C++ :: Finding Memory Address For Characters

Sep 9, 2013

I've recently been reading tutorials on arrays and their aquaintance with memory addresses. So, I completely understand how an array's name, when defined, is a constant pointer to its first element's address.

My problem, however, lies with characters, and how they are basically arrays except with a null terminator for the last index. What I've come to undestand, is that, when defining a character variable, each 'character' has a memory address it is associated with.

For example:

char name[] = {"Hello"}; // | 'H' | 'e' | 'l' | 'l' | 'o' | '/0' |

An address holds the value of 'H'.
An address holds the value of 'e'.
An address holds the value of 'l' and so on.

I have come to believe this is false, however. Mainly from a simple std::cout command.

std::cout << &name << std::endl; // attempt 1
std::cout << &name[0] << std::endl; // attempt 2

The first attempt, as I assumed, should print the address of the first element.
The second attempt, as I assumed, did not. I figured, &names[0] would print the address of the first element, which should have been the same as &names.

So, this brings me to my question, are characters formed of constant addresses, or are the address of individual characters not reachable?

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C++ :: Finding The Address Of A Bitfield

Aug 14, 2013

So I obviously can't take the address of a bitfield, but is there a way to get the address of the field holding the bitfield? What I'm trying to do is find the address of the parent field of a bitfield in a class. For example

Code:
class Foo
{
public:
int a;
int b : 4;
int c : 28;
[Code] ....

My goal is to get the offset address of the int storing c in class Foo. But offsetof uses the address of c, so I get a compile error since c is a bitfield. What I wanted as output from the above would be "4", since an int is 4 bytes (on my system). So the int holding both b & c starts 4 bytes from the start of the Foo class. Is there any way to do this in c/c++?

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C++ :: Finding X / Y Pixel Address In Mode 13h VRAM?

Jul 21, 2013

I'm currently working with linear VRAM (a buffer with 256KB memory, divided into four 64k planes, so plane 0 at 0x00000, plane 1 at 0x10000, plane 2 at 0x20000, plane 3 at 0x30000). Just add the index of the plane to that for the full address in VRAM.

I'm still wondering how to get a specific pixel from VRAM (x,y coordinate) when doing graphic modes (none color modes work, only the black/white pixels (1-bit) graphic mode works).

how I can get specific pixels from the VGA VRAM (having linear access described above) using Shift Register Interleave mode (VGA modes 4&5), 16-bit planar mode (Most VGA modes) etc.

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C/C++ :: How To Print The Value At Memory Address

Nov 20, 2012

I have written a C program without variable. And I want to print the value at that memory location.How to print that value?

code is like:-

int main()
 {
     printf("Enter value:");
     scanf("%d",1245024);
     /* how to print the value here */   
 return 0;
 }

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C :: How To Collect Memory Address Of Day To Day Workload

Jan 14, 2014

I am working on something that requires the memory address of my computers workload.. collect the trace files? and what trace file as well..

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C++ :: Pointers Point To Address In Memory

Sep 30, 2013

Pointers point to an address in memory. What if I used 3 pointers: 2 to mark the first/last nodes, and the third to mark the current node being referenced? I would wrap it in a class (to make the memory management automatic, of course), but is this practical?? maybe some pseudo code will get the juices flowing:

template<class type>
class supercondensed_list{
public:
supercondensed_list();
~supercondensed_list();

[code].....

Any things I should take into consideration? I'm not exactly the most experienced with pointers, and manually managing memory, but I think it's worth trying. If this works, then my programs should, in theory, be 100% memory efficient.

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C++ ::  How To Store Memory Address In A Pointer

Apr 29, 2013

What I'm trying to do is:

int *p;
someType memoryLocation;
cout<<"Enter your memory location: ";
cin >> memoryLocation;
p = memoryLocation;
cout << *p;

I was just messing around with some code, and was curious to if this was possible.

