C/C++ :: How To Initialize Array Of Pointers To Array Of Characters

May 21, 2014

I am trying to initialize an array of pointers to an array of characters, I can do it in 3 lines but I really want to do it in one line at the same time keeping the #define.

3 lines initialization (can compile)
======================
#define A 1
#define B 2
char row1[] = {A|B, B, A};
char row2[] = {B, A};
char *test[]= {row1, row2};

1 line initialization (failed)
===============================
char *test[] = { {A|B, B, A}, {B, A} }; // <- how do i do this??

I do not want this because it waste ROM space
=============================================
char test[][3] = { {A|B, B, A}, {B, A} };

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C++ :: Vector Of Void Pointers Which Point To Array Of Characters

Jan 21, 2014

This code work perfectly, as follows.

Code #A:

#include <iostream>
#include <cstring>
#include <vector>
using namespace std;
typedef std::vector <void *> gr_vector_void_star;
gr_vector_void_star output_items;

[Code] .....

Output of above code #A:

char * sentence = "Angel";
for (int i=0; i < 5; i++)
{ out[i] = sentence[i]; } // error: invalid conversion from 'char' to 'char*' [-fpermissive]

It fails to compile with error message "invalid conversion from 'char' to 'char*'".

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C :: Create Array Of Pointers To Pointers Which Will Point To Array Of Pointers

Feb 28, 2014

I'm trying to create an array of pointers to pointers which will point to array of pointers (to strings) I tried

Code:

int i;
char *string[]={
"my name is dave",
"we like to dance together",
"sunny day",
"hello",

[code]...

the app keeps crashing , I don't know how to make the array-elements to point to another array-elements..

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C++ :: Why Can Initialize Array Nested In Structure Like Array

Feb 7, 2015

Example :
Code:
struct x {
int v[4];
};
const x test = { 0, 1, 2, 3 };

Why can I do this? How does the compiler know to write to this in the proper way? I get that v would be contiguous. Does that have something to do with it?

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C++ :: Using Loop To Process Array Of Characters Starting From Beginning Of Array?

May 3, 2014

Assume you want to use a loop to process an array of characters starting from the beginning of the array. You want the loop to stop when you read the null terminator character from the array. Fill in the loop test condition that will make this work correctly.

index = 0;
ch = array[index];
while ( _____________________________)
{
// process the character
index++;
ch = array[index];
}

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C :: How To Print Characters But No String Just Array Of Characters

Mar 20, 2014

so my question is i want to print characters,no string just an array of characters,i do this but it s not working,maybe i have to put the '' at the end?

Code:

int main() {
int i;
char ch[5];
for(i = 0; i < 5; i++) {
scanf("%c",&ch[i]);

[Code]...

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C++ :: Initialize Array In A Constructor?

Dec 6, 2013

There are two class.How can I initialize an array of different class in a constructor?

class Ticket{
private:
int ID;

[Code]....

I have to provide a no-argument constructor (Cinema();)to initialize the ticket array and give the right ticket ID.

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C/C++ :: Initialize Array With Tiles?

May 8, 2014

imagine you have a world class. Than you have a tile class. Now, in the world class is a array with a lot of tiles and I want to initialize them with my imagination(For example I want a grass floor). But how I can do this, the array can only be create with the standard constructor. But it would be stupid and not very fast, that the tiles are first initialized with the standard constructor and than overridden to build the world. Whats the best way to initialize such a array ?

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C++ :: Changing Array Of Characters To A String Array?

Apr 7, 2013

I have an array titled: char TypeOfSong[arraySize] where the array size is 15. I am reading data from a file into this array and the characters can be either 'C', 'D', 'E', or 'R'. Each of these characters stands for a word (sting) and when I output the array, I need the strings to show up, not the characters. I have been reading online and in my book but I can only find information on turning one array with the same characters into a string. How would I go about changing this character array with different characters into a sting?

The characters stand for:

C = Country
D = Dance Party
E = Elevator
R = Rock

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C/C++ :: Testing Character Array Against Array Of Characters?

Apr 16, 2014

I am currently having an issue with validating user input for a state abbreviation. I have an array where a list of abbreviations is stored to use as a comparison for whatever the user inputs. I have been able to get the list loaded properly but whenever i go to compare, it always comes back as true even if it isn't. Here is some relevant code:

static char stateTable[STATE_TABLE_SIZE][STATE_SIZE];
int main() {
char buffer[40], *testCustName[40], testState[5], testCode;
buffer[0] = '';
int quit = 0;
int p = 0;

[code].....

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C++ :: Allocating Array Of Pointers To Dynamically Allocated Array?

Jan 18, 2014

I'm trying extremely hard to understand pointers and I have the basic concept down.. I feel as though my knowledge of dynamically allocated pointers and pointers in general is not enough to understand the logic behind what I'm trying to do. The problem is that the donations array must be able to accept any number of donations. I've made it do just that, but there is also an array of pointers which must each point to the same element in the donations array. The program works if I assign int *arrPtr[100] for example, but it does not work if I try to dynamically allocate it to accept the same number of elements for donations entered by the user. Here it's the snippet

#include <iostream>
using namespace std;
//Function Prototypes

[Code]....

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C++ :: How To Take Size Of Array And Initialize It On Heap

Feb 6, 2014

I am creating a class that has a private array on the heap with a constructor that takes the size of the array and initializes it on the heap. Later I have to make a deconstructor delete the space and print out free after.In my code, I was able to heap a private array and make a deconstructor, but I don't know how to take the size of the array and initialize it on the heap. My guess is this:

int* size = new int();

Also when you initialize size on the heap, don't you also have to delete it too? If so, where, in the code, do you do that? Here is my code so far.

Class Student {
private:
int size;
int* array = new int[size];
public:
Student(); // Constructor
~Student(); // Deconstructor

[code]....

How do you make a constructor that takes the size of the array and initializes it on the heap

Student::~Student()
{
delete[] array;
cout << "Free!" << endl;
}

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C++ :: Can't Initialize String Array In Constructor

Jul 22, 2013

I am currently practicing designing classes. In one exercise, I am trying to store 15 words in an array, and randomly print one (using the rand() functions and seeding it with crime. I have a header file, a respective .cpp file, and a main .cpp file. When I try to compile the code using g++ GuessWord.cpp UseGuessWord.cpp -o UseGuessWord, I get the following error in my constructor: expected primary-expression before ‘{’ token

Here is my code:

header file (GuessWord.h):
#ifndef GUESSWORD
#define GUESSWORD
#include <string>
using namespace std;

[code].....

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C++ ::  How To Initialize Function Prototype Of Array With Zero

Apr 23, 2014

We can initialize normal function prototype's parameters with zero like this:-

void output(float = 0.0, int = 0);

or

void output(int = 0, int = 0, double = 0.0);

But how do you do the same for a pointer array or simply an array?

Assume that second parameter has to be an array.

I have tried the following and it does not work:-

void output(float = 0.0, int = 0);
void output(float = 0.0, *int = 0);
void output(float = 0.0, int* = 0);
void output(float = 0.0, int[] = 0);
void output(float = 0.0, int []);

But if I skip the default declarations altogether, it works.

like:

void output(float, int []);

or

void output(float, int*);

how can I do it by explicitly writing zero, just like the first cases?

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C/C++ :: String Out Of Bound - How To Initialize Array

Mar 7, 2014

I'm a newbie to C++ and I am writing a code that searches strings and checks their value. I'm mostly working with if statements.

My code tends crash on Dev C++, even when I haven't recently saved any changes or compiled it, citing "memory access errors".

I recompiled in visual studio, and visual studio told me I have string out of bound errors.

My code is very long... but most of it is copy and pasted with slightly different conditions.

I believe the problem lies in how I initialize arr[4] ??

#include <cstdlib>
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main() {
cout << "Hall symbol -- generator matrix program" << endl;
// Setting up a data structure bc a normal array cannot handle the data for the spacegroups

[Code] ....

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C/C++ :: Constructor To Initialize Each Members Of Array?

May 3, 2014

Need a C++ constructor to initialize each members of an array. how to give value for for each elements of an array declared as a class object according to the users input.

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C/C++ :: How To Initialize Array Of Structures At Runtime

Aug 26, 2014

I somewhere read "You cannot initialize a structure like that at run time."

Example:
struct item_info {
      char itemname[15];
      int quantity;
      float retail;
      float wholesale;

[Code] ....

But if you want to assign values at run time then you have to do it manually like:

strcpy(item[0].itemname, "rice");
item[0].quantity = 10;
item[0].retail = 40;
item[0].wholesale = 30;

I tried in internet but am unable to know the differences. I want to know the difference between those two in terms of run time and compile time. Explanation required also for below one. Is this run time or compile time? How does we actually decide which is run time and which is compile time!

struct item_info {
      char itemname[15];
      int quantity;
      float retail;
      float wholesale;
      //int quatityonorder;

[Code] ....

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C++ :: How To Initialize Array Of DirectX9 Objects

Jan 3, 2015

I've got an error saying that there is an access violation at 0x0000040 error no 0xC0000005

I've searched the net, saying the error may be due to an uninitialzed variable.I debugged the code, and found out that an object created from directx D3DXMATRIXA16 is uninitialized.With values ??,??,?? in each element

pMeshContainer->pBoneMatrices = new D3DXMATRIXA16[g_NumBoneMatricesMax];

here, pMeshContainer is a variable passed into a function called GenerateSkinnedMesh by pointer

GenerateSkinnedMesh(..., D3DXMESHCONTAINER_DERIVED *pMeshContainer)

Then in turn, GenerateSkinnedMesh is called within a callback from a DirectX9 API called

ID3DXAllocateHierarchy

Code:
class CAllocateHierarchy : public ID3DXAllocateHierarchy {
public:
STDMETHOD( CreateFrame )( THIS_ LPCSTR Name, LPD3DXFRAME *ppNewFrame );
STDMETHOD( CreateMeshContainer )( THIS_
LPCSTR Name,

[code]....

when the method CreateMeshContainer finished execution, the meshContainer is passed back to its parent like this

*ppMeshContainer = pMeshContainer;

The whole meshContainer stuff is stored persistently inside the frame root wrapped within a class called CMesh So in that process, I haven't initialized pBoneMatrices in anyways. But what and where is the best way to initialize an array of DirectX9 objects.

There is a function called

D3DXMatrixIdentity(&...);

But how can I initialize each one of them with this call?

Notice that pMeshContainer->pBoneMatrices does contain a valid address, despite the fact that the elements inside it are never initialized...

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C :: Initialize Array Values With 0s Or Assume They Will Be Initialized To 0

Apr 7, 2014

The following:

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[]) {
int i;
int arr[3];

[Code] ....

Notice we didn't set a value for second index but it returns 0. Should I assume that when declaring an array with n values, those values will be initialized to 0 automatically or should I still initialize the array with all 0s doing something like this:

Code:
for(i=0;i<sizeof(arr);i++) {
arr[i]=0;
}

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C :: Initialize Dynamically Allocated Array Of Integers To Zero?

Jun 22, 2013

Suppose I wished to initialize a dynamically allocated array of integers to zero. Would I do better to use calloc() or malloc + iterate over all entries setting each to zero? Which one is regarded as a better approach?

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C :: Initialize 1D Or 2D Array In Shared Memory (POSIX)

Dec 8, 2014

I am trying to initialize a 2D char array of strings into POSIX shared memory to be shared between 3 other processes. There are plenty of tutorials on how to use a pointer to share a single string or an integer between processes, but I could find no examples on how to initialize 1D or 2D arrays using mmap(). I have posted what I have so far below. It is the first program, which creates the shared memory object and initialize the array char files[20][2][100] with the value files[0][0][0] = ''. What is the proper method to initialize and share an array in C?

(program initializes shared memory object and array)

Code:
#include<fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/mman.h>

int main (int argc, char *argv[]){

[Code] ......

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C++ :: Initialize Char Pointer Array In Struct

Nov 28, 2014

I am trying to store data in a struct to be able to read it latter . have problems initializing this.

struct FoodAndDrink {
struct Food {
char* CannedGoods[2] = {
"Canned Spaghetti",
"Canned Tuna",

[code] .....

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Visual C++ :: Initialize Constructor In Array Of Objects?

Oct 28, 2012

What the best way to initialize a constructor in an array of objects?

Usually I declare an array of objects like so:

Code:
Car toyota[100];

Is this the only way I know to initialize a constructor of an array:

Code:
for (int i = 0; i < 100; i++)
{
toyota[i] = Car(x, y);
}

Is this the proper way?

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C/C++ :: Check For Set Of Characters In Array Of Characters?

Mar 26, 2014

I have an array of characters. I am trying to find "houston". The only way I can think of to do this is to use a for loop and check each individual character. Is there an easier way to do this?

char string[] = "Fishing tourism miami atlanta dallas houston";

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C++ :: Function To Initialize Double Data Array Element To 0.0

Apr 25, 2013

ok here is the question: Write a function that will initialize a double data array element to 0.0 ?

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C++ :: Two Dimensional Array - Cannot Initialize When Parameters Are Decided By User

Nov 4, 2013

I have a two dimensional array , who's parameters are decided by the user . Hence i cannot initialize it . Now i want to take input for the first the row and then check some condition and then move on and take input for the next row.

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