C++ :: Assigning Physical Values To Pointers In VC++?

Sep 9, 2013

The problem may only apply to VC++ compiler - ??.

Cannot do this:

const unsigned int Port = 0x900E0000;
unsigned int *pData = Port; //Error - can't convert from int to int*.

Solution:

const unsigned int PORT = 0x900E0000;
const unsigned int PORT_PTR = ((unsigned int *)0x900E0000);
unsigned int *pData = PORT_PTR; //No Error.

I found no way to do it but the above.

Ex., you cannot do:

pData = (unsigned int *)0x900E0000;

View 1 Replies


ADVERTISEMENT

C++ :: Why Asterisk Required On Smart Pointers For Assigning Value

May 19, 2013

When i try to compile this code it gives me a error during run-time saying "*program name* has stopped working"

Code:
#include <iostream>
#include <memory>
using std::cout;
using std::endl;
using std::unique_ptr;

[Code] .....

Why is this happening? Also why do you need the asterisk on smart pointers to assign them a value? Is it just because, or is there a reason.

View 5 Replies View Related

C/C++ :: Assigning Functions To Array Of Function Pointers

May 13, 2013

I'm trying to create an array of function pointers and then assign compartilbe functions to them, so I can just call *pf[0](xxx);

The functions are all of the type

void func01(unsigned char*, int, int)

how would I create an array of function pointers and assign the address of the functions to them? So I could call them like

ptrToFunction[i](charBuffer, 10, 20);

I've read a bit on line and I thought I could do it but so far I've failed.

It seems trivial and I feel I'm close but close isn't good enough.

I'd like to assign the fuction addresses like this:
for (int i=0; i<10; i++)
if (i==1)
ptrToFunction[i]=func01;
if (i==2)
ptrToFunction[i]=func02;
etc.

The actual logic is somewhat different than this but this close.

View 4 Replies View Related

C :: Sorting Arrays Of Pointers - Assigning Data To Gene

Feb 11, 2013

Code:
typedef struct {
name_t name;
float beta[beta_num];
} gene_t;

[Code] ....

Is gene an array of address ? How come the compare function doesn't work ?

View 1 Replies View Related

C++ :: Assigning Values To Arrays

Apr 13, 2013

Here is the code:

#include <iostream>
using namespace std;
int main(int argc, char * argv[])
{
double foo [5][5];

This is the warning:warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x...It's referring to the boldened part.

View 1 Replies View Related

C++ :: Assigning Values To Union?

Sep 10, 2012

I have the following C++ code

typedef union UUID {
unsigned char byte[16]; /**< Array of 16 bytes. */
unsigned int ll[2]; /**< Array of two 64-bit words. */
} UUID;

[Code] ......

The compiler complains thus

$ g++ union.cpp
union.cpp: In function "int main()":
union.cpp:15:17: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x
union.cpp:15:17: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x
union.cpp:15:17: error: no match for "operator=" in "entry.EntryHeader::uuid = {0, 0, 0, 2}"
union.cpp:1:20: note: candidate is: UUID& UUID:perator=(const UUID&)

How do I go about assigning values to this union in C++.

View 3 Replies View Related

C++ :: Assigning Values To Two Dimensional Array

Feb 18, 2014

I'm trying to write a very simple program that takes values in through variables, and stores those values in a two dimensional array. The values are already passed into the void function, I need to have those values write to their corresponding locations in the array.

void planeSeats(int seats[13][6], int ticket, int ticketRow, int ticketColumn) {
if (ticket = 1) {
if (ticketRow >= 1 && ticketRow <= 2) {

[Code] ....

For example, lets say that ticketrow is 2 and ticket Column is 4 .

What I need is for ticketRow and ticketColumn to assign that data to seat[ticketRow][ticketColumn], turning it into seat[2][4]. How to do that.

View 2 Replies View Related

C++ :: Assigning List Of Values To Vector?

Mar 30, 2013

I am trying to assign a list of values to a vector:

vector<string> words;
words[] = {"one", "two", "three"};

This does not work. How can I accomplish it?

View 5 Replies View Related

C++ ::  accessing / Assigning Values Of A 5 Dimensional Array

Feb 8, 2014

I'm okay with 2-dimensional arrays, but when I get to 3 or more, I can't seem to wrap my head around how to assign and/or pull values from specific parts.

To give an example, let's take the following example:

We know that a player can take up to 5 total quests, and each quest can have a max of 5 tasks.

Let's assume I have the following multi-dimensional array holding all of a players quest data:

quests[0] = 78;// Store the questID
quests[0][0] = 3945;// Store the 1st creature ID
quests[0][1] = 2230;// Store the 2nd creature ID
quests[0][2] = 3045;// Store the 3rd creature ID
quests[0][0][0] = 2;// Store how many needed of the 1st creature
quests[0][1][0] = 5;// Store how many needed of the 2nd creature
quests[0][2][0] = 13;// Store how many needed of the 3rd creature

As we know, the above code can't be done. How do I assign certain values to each specific dimension?

