the whole thing upon request however.
Code:
#include <stdio.h> #include <stdlib.h> //Prototypes int AGrade1(int* grade1); int AGrade2(int* grade2); int AGrade3(int* grade3);
[Code] .....
I've tried many many things, but I just cant figure it out. This is what it's supposed to look like.
Code: #define FOO BAR #if FOO == BAR doX(); #else doY(); #endif
This causes doX(); to be executed. But the intent is to have doY(); be run. I'm guessing this is because BAR is undefined and therefore blank, so blank equals blank. Is there some way to compare the symbol FOO was set to instead of its value, BAR?
I am trying to write a game in C++ with SDL, and I have a class that allows me to handle events. The class is actually really simple: It takes the SDL_Event, then 2 variables from 2 different enum to determine for which Event and which Key should be checked, and then a variable that will be modified if the event happens. Here is the class
As of yet the variable only changes if the Left key has been released, it will be extended if the error has been solved.
Then, in my main.cpp file I define the Event and the EventParser as
SDL_Event event; EventParser<float> ep;
And in a loop, the parseEvent function is called like this: ep.parseEvent(event, ep.KeyUp, ep.LEFT, &xVariable);
However I get a linker error (not the first one I got when programming this game) error LNK2019: unresolved external symbol "public: void __thiscall EventParser<float>::parseEvent(union SDL_Event,enum EventParser<float>::EventType,enum EventParser<float>::KbdKey,float *)" (?parseEvent@?$EventParser@M@@QAEXTSDL_Event@@W4EventType@1@W4KbdKey@1@PAM@Z) referenced in function _SDL_mainC:UsersPrideRageDocumentsVisual Studio 2012ProjectsSDL_TestSDL_Testmain.objSDL_Template
Classes can be defined not only with keyword class, but also with keywords struct and union.
The concepts of class and data structure are so similar that both keywords (struct and class) can be used in C++ to declare classes (i.e. structs can also have function members in C++, not only data members). The only difference between both is that members of classes declared with the keyword struct have public access by default, while members of classes declared with the keyword class have private access. For all other purposes both keywords are equivalent.
The concept of unions is different from that of classes declared with struct and class, since unions only store one data member at a time, but nevertheless they are also classes and can thus also hold function members. The default access in union classes is public.
The above is a statement taken from a C++ tutorial. So I understand classes a bit better now but the above quote doesnt make too much sense. Is it saying that you can have a class within a class?
The instructions call for the user to define the size of the array and all I have ever done is use a predefined size for the array and then let the user fill it. Here is what I have so far:
Is there a way to call a function whose name is defined in a file-stored-list?
In other words: The caller doesn't know in compile time the name of the function.
I'm not talking about polymorphism.
The problem is: I have a list of function names stored in a file, that may change every now and then, and I'd like to call them in the sequence they appear in that list.
I made this code (it does nothing I am just learning about classes, I was learning about friend functions) and I don't understand what is wrong, here is the code:
#include <iostream> #include <cstdlib> #include <cstring> using namespace std; class MyClass { public: friend int add(int a, int B)/>; [Code] ....
I know i didn't need to include cstdlib and cstring for this code but as I said, it's not supposed to be something it's just for practice and I was working on char arrays. My question is about the part where i try to define the function:
int MyClass::add(int a, int B)/> {}
My compiler(Microsoft Visual C++ 2010 Express) says that class MyClass has no member "add" even though it does...
My question is how create a function to remove all vowels defined as characters('a' 'e', 'i', 'o', and 'u') from the array provided to it.
An example of how the function should work:
input: Hello world, how are you? output: Hll wrld, hw r y?
Code: int removeVowels(char arr[]) { int i; //move through each element of the array for(i = j; arr[i] != '/0'; i++) { //if the last character was a vowel replace with the current //character
I need the user to be able to input the number of decimal places they wish to have displayed in the output. Everything works fine as is, I just don't know how to allow for the user to input the number of decimal places they want the output to have.
Code:
#include<stdio.h> #include<math.h> #define PI 3.141592654 int main(void) { //Local Declarations int x; //desired number of decimal places float radius; //radius of circle float circumference; //circumference of circle
I am wondering about the constructor. I see there appears to be nothing inside of TinyGPS::TinyGPS() as far as parameters go and that that declaration is followed by a ":". First I'm wondering as to the meaning of the colon. As well with the variables defined after the ":" I see some "(0)" and I am wondering as well to the exact meaning of the "(0)". Are those variables being defined as parameters separated by ","?