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C/C++ :: Result Is Returning Address In Memory

Jun 30, 2014

The results of my code is supposed to be very simple: return the 2 integers and then their sum. However, it's doing returning the first value, then an address in memory(rather than the 2nd value), and then the 2nd value(rather than the sum). Here is the code:

#include <stdio.h>
#include <stdlib.h>
struct calculator{
double num1;
double num2;
double result;

[Code] .....

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C :: How To Get Memory Address Of A File In Hard Disk

Sep 12, 2013

I made a text file. I can do all File I/O functions in c. no problem! except that "I want to get the memory address of the beginning of that File", so that I can access each character of the file by incrementing memory address.

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C++ :: Integer Pointer - Get Address Without Allocating Memory

Jun 3, 2013

I have an integer pointer and i want its address without allocating memory,

main() {
int *a;
cout<<a;
}

This is giving 00000000 and its but obvious. Now if i use address of a (&a) along with *a,

main() {
int *a;
cout<<a;
cout<<&a;
}

'cout<<a' gives me a constant address but 'cout<<&a' gives me different address.

what is the reason behind & and why behaviour of 'cout<<a' changes when using with &.

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C++ :: How To Check And Allocate Memory From Given Address Range

Jan 2, 2013

A special hardware unit with some storage in it is connected to your computer and is memory-mapped so that its storage is accessible in the address range 0x55500000 – 0x555fffff. You want to interface this hardware unit to your C++ program so that dynamic memory is allocated in this hardware unit, not in your computer’s memory. Implement a class MyHardwareMemAllocator which has the following function.

void * allocMemoryInMyHardware(int numberOfBytesToAllocate);

which returns a pointer to the allocated memory chunk, or null if unable to allocate.

C library calls like malloc are not allowed.

1) How to allocate memory from given address range.
2) How to check whether this required memory space is available or not for allocating

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C++ :: Memory Address Of Class Member Variables?

Jun 22, 2013

Suppose I have two classes, MyClassX and MyClassY, each with two member variables, as defined below. I create an object instance of each class, and then create a pointer to each member variable for each object:

Code:
class MyClassX
{
public:
int a;
double b;
MyClassX(int _a, double _b)

[code]....

After converting the hexadecimal to decimal, it appears that with MyClassX, pxb is 8 bytes from pxa, whereas for MyClassY, pya is only 4 bytes from pyb. This makes sense for MyClassY, because the first member variable to be stored is an int, and so will occupy 4 bytes. However, why should this be any different for MyClassX, which also has an int as the first member variable, so shouldn't this also occupy 4bytes?

The reason I have come across this problem is that I am looking into streaming objects to memory and then loading them again. (I know boost can do this, but I am trying it out myself from scratch.) Therefore, this is causing an issue, because I cannot just assume that the size of memory occupied by an object is just the sum of the sizes of its member variables. MyClassX is 8 bytes larger than MyClassY, even though the intuition is that it should only occupy 4 bytes more due to a double being replaced by an int.

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C :: Is Extra Memory Allocated For Storing Address Of Array

Jul 8, 2014

When declaring char array[10], memory is allocated for 10 1-bit memory locations. Is extra memory allocated for storing the address of array[0]? In expressions, is array equivalent to a pointer constant or is it an identifier for a memory cell containing the address of array[0]? In other words, is array a variable or an alias for &array[0]?

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Feb 3, 2014

I am looking for a way to correctly count the lines between two specified characters/strings in a file. Here's the part I need work on:

getline( file, lines );
do {
if(lines.find("character")
{
++counter;
}
} while( !lines.find("story") );

I want the code to search for the first occurence of the word "character," and start counting the lines from that line until it hit the first occurrence of the word "story."

Right now, I am only getting a counter value of 1.

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C++ :: Finding If String Has Unique Characters

Mar 28, 2013

bool isUnique(string _str)
{
bool char_set[256];
int len = _str.length();
memset(char_set, '/0', 256);
for(int i = 0; i < len; ++i)

[Code] .....