View 6 Replies View Related

C/C++ :: Assigning Current Date To Integer Values

Sep 26, 2014

How can i assign current date as integer ?

for example:

today's date 26 Sep 2014 on a computer
i try to make as below
int day=26
int moth=9
int year=2014

I also research i think i will use time.h library surely

View 3 Replies View Related

Visual C++ :: Assigning Values To And Extracting Them From A Vector

Nov 28, 2012

I am writing a program to play rock paper scissors, and I am trying to get a vector to store the result of a given round of play, and output it as a declaration as to who won. I can't figure out how to store the values in the vector properly, and how to use the vector as an argument to output the result of play.

Code:
#include <iostream>
#include <iomanip>
#include <ctime>
#include <vector>
#include <cstdlib>
#include <string>
using namespace std;
const string name[4] = {" ", "rock", "paper", "scissors"};
const string roundResult[3] = {"computer win", "player win", "tie"};

[Code]....

View 1 Replies View Related

C :: Reading Values From File To First 2 Columns Of 2D Array / Assigning 0 To 3rd Column

Apr 4, 2014

I am attempting to read values from a file into a 2d array temp[31][2] (31 rows, 3 columns).I only want the values from the file to be read into the first two columns.I believe I am accomplishing that but when I go to print the array, I expect the first two columns to have the file data and the third column to have all zeros. The third column, however is printing such that the value is the next row/first column.

I'm not sure for instance why on the bottom loop for line 1 it doesn't print:

temp[0][0] temp[0][1] temp[0][2] 20 49 0 It instead prints: 20 49 1

Code:

#include <stdio.h> Code: #include <math.h>
FILE *inptr;
int main() {
int temp[31][2] = {0}, tempavg[31][2] = {0};
int i, j, k, sum;
inptr = fopen("ProgrammingProject14.txt", "r");

[code]....

View 8 Replies View Related

C++ :: Unsigned Char Array - Assigning Values Converted From Double

Aug 3, 2014

I'm having a pretty weird problem. I've created an unsigned char array for an image buffer:

buffer_rgb = new unsigned char[_w * _h * 3];
memset(buffer_rgb, 0x0, sizeof(unsigned char)* _w * _h * 3);

And I add pixel color values to it like so:

buffer_rgb[i] = ((unsigned char)(col[0] * 255));
buffer_rgb[i + 1] = ((unsigned char)(col[1] * 255));
buffer_rgb[i + 2] = ((unsigned char)(col[2] * 255));

Where col is a 'vec4' struct with a double[4] with values between 0 and 1 (this is checked and clamped elsewhere, and the output is safely within bounds). This is basically used to store rgb and intensity values.

Now, when I add a constant integer as a pixel value, i.e.:

buffer_rgb[i] = ((unsigned char)255;

Everything works as it should. However, when I use the above code, where col is different for every sample sent to the buffer, the resulting image becomes skewed in a weird way, as if the buffer writing is becoming offset as it goes.

These two images illustrate the problem:

tomsvilans.com/temp/140803_render_skew.png
tomsvilans.com/temp/140803_render_noskew.png

You can see in the 'noskew' image all pixels are the same value, from just using an unchanging int to set them. It seems to work with any value between 0-255 but fails only when this value is pulled from my changing col array.

Whole function is here:

// adds sample to pixel. coordinates must be between (-1,1)
void Frame::addSample(vec4 col, double contrib, double x, double y) {
if (x < -1 || x >= 1 || y < -_aaspect || y >= _aaspect) {

[Code] .....

View 1 Replies View Related

C :: Setting Values To Pointers

Apr 5, 2014

This function below takes a pointer as an argument. What I expect to happen is, since expr++ has higher precedence than *expr, that is, the primary expression operators have higher precedence than the unary operators, pointer arithmetic should occur where we increment to the second address pointed to by dbuf, and then we should dereference the value at that address. Given that logiv, when i print dbuf[3] it should print the value pointed to at the 4th address in dbuf. However, the value it returns is 0x0 not 0x3. Why doesn't it dereference the value 0x3?

Code: void dfill(unsigned char *dbuf)
{
dbuf = (unsigned char*)malloc(4);
memset(dbuf, 0, 4);
*dbuf = 0x0;
*dbuf++ = 0x1;
*dbuf++ = 0x2;
*dbuf++ = 0x3;
printf("dbuf val: 0x%x
", dbuf[3]);
}

View 1 Replies View Related

C Sharp :: Finding String From Physical Memory Dump File (RAW File)?

