C :: Function That Will Work For Both Dynamic And Static Implementations Of A Function To Get Transverse Of Matrix

Feb 11, 2013

i need a function that will work for both dynamic and static implementations of a function to get the transverse of a matrix. so far, i have this

Code:

matrix transpose(matrix m)
{
int row, col;
row = m.com_dim;
col= m.row_dim;
}

[code]....

this works well with my static implementation, but when i try it in dynamic it gives me errors. the function has to be the same for both dynamic and static implementation

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C++ :: Template Function Don't Work As Inline Function?

Mar 8, 2014

I have this:

string input;
unsigned short choice;
...
istringstream valid(input);
...
if(!(valid >> choice))
{
//some error
}

Ok. My code is almost 1000 lines, and I have splited some functions in headers. But the same function doesn't work:

template <typename T> bool valid_input(const string& input, T var)
{
istringstream valid(input);
return (valid >> var);
}

You can check it here: [URL] The output is correct, but in my machine with C++11, MinGW 4.8 (64 bit in a 64bit-Windows8), the output is incorrect. Why?

If you want more specific info, the problem is that I use input, I think. I use std::getline(std::cin, some_string).

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C :: Dynamic Array From Function To Function

Oct 19, 2014

my program is just counting the maximum of the array, however, I'd like to do that with the dynamic array (with pointers).

Code:

#include <stdio.h>
#include <stdlib.h>
void ArrayScan(int n, int *h);
void ArrayMaximum(int n, int *h, int x);
int main()
}

[code]....

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C++ :: Print Function Does Not Work Properly

May 21, 2013

This is my code for submitting students but when i use search function the course member is empty

Code: #include "windows.h"
#include "iostream"
#include <io.h>
#include <sstream>
#include <conio.h>
#include <stdlib.h>
#include <iostream>
#define SIZE 5
using std::cout;
using std::cin;
using namespace std;
int menu();

[code].....

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C :: Qsort Function Won't Work Properly

Mar 20, 2013

i am facing some problem with qsort() function it work well if the last element of array is larger then the 2nd last element. But in case if last element of array is smaller then the 2nd last it will sort the whole array and remains the last as it is. For example

Code:
int group_id_local[max_j]={2,1,4,5};// it work fine, output should be {1,2,4,5} but if i have this one

int group_id_local[max_j]={2,1,4,3};
// output should be {1,2,4,3}
/* COMPARE FUNCTION FOR USING QSORT()*/
int cmpfunc (const void* a, const void* b)
{
if (*(int *)a < *(int *)b) return -1;
if (*(int *)a > *(int *)b) return 1;
return 0;

[Code]....

why it will not sort the last element?

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C++ :: Can A Friend Function Work For Two Classes?

Mar 23, 2013

If yes then how?

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C++ :: BST Node And Count Function Don't Work?

Dec 2, 2013

I have to do a BST project for school and I am almost there. Here is the code:

BINARY_SEARCH_TREE.cpp
#include "stdafx.h"
#include "genBST.h"
#include <iostream>
using namespace std;

[Code].....

When I run the program, it compiles correctly but does not give any output. I'm not sure what else to do. I've tried changing up the code in nodeCount(), leafCount(), NodeCount(), and LeafCount(). I've tried adding a count variable to both nodeCount() and leafCount() but that didn't work. If I fiddle with the functions, I get a whole mess of errors. Currently, the code is stable but just won't output what I want it to.

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C# :: Can't Get Math (Sine) Function To Work

May 21, 2014

I'm having trouble with getting a sine function to work. All variables are defined earlier in the same section. I have the code in a button (where I figured it would go) but I get the following error:

WindowsFormsApplication2.Math does not contain a definition for 'Sin'

For reference, I am using Microsoft Visual Studio Express 2013, and am coding a Windows Forms Application.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;

[Code] ....

I've tried other functions as well (abs, sqrt, etc.) to no avail, as Math only seems to pop up with two options: Equals and ReferenceEquals.

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C++ :: Make A Function Integrate To Work With Other Functions Given

Mar 10, 2013

We have to make a function integrate to work with the other functions given. I had it working before but I would only get all -4 as my answers but only the first one should be -4. what should more or less be put in my integrate function?