I came across this code to find if string has unique characters...i didnt understand why they subracted ascii value of character '0' in the statement int val = _str[i]- '0' and what is happening with the statements...

if(char_set[val])
{
return false;
}
char_set[val] = true;

I take each character in the sting and traverse the whole string .and if count is 2 i use break and conclude that its not unique and not otherwise...can i use this method or this is not efficient????

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C++ :: Overloading Stream Operator - Return Memory Address Instead Object

Jul 26, 2012

Try to implement overloading << operator. If I done it void then everything work fine (see comment out) if I make it class of ostream& then the operator return to me some memory address.

Code:
#ifndef Point_HPP // anti multiply including gates
#define Point_HPP
#include <sstream>
class Point {
private:// declaration of private data members
double x;// X coordinate
double y;// Y coordinate

[Code] .....

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C/C++ :: Finding Highest Frequency From Array Of Characters

Jan 27, 2015

I have been working on a project that deals with an array of characters and finding there frequencies. I was able to determine the frequencies that where greater than 1, but I need to find the HIGHEST frequency.

Here is my full code:

#include <iostream>
using namespace std;
void input(char unlisted[80], int& n);
void bubblesort(char unlisted[80], char sortedlist[80], int n);

[Code].....

As you can see this will print out all frequencies that are bigger than 1, but I only want the highest frequency. Basically I want to print out all frequencies when count is greater than 1 less than count, but because its in a loop count will always be greater than count-1 so it prints out all frequencies.

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Feb 5, 2014

I need to find a string(&login=) from physical memory dump file.And i have to print the word or string following it.Is there any C# code for this problem?

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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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Jul 6, 2014

Im supposed to find the common characters between two string characters, assuming that the user wont input duplicate letters like ddog. When I run my code I get an output of a question mark upside down. Here is my code with comments on what each part is supposed to do

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(){
char str1[20], str2[20],remp = '';
int size1,i,j,temp;
printf ("Input the first string");

[Code]...

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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++ :: Are Reference And Address Same

Aug 2, 2014

Are Reference and Address same or Different?

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C++ :: Output Is Showing Address Instead Of Value

Dec 7, 2013

I've run across this issue before, but for the like of me, I can't figure out what keeps causing it. The problem compiles and runs as expected; however in the salaried object (Employee #1 in main.cpp) the console displays the number of vacation days as -858993460 instead of the value entered.

The parent Employee class is abstract with calculatePay() and displayEmployee() being pure virtualls and with a Benefits, Salaried, and Hourly class derived from it.

The Salaried displayEmployee() and the portion of the Main.cpp that contains the salaried object follows. What causing this?

Salaried displayEmployee()
Code:
void Salaried::displayEmployee()
{
cout << endl;
cout << "Employee Information" << endl;
cout << "----------------------------------" << endl;
cout << "Employee Name: " << setw(7) << FirstName << " " << LastName << endl;
cout << "Gender: " << setw(12) << Gender << endl;

[Code] .....

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C :: Display Address Of A Pointer

Jan 31, 2014

I've got a problem with a piece of code that it doesn't seem to work anymore.

Code:
#include <stdio.h>
#include <conio.h>
main () {

[Code] ..... i

I chose a to be 5 and it displays the following:

"Type a value for a:
5
5 in octal is: 5
5 in hexadecimal is: 5

Process returned 23 <0x17> execution time : 1.031 s".I first saw this when trying to display the address of a pointer. Am i missing something? I used to run this code on dev-c++ successfully but after a day or so of practice, it's not working anymore. I switched from dev-c++ to code blocks.

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Oct 1, 2012

So im trying to parse a string into a Ip Address but i have a problem, the IPAddress.Parse method only works for ipv4 address's how do i parse ANY Ip address into a string, if i use the IPaddress.Parse method on my public(remote) IP it throws an exception but on ipv4 local ip it doesn't how do i parse ANY ip address the user inputs as a string as an Ip Address?

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Jun 21, 2014

C++: write a c++ program that will display your name, address and age..

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