C :: Passing Arg 1 Of Strcmp Makes Pointer From Integer Without Cast

Jan 18, 2015

Code:

#include <stdio.h>
int main(){
int a=15 ;
int b =20 ;
strcmp((a, "20") == 0) {
printf("Correct!");

[Code] .....

passing arg 1 of `strcmp' makes pointer from integer without a cast

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C :: Passing Argument 1 Makes Pointer From Integer Without A Cast

Mar 6, 2015

Code:
#include<stdio.h>
print_int_ptr(int *a){

printf(" a %i
" ,a);
printf(" &a %i
" ,&a);

[Code] .....

I get that warning : passing arg 1 of `print_int_ptr' makes pointer from integer without a cast|

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C :: Passing Argument 1 Makes Integer From Pointer Without A Cast

Mar 26, 2014

I am having some errors with pointers and passing arguments.

Code:

#include <stdlib.h>
#include <stdio.h>
#define MAX_FILE_LENGTH 20
typedef struct node_{
int value;
struct node_* next;

[Code]....

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C :: Makes Integer From Pointer Without Cast

Mar 18, 2013

The warning: :63:7: warning: passing argument 1 of fputc makes integer from pointer without a cast [enabled by default]

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>

[Code]....

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C :: Warning - Return Makes Pointer From Integer Without A Cast

Sep 21, 2013

I have a function that I want to exit gracefully when an "error" occurs in an input file. My function declaration is:

Code: BSTnode *buildTree(FILE *fp)

The few lines that are causing the problems are:

Code: if(regcomp(®ex, to_find, REG_EXTENDED | REG_NEWLINE) != 0) {
fprintf(stderr, "Failed to compile regex '%s'
", to_find);
return EXIT_FAILURE;
}

I know that if I just use "return" by itself the warning goes away but fails to exit when the error occurs. I also believe this may not be the correct use of stderr. But I need the program to exit when an error has occurred.

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C++ ::  In Function Assignment Makes Pointer From Integer Without A Cast

Jul 4, 2013

The log file gives me: In function ‘memFileAlloc’ assignment makes pointer from integer without a cast..When compiling the drivers for the Matrox card in the DL580. The offending code is:

STACK_LINKAGE MEMHANDLE memFileAlloc(
UINT32 dwSize,
const char* pszFileName,
int iLine) {
void* pvChunk;
#if MEMORY_STATS

[code]...

I think the offending line is:
pvChunk = ClientMemAlloc(dwSize + sizeof(UINT32), NULL)
because that's what the log file tells me.

The system is a 16 core HP DL580 G4 with 8g RAM, RAID 0, Mandrivalinux 11.0 and the display is a Matrox Parhelia 256PCIx.

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C++ :: Why Assignment Makes Pointer From Integer

Jul 27, 2013

when i compile the following program i get a compiler warning, but i don't understand why. for me the code seems to be all right and does legitimate this warning. so here is the code

// multiplication.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "crypto.h"
#define PROGNAME "multiplication"
void usage();
int isnumaber(char* str);

[code]....

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C :: Making Integer From Pointer Without A Cast

Dec 15, 2013

Code:
#include <stdio.h>
#include <stdlib.h>
#define CLASS 4
#define STUDENT 11
#define GRADE 5

[Code] ....

Giving me that error on 75:10
avesub+=grade[k];
and 90:17
donkeypunch+=grade[j][k];

not sure exactly why

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C/C++ :: Warning - Cast From Pointer To Integer Of Different Size

Jan 23, 2014

int hash = 0;
char *strings[100];
if((int)strings[i] != 0)
if((int) strings[hash] != 0)
while((int) strings[hash] != 0)
if((int)strings[hash] != 0)
if((int)strings[hash] != 0)

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C :: Cast Of The Pointer To Array

Dec 7, 2013

In my refference book I have got a example with a part saying to access the a[4][0] element of the array (named a) with pointer this can be written:

*((int*)a+4)

I wonder if the cast is really required. The book says it is required so that the pointer arithmetic can be done properly. However I am not sure about it. When I work with pointers defined by myself I don't use casts similar to this one. Is there a difference between a self defined pointer and array name?

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C :: Cast To Character Pointer For Printf

Apr 18, 2014

I cannot get the following to compile. The problem is the printf on the last line. I understand that printf requires a char (or pointer to char). I understand that I can convert between datatypes by putting the target data type in parenthises in front of the variable. But how do I cast the integer into a character and then get it's pointer to pass into printf?

Following is my code. I compile with gcc temp.c -o temp.

Note that I have tried many attempts at that last line and this is just the one that I really, really think should work (or is at least the closest to the correct answer).

This code shown below, using printf("%s", &(char)nextChar); returns

temp.c:26: error: lvalue required as unary '&' operand

If I try to use printf("%s", *(char)nextChar); I get the error

temp.c:26: error: invalid type argument of 'unary *' (have 'int')

This line printf("%s", (char)nextChar); returns the obvious

format '%s' expects type 'char *', but argument 2 has type 'int'

Code:

#include <stdio.h>
int main() {
printf("hello, world
");
#if defined(SUNDIALS_EXTENDED_PRECISION)

[Code] ....

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C++ :: Cannot Cast From Void Pointer - Returns Always Error C2440

Apr 25, 2013

I having a problem which I'm not able to resovle. I try to dereference a void pointer but I always get a C2440 error. It says: 'static_cast':void* cannot be converted in wqueue<T>. I tried different cast ways but I always get the same error. As far as I found out I should get the error if I try to dereference without cast but in my case I cast before and still get that error.

void *srumbler (void *arg) {
wqueue<workclas*> m_queue= static_cast<wqueue<workclass*>>(arg);
return NULL;
}

The according type wqueue in the header file:

template <typename T> class wqueue {
list<T> m_queue;
pthread_mutex_t m_mutex;
pthread_cond_t m_condv;

[Code] .....

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C++ :: Cast Base Class Pointer To Derived Class Pointer

Feb 6, 2015

I create an instance of a base class (not derived class) and assign it to base class pointer. Then, I convert it to a pointer to a derived class and call methods on it.

why does it work, if there is a virtual table?

when will it fail?

// TestCastWin.cpp : Defines the entry point for the console application.//

#include "stdafx.h"
#include <iostream>
class B
{
public:
B(double x, double y) : x_(x), y_(y) {}
double x() const { return x_; }

[Code] ....

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C :: Why Integer With Array Change After Passing Through The Function

Apr 12, 2014

Code:

#include <stdio.h>
void define (int integer, int IntArr[0], int *IntP);
int main(void)
{int integer = 0, IntArr[1] = {0}, IntP = 0;
define(integer, IntArr, &IntP);

[Code]...

Why does the integer with array change after passing trough the function and the normal integer doesn't? (I know why the normal one doesn't, but I dont get the array one)

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C++ :: Passing Values From Text File To Integer Array

May 24, 2013

I'm trying to passing values from a text file to an array. The values in txt file is;

0 2 3 5
1 2 5
0 1 3 6
1 3 5

I need to store these values in an array like that

Code:
int array[?][?]={{0,2,3,5},{1,2,5},{0,1,3,6},{1,3,5}};

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C++ :: Passing / Returning Character And Integer Arrays With Functions

Jun 21, 2013

Passing and returning character and integer arrays with functions using simple programs...use pointers if necessary

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C/C++ :: Passing A Global Pointer?

Feb 29, 2012

Let's say I've got something like this:

struct Box{
//something
};
typedef struct Box* pBox;

[Code]....

function fun recieves the address(which is NULL) and then allocates the memory for the Box; Let's say I cannot return the address of new allocated p and I can't also use that pointer p(from main) without passing it into a function.

Q: How can I make it that I could operate in function "fun" as I operate on orginal pointer p(from main), right now I'm just passing the address to my function but I can't change the 'global' pointer p ;(.

I remember in pascal it's like:
"function(var pointer:[pointer to sth])"
and all is done.

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C :: Passing A Pointer To Array Of Structs

Nov 20, 2013

what I am trying to do is to pass to a function the address of an array of structs, so I can later modify the items within the struct, within the array

Code:
typedef struct { //A struct of name auctionint bidder;float bid;} auction;
void myFunction (auction * auctionItem[]){(*aucItem[x]).bid = y;(*aucItem[x]).bidder = z;}
int main(){auction theItems[10];
myFunction(theItems);} Where x, y, and z can be any number.

When I try to run my code the IDE (I'm using Code::Blocks 12.11) does not give me any errors, but it does give me a warning:

warning: passing argument 3 of '<function name>' from incompatible pointer type [enabled by default]

and the note:

note: expected 'struct <struct name> **' but argument is of type 'struct <struct name> *'.Also, when I run the program, it will crash and return garbage.

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C :: Passing Structure Pointer To A Function

Aug 24, 2014

I am trying to wright a program that takes student grade data from a command line file, calculates a final grade, and copies the final grades to an output file. So far I have two functions, one that creates a student structure by allocating memory for it and returning its address, and one that should take that address and fill it with data from a line from the input file. My ultimate goal is to use a linked list to connect all the structs, but for now I just want to get the functions working. When I run what I have so far, I get an error C2440 (using visual 2010) that says "cannot convert from 'cStudent *', to 'cStudent', and points to the line where I call my fill function. How should structure pointers be passed?

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct student // Declaring student structure globally.

[Code] .....

Also, here is a sample of what a line from the input file would look like:
Bill Gates, 60, 54, 38, 62, 65, 60, 50

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C :: Passing Array Of Pointer To A Function

Sep 7, 2013

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_CMD_LINE 500
void tokenize(char *cmd_ln, char *fun_tknzd[], int *argument_cnt);

[Code] ....

I am trying to pass the value of fun_tknzd to str_tknzd

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C++ :: Passing Pointer Into Template Function

Oct 14, 2014

I'm trying to pass the pointer of a dynamic array into a template function, but it keeps telling me there is no matching function to call because the parameters I'm passing in are wrong. how to make the function accept the pointer.

//main
int main()
{
srand(unsigned(time(NULL)));
int size;
int *list;
int *listCopy;

[code].....

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C++ :: Passing Array As Pointer To A Function?

Apr 24, 2014

I can clearly understand how to pass a dynamic array to a function and modified within the function..

My aim is to get back the array initialized as I am trying on the next sample of code..

Code:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <iostream>
#include <fstream>
using namespace std;
#define N3//number of bodies
void initialise( double *M[], double *X[], double *y[])

[code]....

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C++ :: Passing Object By Pointer To Function?

May 20, 2014

I have a Qt classes as follow:

Code:

class Vehicle {
public:
void AddData(QString str, Data* data) {
_myDataMap.insert(str,data);
} virtual void Init();

[code].....

My questions are:

After the main function called d1->Modify; the data stored in _myDataMap will get modified too.

What is the more appropriate way of passing the Data through AddData in such case?

If i do AddData(const Data & data), i will not be able to use inheritance of Data, i.e passing a subclass of Data to AddData.

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C++ :: Labels As Pointer - Passing Address To A Function

Mar 7, 2014

Is there such thing as passing a winforms label by reference? For example, can I create a pointer label and pass the address to a function? I've looked online but couldn't find anything. Perhaps that's a sign?

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C++ :: Passing Pointer To A Function - Calling Routine

Dec 4, 2013

I have this code:

#include "stdafx.h"
#include <iostream>
using namespace std;
void square_cube(float *x,float *y) {

[Code] .....

The function should pass the square of the first input parameter and the cube of the second input parameter back to the calling routine. I thought I could use a recursion but its not going to work.

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Visual C++ :: Passing Class Pointer Via Socket

Oct 14, 2013

I have a function called,

App 1:
void GetImage(CImage * img) {
//Pass &img over socket to another app
}

App 2:
void DisplayImage() {
CImage * pImg = &img;
}

Is it possible to pass a class pointer as memory buffer across the socket? The above code is just an example. My question in general is, whether it's possible to pass any Classes pointer as a memory buffer across sockets.

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