#include <iostream>
using namespace std;
typedef double (*FUNC)(double, double, double) = (line, square, cube);
double integrate(double FUNC, double a, double b){
for(int i=0; i<a && i<b; i++){
FUNC = a-b;

[code]......

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C++ :: Quicksort Function To Work With Class Array

Jan 19, 2013

void Quicksort(int info[],int left,int right){
int pivot = left + (right - left)/2;//it is the middle (will change sometimes but will end up in the middle
int temp;

while(left<=right){
while(info[left] < pivot){

[Code] ....

This is my quicksort function. I have tried a lot of things but I am trying to get it to work to sort all the details I have stored in an array by there age. This is how I have entered the data.

void DataEntry(Details info[],int size){
int x;
int i;
i=0;
cout << "How Many Entries Would You Like to add";

[Code] ....

I am stuck on what to do with it

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C++ :: Program Matrix Multiplication But It Work Not For Big Arrays?

Mar 9, 2014

I have a program matrix multiplication but it work not for big arrays. n should be bis 200.

#include <iostream>
#include <time.h>
#include <cstdlib>

[Code]....

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C :: Delete Each Element In The List Which Is Same - Function Does Not Work Properly

Jan 18, 2014

Code:

struct lista* del(struct lista* p, char* path1) {
char model[MAX2];
int len;
char ch;
printf("Type model.

[Code] ..... t

This function should delete each element in the list which is the same as this one typed by user. There are no errors, but function doesn't work. It deletes something, but not this element which should.

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C++ :: Convert QT String Manipulation Function To Work With Strings?

Feb 15, 2012

I have the following function I would like to convert to work with std:string. I don't understand QT strings at all.

Code:
void FromHexString(const QString &hexText, void* pData, int dataSize) {
for (int i = 0; i < hexText.length(); ++i) {
bool ok = false;
((uint8_t*)pData)[ i ] = hexText.mid( 2*i, 2 ).toInt( &ok, 16 );
}
}

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C++ :: Matrix Class - Template Constructor Doesn't Work So Well

Feb 5, 2013

I realized a Matrix class to practice and I have a problem I can not solve! Here my problematic code:

Mtrx.h:

Code:
template <class T>
Mtrx::Mtrx(dim m, dim n, const bool random_constructed = false, const T min = static_cast<T>(0), const T max = static_cast<T> (10))
Mtrx.C

[Code] ...

And here the relative main section:

Code:
Mtrx rand1 ( 5, 5, bool);// ok
cout<<rand1<<endl;

Mtrx rand2 ( 7, 3, bool, -5, 20);// ok
cout<<rand2<<endl;

Mtrx rand3 ( 7, 7, bool, 0., 15.);// compilation error: undefined reference to
// "Mtrx::Mtrx<double>(unsigned long, unsigned, bool, double, double)"
// collect2: error: ld returned 1 exit status

I compiled in a Linux OS with g++ -std=c++11

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C++ :: Why Cannot Dynamic Memory Allocation Work With References

May 5, 2013

Why cant a dynamic memory allocation work with references? I was told that references work with const pointers deep down so shouldn't this be legal code?

int &&a=new int;

My compiler says that a entity of int* cannot be used to initialize a entity of int&&?

Does that mean that the compiler thinks of them as different types except deep down a reference is implemented with a pointer? Is this right?

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C++ :: Function To Count Digits Of Entered Number Doesn't Work

Feb 19, 2013

I wrote a program with function my own function which count the digits of entered number. The problem is whatever i type it shows 0 digits.Why is that?

Code:
#include <iostream>
using namespace std;
int cikCipari (int skaitlis, int cipars);
int main()

[Code] .....

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C++ :: Adding Void Function In Visual Studio 2012 Does Not Work

Mar 1, 2013

I am trying to add a void function in Visual Studio 2012 but it doesn't work, meanwhile in Codeblocks it does:

#include <iostream>
using namespace std;
int welcome();
int main(){
welcome();

[Code] ....

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C :: Static Array Of Function Pointers

Jan 29, 2015

I basically have some code that lets users register callbacks into a callback table at a specified index. There is one element in this table for each event that can trigger a callback. I basically do something like this:

In a header file

Code:
typedef struct _GMclient
{
GMcommunicator gcomm;
GMclient_callback callback_table[(int)MAX_CALLBACKS];
}GMclient;

typedef int (*GMclient_callback)(GMclient*, void*, void*);

Then I allow them to set the callback with a function that basically ends up doing this (in a .c file that includes the previous mentioned .h file):

Code:
void
GMclient_register_callback(GMclient *client,
GMclient_callback fxn,
int index)

[Code] ....

Then later when I need to invoke that callback, I pull it out of the table

Code: GMclient_callback *fxn = client->callback_table[CMD_INDEX];

However, I get compilation errors:

Code: src/gmanager_client.c:43:6:

error: a label can only be part of a statement and a declaration is not a statement...

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C++ :: Static Variable In Member Function

Aug 27, 2014

I need to keep a static variable in a member function of a class that I have many objects of. I've had some trouble with it, and when I read up I found that such variables are static across all instances. Is there any way around this?

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C++ :: Getting Static Member / Function Errors

Mar 8, 2014

What am I doing wrong with static members and methods here?

compiler errors:

1>test.obj : error LNK2005: "private: static int Test::count" (?count@Test@@0HA) already defined in main.obj
1>c:usersjamesdocumentsvisual studio 2013Projectsstatic_testReleasestatic_test.exe : fatal error LNK1169: one or more multiply defined symbols found
test.h
#ifndef TEST_H_
#define TEST_H_
class Test {

[code]....

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C Sharp :: Write Log Using Static Function?

Oct 30, 2012

In my code, I wanted to write log exception to some file.

So I created a Utility class & wrote a static method in that to write log message to file.

public static void WriteLog(string message) {
  using (FileStream fs = new FileStream(@"c:log.txt",  FileMode.Append)) {
     using (StreamWriter streamWriter = new StreamWriter(fs)) {
          streamWriter.WriteLine(message);
     }
  }
}  

This works fine so far but I fear if two methods call this function simultaneously.. what will happen? Also, I want to access this same Utility library in my other "WEB" projects... will it work there too?Or else.. what will be the best way to log exceptions in any project?

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C++ :: Static Variable And Function With Template

Jul 18, 2012

I try to create small project in order to better understand how key word static works with templates . However some compiles errors crush my plan.

1>------ Build started: Project: 4.2b - Ex 1. Static Variable for Array Def Size. Templates, Configuration: Release Win32 ------
1> main.cpp
1>c:all myс++ha level 6solution level 6solution level 64.2b - ex1. static variable for array def size. templatesarray.cpp(40): error C2724: 'Array<Type>:efaultSize' : 'static' should not be used on member functions defined at file scope

[Code] .....

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C++ :: Error - Reference To Non Static Function Must Be Called?

Feb 27, 2013

So on lines 36 - 39 (The commented out functions) is where I'm sure is causing this error because once I don't comment them out pretty much everywhere Flink or Rlink is used or defined I get this error.

#ifndef nodes_Nodes_h
#define nodes_Nodes_h
#include <cstdlib>

[Code]....

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C++ :: Function Pointer To Non-static Class Member

Aug 19, 2014

I have the following problem: I am using NLOpt for optimization. The API provides functions to set the objective. This is done as follows:

double objective(const vector<double> &x, vector<double> &grad, void *data)
{
return x[1]*x[0];
}
int main(){
nlopt::opt opti(nlopt::LD_MMA,2);
opti.set_min_objective(objective,NULL);
vector<double> x(2);

[Code]....

Now I want to make the function objective a member of a class:

class Foo {
public:
double objective(...){..}
};

How can I give this method to opti.optimize? If I make objective static I can use

opti.optimize(Foo::objective,NULL);

but I do not want to have a static member. Is it possible to create an object of type Foo and give it to opti.optimize?

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C++ :: Static Variable Inside A Member Function

Jul 20, 2013

Say you had:

class Foo{
public:
//...
void funky();

[Code] .....

Would each instance of Foo create a new counter variable, or would it remain the same for all of them, i.e. baz.funky() would always use the same counter variable? What if the class was a template?

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C++ :: Error Using (this) Pointer In Static Members Function?

Sep 4, 2012

I am trying to use 'this' pointer but i am confused why 'this' pointer is not available for static member functions.

Code:
#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
const int MAX = 20;
const int MAXPTR = 100;
class name {
private :
char fname[MAX], mname[MAX], lname[MAX];

[code].....

I am using GNU GCC Compiler via Code::Block

Error : 'this' is unavailable for static member functions

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