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 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 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 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 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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C :: File Opened In Main And Passing Pointer To A Function

Sep 14, 2013

I am getting a few compile errors for what might be a simple thing to do. I am opening a file in main, passing that pointer to a function and checking the contents of that file with a regex before I pass it on to build a BST. I am getting the following compile errors, what is wrong. Here are the errors:

Code:
gcc main.c fileCheck.c -o tree
main.c: In function `fileCheck':
main.c:19: error: syntax error before "FILE"
fileCheck.c: In function `fileCheck':

[Code] .....

Fatal error: Command failed for target `tree' Here is the two files and header that seem to be causing me the problems.

main.c

Code:
#include "main.h"
//#include "node.h"
int main(int argc, char *argv[])
FILE *fp;
if (argc > 2)

[Code] ....

And the header file.
main.h

Code:
#ifndef MAIN_H
#define MAIN_H
#ifdef __cplusplus
extern "C" {
#endif

[Code] .....

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C++ :: Passing A Function Pointer As Template Argument To A Class

Aug 15, 2012

I have in the past written code for templated functions where one function argument can be either a function pointer or a Functor. Works pretty straightforward.

Now I am in a situation where I am actually trying to pass a function pointer as template argument to a class. Unfortunately this does not work, I can pass the Functor class but not the function pointer. Below code illustrates the issue:

Code:
#include <string>
#include <iostream>
#include <sstream>
#include <cstdlib>
// For demonstration
const char * external_library_call() {
return "FFFF";

[Code] .....

The idea is to have the definition of the Record class simple and readable and have a maintainable way to add auto-conversion functions to the class. So the lines I commented out are the desirable way how I want my code to look. Unfortunately I could not come up with any way that was close to readable for solving this.

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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 A File Pointer To A Function Is Producing Undesired Output

Oct 27, 2013

I am working on a project and decided to try something simple before I start adding items. I am calling a function from main and that function has a file pointer.

Here is my main.cpp

Code: #include <cstdio>
#include <string>
#include <iostream>
#include "main.h"
extern FILE *fp;
using namespace std;
int main(int argc, char *argv[])

[code]....

Here is the function:

Code:
#include <string>
#include <cstdio>
#include <iostream>
#include "main.h"

[Code] ....

My test file consists of several characters and digits. Nothing special and I at this point in time do not have any type of formatting that needs to be adhered to. I am simply wanting to read the file character by character and print it out. When I run the program, I get this symbol:

Code: If I use a printf statement, such as:
Code: printf("%s
", nextChar);

I get a segmentation fault.

My main.h Code:

#ifndef MAIN_H
#define MAIN_H
void scanner(FILE *);
//char getChar(FILE *);
#endif and lastly my scanner.h Code: #ifndef SCANNER_H
#define SCANNER_H
FILE *fp;
#endif

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C++ :: Template Function Parameter Passing By Reference Instead Of Copy / Pointer

Sep 19, 2014

Basically I'm trying to pass an object as a reference to the template function, rather than a copy as it's seeing. I'm needing to do this without editing Obj::Call to accommodate a reference as its first parameter, as it'd break other calls.

You'll notice in the following code the object will be destroyed upon passing, while the object defined is still in-scope due to the infinite end loop.

#include <iostream>
#include <string>
using namespace std;
class Obj {
public:
string name;
Obj(string name): name(name) {cout << "create " << this << endl;}

[code]....

In the past I tried ref(), which appeared to stop this happening, however it created a blank copy of the object instead.

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C :: How To Stop Passing Char Array Index As Pointer

Dec 23, 2013

I am trying to write a light weight printf style function.

I have got this far:

Code:

void println(const char *txData){
LOG(__PRETTY_FUNCTION__);
UARTPuts (LPC_UART0, txData);
}
void miniPrint(const char *format, ...)
{
unsigned int index = 0;
va_list argptr;
va_start(argptr, format);

[Code]....

I understand why I think. When I am passing the reference to the array possion it is outputting everything up to the next /0. So my question is how do I stop it?

I dont have much choice as to how the output wants it:

Code: void UARTPuts(LPC_UART_TypeDef *UARTx, const void *str)

Thats library code, so I dont want to change it. I.e I have to pass an address into println.

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C :: Passing Argument Of Incompatible Pointer Type - Warning In Function Call In Main

Jun 4, 2013

Code:
#include <stdio.h>
#include <stdlib.h>
int size_b_row1;
int size_b_col1;

[Code].....

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C++ :: Passing Arguments From Incompatible Pointer Type - Warning In Function Call Transpose In Main Routine

Jun 4, 2013

#include <stdio.h>
#include <stdlib.h>
int size_b_row1;
int size_b_col1;
int main(void) {
double C[4][4] = {{1,3,5,2},{7,6,2,2},{1,2,7,3},{2,3,5,3}};
double TC[4][4];
transpose(C, TC);

[Code] ......

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C++ :: Passing 2 Dimensional Array Through Median Function To One Of 2 Other Function

Aug 20, 2013

I want to use one median function "selectfunction" to choose one of the 2 other functions at random to pass my 2-dim array to the selected function. There is a problem in the median function

#include <iostream>
#define random(x)(rand()%x) // for random number between numbers of 0 and 1
using namespace std;
void proc1 (int iArray[][2]);
void proc2 (int iArray[][2]);
void selectfunction(int iArray[][2]);
int A[4][2] = {{1, 2} , {3, 4} , { 5, 7} , {8, 1} };

[Code]...

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C :: Print Values Of Array From Function By Passing Array?

Nov 1, 2014

I wanted to print the values of a array from a function by passing the array as well as the number of elements to be read. For a single dimensional array, this is how i have written it. It's pretty straight forward. I want to read 5 elements from the 5th element in the array.

Code:
#include<stdio.h>
void display(int array[],int size) {
int i;

[Code]....

With this code I want to print the five elements from the element present in [0][4].

But shows an error that

Code:
D:BennetCodeblocks CLearning CSingleDimentionalArray.c||In function 'main':|
D:BennetCodeblocks CLearning CSingleDimentionalArray.c|18|warning: passing argument 1 of 'display' from incompatible pointer type [enabled by default]|
D:BennetCodeblocks CLearning CSingleDimentionalArray.c|2|note: expected 'int (*)[10]' but argument is of type 'int *'|
||=== Build finished: 0 error(s), 1 warning(s) (0 minute(s), 0 second(s)) ===|

I know when you pass a array as an argument it gets decomposed into a pointer, but with a multi-dimensional array this is not the case. how this works for mult- dimensional array's?

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C++ :: Passing 2D Array To A Function Where Size Of Array Is Not Known At Runtime

Jun 27, 2014

I'm wondering if it is possible to pass a 2d array to a function where the size of the array is not known at runtime.

I've tried

function ( array[][6] ) ;

But the size of the array has to be constant so it cannot be declared later.

I've tried using a template but you still have to declare the size of the array at runtime. Is this even possible at all?

The only other way I can think of is using a dynamic 2d array but how to create one and manipulate it.

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C :: Passing Array To Function?

Jul 31, 2014

I want to pass array to function, to fill array with new values and then to print the array in the main. But I have problem because it prints me just array of zeros. Maybe the concept is wrong, I'm new with passing arrays to function.

function:

Code:
void printSum(int *return_array) {
int return_array[3];
int i;
for(i = 0; i < 3 ; i++){
return_array[i] = 5;

Code:

void printSum(int *return_array);
int main {
int m_return_array[3];
int i,j;
for(i= 0 ; i < 3 ; i++){
m_return_array[i] = 0;
} printfSum(start,m_return_array);

[Code]...

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C :: Passing 2D Array To A Function

Sep 17, 2013

I need to pass a 2D array to a function. I want to know, where I may have made a mistake. This is the piece of code that I found on the web, and I am using it to allocate my 2D array.

Code:
signed char allocate2D( int** arr2D, int rows, int cols )
{
int i;
arr2D = malloc( rows*sizeof( int* ) );
if( !arr2D )
return -1;

[Code]....

My main function passes the 2D array to the function

Code: signed char read_root_message_file( int **Root_Messages, int *num ) This is how I pass the array in the main function to the above function:

Code:
int main( int argc, char *argv[] )
{
int **Root_Messages;
...
...
Root_Messages = NULL;
read_root_message_file( Root_Messages, &num_root_msg );

[Code]....

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C :: Passing Array To A Function?

Apr 6, 2013

Would this be an example of passing an array to a function??

Code:

void wipe (int theArray[] ) {
int index;

printf("
Inside function wipe() sets each array element back to 0.
");

[code]....

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C :: Passing Array To Function

Jan 19, 2014

I am following a tutorial and the topic was passing array to function so i tried to do a BMI calculator by myself. I am using code blocks to compile the codes, it is actually working while using compiler's run button. But when I open the exe file, its closing the window after entering the persons' weights and heights. Here is the code

Code:

// Passing array to function example BMI calculator of n person
#include<stdio.h>
#include<math.h>
void assess(float bmi[],int a);
int main(void){
int n,i,j;
}

[code]....

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C++ :: Passing Array To Function

Jan 8, 2014

I am learning arrays i want to whats the following effect of cods while passing array to the following function

void fun(array[])
void fun(array[4])
void fun(array[],4)
void fun(array[5],4)

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C++ :: Passing Array In A Function?

Apr 18, 2014

i have defined an object which is an array of my class called Player now i want to pass this whole array as a parameter in a function, i think it will be done by using pointers but i am not able to figure out how it is done?

Player player[4];
void showscoreboard(" ", int cround){}
" " represents the blank where the array should b passed.

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C++ :: Passing 2D Array To Function

Feb 10, 2013

I was trying to pass the following 2-dimensional array to a function called jac_inv

jac_inv(jac,3);

where jac is a 3x3 matrix
function is as follows:

void jac_inv(int *jac, int m) {
double determinant=0.0;
for(i=0;i<m;i++) {
for(j=0;j<m;j++) {
j_inv[i][j]=jac[i][j];

[Code] ....

However,I get the following error

invalid types 'int[int]' for array subscripts

Is it with regard to passing a multi dimensional array to a function?

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C++ :: Passing Array To Function?

Jan 8, 2014

i am learning arrays i want to whats the following effect of cods while passing array to the following function

void fun(array[])
void fun(array[4])
void fun(array[],4)
void fun(array[5],4)

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