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?

View 3 Replies View Related

C :: Assigning Values To Arrays / Printing Arrays

Jul 1, 2014

Using a for loop, construct two 100 element arrays, x and y, such that element i of x stores the value sin(2*pi*i/100)) and the corresponding element of y stores cos((2*pi*i/100)). Print the values stored in the elements of x and y as you calculate them.

I have attempted to solve it but I'm not sure why the value 0 is only being printed, maybe I haven't assigned sin(2i/100)) and cos((2i/100)) to the arrays properly?

Code:
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main () {

[Code] .....

View 3 Replies View Related

C++ :: Initializing Pointers To Memory Addresses Or Values?

Aug 31, 2014

What is the difference between initializing pointers to a memory address using the address operator like int *pointer = &x; or initializing it to a value like int *pointer = x; .. in other words how does p and q point to the same memory address in:

const int ARRAY_LEN = 100;
int arr [ ARRAY_LEN ];
int *p = arr;
int *q = &arr[0];

View 4 Replies View Related

C++ :: MergeSort With Sentinels And Order Pointers Not Values

Apr 20, 2014

I'd like to do a MergeSort with sentinels and order the pointers, not the values!

#include <iostream>
#include <limits>
using namespace std;
void
stampa (int *n) {
int i;
for (i = 0; i < 10; i++) {

[Code] .....

View 9 Replies View Related

C++ :: Passing Data Structures To Function Pointers And Get Values

Sep 26, 2014

typedef struct example_dt_struct {
int a;
float b;
char* c;
};
typedef void(*func)(example_dt_struct *s, int e, int f);
void f(func *n){}

how can i use example_dt_structure with my function pointer into f()

View 5 Replies View Related

C++ :: Correct Values Passed To The Pointers - Memory Corruption

Apr 26, 2012

My project is say that it has memory leaks. When I view it in the debugger, it shows the correct values being passed to the pointers.

Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
bool ConfigGetEntry( char *pcFile, char *pcNameMust, char* &pcResult ) {
char pcBuffer[ 512 ];

[Code] ....

Its saying that i have memory corrupting at..

Code:
if ( !ConfigGetEntry( pcFile, pcName, pcRet ) ) return _strdup( pcDefault );

Also is it normal to have a bad pointer then point data into it to then clear that of the bad pointer. To have valid data now in that pointer.

View 3 Replies View Related

C++ :: Returning Values Or Using Pointers To Redefine Variables Passed As Arguments?

Feb 28, 2014

Which is more efficient in functions? Returning values or using pointers to redefine variables passed as arguments?

I mean either using:

void ptr_Func(int *x)
{
*x = *x+1
}

or

int ptr_Func(int x)
{
return x + 1;
}

In terms of speed, memory use etc.I want to know general efficiency, I know it will obviously vary with different uses and circumstances.

View 7 Replies View Related

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..

View 4 Replies View Related

C++ :: Comparing Char Pointers To Integer Pointers

May 21, 2013

I am a little confused while comparing char pointers to integer pointers. Here is the problem:

Consider the following statement;
char *ptr = "Hello";
char cArr[] = "Hello";

When I do cout << ptr; it prints Hello, same is the case with the statement
cout << cArr;

As ptr and cArr are pointers, they should print addresses rather than contents, but if I have an interger array i.e.
int iArr[] = {1, 2, 3};

If I cout << iArr; it displays the expected result(i.e. prints address) but pointers to character array while outputting doesn't show the address but shows the contents, Why??

View 2 Replies View Related

C++ :: Assigning Bits A Value Of 0

Feb 12, 2014

I am having a problem assigning bits a value of 0. The data is a 16 bit integer the bits greater than the 12th bit have garbage either a 0 or a 1. I would like to assign all bits greater than 12th bit the value 0 no matter what their values are. Whats the best approach.

View 5 Replies View Related

C :: Assigning Value To Char Pointer

Feb 3, 2013

I thought we needed to allocate memory before assigning a value to a char* and also that we needed to use functions like strcpy() to copy something into it. Then how come this works and does not crash?

Code:
#include <iostream>
using namespace std;
int main()
{
char * buf;
buf = "Hello";
cout << buf << endl;
buf = "World!!!!!!!!";
cout << buf << endl;
return 0;
}

View 3 Replies View Related

C :: Assigning Value During Pointer Declaration

Aug 31, 2013

I am trying to understand the behavior of following code. Basically how does printf() prints the value rather than address.

Does initializing value to a pointer during declaration makes a difference when assigned from a variable?

Code:

1 #include <stdio.h>
2
3 int main() {
4 const char *var1 = 'A';
5 int *vint = 10;

[Code] ....

View 8 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved