Programming :: Pointer Vs Array Declaration?
Jul 26, 2010Whats the practical diffrens between these declarations in c?
char *a_str = "hello";
char a_str[] = "hello";
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Programming :: Pointer To Array Of Integers?
Aug 23, 2009Code:
#include <stdio.h>
int main ()
[code]...
Programming :: C++ Find Size Of Array, Through Pointer?
Mar 10, 2009i am trying to find the size of an array, not by using the array as a parameter to "sizeof", but by using a pointer -pointing to the array- as a parameter. How do i do this?I use a 32-bit PC.Here's:
Code:
#include <string>
#include <iostream>
[code]...
Programming :: C String As An Array Of Chars And As A Pointer To Char?
May 13, 2009Please look at the comments
Code:
/*
* TEST CASE TO CHECK DIFFERENCES BETWEEN STRING AS
[code]...
Programming :: Point A Char Pointer To A Part Of Another Char Array?
Nov 4, 2010Programming in C.I have two char arrays.char buf1[1024];char buf2[1024];Aren't buf1 and buf2 also pointers?I read in 1024 bytes into buf1 which contain about 300 bytes of characters with newlines. The data is basically a few English sentences. I'm trying to scan buf1 for newlines and then stop at the 1st newline and copy the rest of the data from that 1st newline into buf2.So I run a for loop to look for that new line.
Code:
for(i=0; i<1024;i++) {
if((strcmp(&buf1[i], "
[code]...
General :: Use Pointer To An Array Of Pointers On CPP?
Jun 15, 2010I'm trying to list some information of my database. To do that I'm using a class(MyClassDao) that will do all the SQL stuff and returns to me a list of objects with the content of my table (each row = one object). The problem is: my list gets only the first object... on the second index I'm getting 'segfault'.Can someone post something to help me (link, reference or example)?The call for the list function is:
Code:
MyClassDao* mcd = new MyClassDao();
MyClass** myClassList;
[code]...
Programming :: Pointer To Pointer Segmentation Fault?
Jun 27, 2009I have been googling trying to fix this ... basicly I have a (int **) variable, and when I try to pass a (int) value to a specific position, I have seg.fault.Resuming what I have is:
int ** p;
p[0][0] = 1; //segmentation fault
Programming :: QWebView, Forward Declaration, "error: Forward Declaration Of 'struct QWebView'"?
Dec 28, 2010I am trying to include a QWebView widget in my application. Every time I try to compile it, I just get these errors:
Code:
$ LANG=en_US make
g++ -c -pipe -O2 -march=i486 -mtune=i686 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_WEBKIT_LIB -DQT_GUI_LIB -
[code].....
Programming :: Declaration A Variable In One File And Initializing In Another?
Nov 25, 2010I made 2 files which are different from the program above one is temp1.h and another is temp2.c to understand how extern is used. So here is temp1.h
Code:
#include<stdlib.h>
typedef struct node * bond;
extern int jk;
and temp2.c is
Code:
#include<stdio.h>
#include<temp1.h>
struct node {
int data;
[code]...
I had declared jk in temp1.h as an extern int so why can I not initialize it in temp2.c?
Programming :: IDE Features: Function Declaration In Info Bubbles?
Jun 3, 2009I can't remember what it's called, but this feature of VC++ basically catalogs all the functions of a project, lets you right click on a function and go directly to it's declaration or definition, do not pass go, do not collect 200 dollars. it also gives you an info bubble of the variable types as you're typing a function's name.
this is a very convenient feature, and I'd like to use it with KDevelop, or really any full C++ IDE for linux. does such a thing exist?
Programming :: C++ Multiple Variable Declaration Error - Even After I Set #ifndef Preprocessor
Jan 18, 2011Why do I still get mutiple definition of "_my_variable" error even after I used the #ifndef preprocessor in my hpp file?
This is my scenario
I have:
1. A.cpp (including X.hpp)
2. B.cpp (including X.hpp)
3. X.hpp
[Code]...
Programming :: C Realloc Resize Array / Delete And Add Information Into The Array?
Mar 6, 2011I am trying to dynamically delete and add information into the array "blah"
Code:
int blahsize = 1;
char** blah = (char**) calloc(blahsize+1,sizeof(char*));
Adding information:
Code:
blah[1]=stuff1;
blah[2]=stuff2;
code....
Programming :: Convert Short Array To Char Array?
Jun 7, 2010I have trouble converting a short array to a char array
Code:
short pShort[4] = { 0x41, 0x42, 0x43, 0x44 };
How to convert this to a char array?
Programming :: Get Eclipse C Compiler To Work - Warning: Implicit Declaration Of Function Strlen
Feb 11, 2009I have the plugin installed ok and have pasted in a C source file that I know works and am getting the following errors, I think because the linker options need to be set in some way. I cannot copy the errors but they all complain of implicit declaration of functions like this: -
warning: implicit declaration of function strlen
But I have the headers included, is this a linker problem? Here is the code -
#include <stdio.h>
#include <math.h>
int main(){
[code]...
Programming :: Converting A PHP Array Into An HTML Array?
Aug 9, 2009I'm writing a PHP program. I've encountered a problem; in the following code I try to pass $_POST['delete'] which is an array as the value of a hidden input to some form, but it doesn't do so.there's something wrong with converting PHP array into HTML array. I'm sure that $_POST['delete'] is not null and is a real array.
echo '<input type="hidden" name="delete[]" value="'.$_POST['delete'].'" />';
Programming :: Filling 2D Array With 1D Array In C?
May 26, 2010(I am using vector() and matrix() functions from "Numerical recipes in C".)There are 100 numbers to be stored in 2D array of 10 rows and 10 columns.100 numbers are stored in a 1D array.I get "segmentation fault" at the line indicated in the segment of my code below:
Code:
:
:
#define size 100
#define nl 1
[code]....
Programming :: Bash Array Add Function Example Using Indirect Array Reference As Function Argument?
Jun 20, 2010I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.
#!/bin/bash
addelementtoarray()
{
local arrayname=$1
[code]....
Programming :: Volatile Sig_atomic_t Int Terminazione=0 - Error "two Or More Data Types In Declaration Specifier"
Jul 16, 2010I need to have a global variable PHP Code: volatile sig_atomic_t int Terminazione=0; but I get the error error: two or more data types in declaration specifier even if I have included signal.h.
View 2 Replies View RelatedProgramming :: C++ Check If Pointer Is Deleted?
Apr 24, 2011Is it possible to check if a pointer is deleted in C++ (using GDB)? For example:
Code:
a = new Thing();
b = a;
delete a;
// If all I have is the variable "b", how can I tell if it was deleted?
Programming :: C - Malloc For A Void Pointer?
Mar 20, 2010So far I have this:
Code:
int mm_init (mm_t *MM, int hm, int sz) {
int i;
[code]...
Programming :: Comparison Between Pointer And Integer
Jul 6, 2010I'm trying to write a simple program that lists a menu and then asks you for your decision, and you can answer with a number or the name. However, I don't know how to add the second options (name).
View 14 Replies View RelatedProgramming :: Null Pointer In Bash?
May 19, 2011#!/bin/bash
sed -n 8p file.txt
returns the 8th line to the StdOut.
If I assign the value to the variable line = $(sed -n 8p file.txt)
and now print it out with echo
echo $line
the line would be printed.
But what if the file has only 4 lines. What value would be assigned to the variable line?
I want to know that because I want to only print it if the value is "something", that is not null.
In Java for example I would do it like this...
String line = "";
line = reader.readLine(); // or anything else..
if(line!=null){
System.out.println(line);
}
How would I check if the value is not "null"(I don't know if bash knows null)
Programming :: Arrays In The C Programming Language Are Pointers To The First Element Of The Array?
Mar 27, 2010I wonder why arrays in the C programming language are pointers to the first element of the array, not the first element of the array itself?
View 14 Replies View RelatedProgramming :: Access The Address Of A Character Pointer?
Jul 12, 2010i was trying to access the address of the character pointer it gives me the values stored in the variable.
Code: #include<iostream>
using namespace std;
int main()
{
char *i;
[Code]....
why is my code not giving the address of the variable i when it is a character pointer.
Programming :: Pointer As Function Return Doubt?
Jul 15, 2010I'm getting some information about C language and this session of a C book (follow the above link) is using a bad example for me. When I'm trying this example of function returning a pointer, my compiler is stating a warning that I return a pointer to a local variable. I realized that it is error prone after all this variable may be override before the function has done his execution. And the author is fooling me saying that this example is "perfectly safe". I'm wrong? There is something that I don't got yet? Sorry but this site is preventing me to post the link of book cause I'm a newbie, so a need the hack it. Just strip out the question signs:
{LINK}
?w?w?w
?cs.cf.ac.uk?
[code]....
Programming :: Assign Absolute Address To Pointer
Dec 20, 2010I want to assign an address location to a pointer and wanted to display the value at that memory location.I wrote a small program for this and it is like this : (i am using gcc 4.4 compiler)
# include "stdio.h"
int main()
{
unsigned int *a;
a=(unsigned int *)0x3f8;
printf("%u",*a);
return 0;
}
But it is giving Segmentation fault
Programming :: C - One Value In The Matrix Drops To Zero When Passed In As Pointer?
Dec 8, 2010This is one of the strangest problems I've run into while programming. Maybe there's just something wrong with my version of gcc or something.
The main problem comes at this point in the code:
Code:
po = makePoFromScorbotXYZPR(X, Y, Z, P, R);
h = makeHB2GFromPo(po);
printf("%le", *h[1][0]); //##################################### Here it has the right value
printf("%s", "
[Code].....
Programming :: Dereferencing Pointer Error During Compilation?
Sep 29, 2010I have got following code from a book:
Code:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>
#define PORTNUMBER 12345
[Code]...
Programming :: Disable Int-to-pointer-cast Warnings In G++?
Feb 28, 2010From "man gcc"
-Wno-int-to-pointer-cast (C and Objective-C only)
Suppress warnings from casts to pointer type of an integer of a different size.
[code]...
Programming :: Get A Void Pointer Cast To Work?
Sep 29, 2010I have been trying to get a void pointer cast to work and I seem to have some problems. My code compiles, but when I execute it gives back garbage data. I'm not sure what I'm doing wrong.
Code:
int main()
{
[code]....