Please help with pointers!!!

[Elina]

I have this code and I get this error messages, when I try to initialize mypointer:
E2238 Multiple declaration for 'identifier'
E2344 Earlier declaration of 'identifier'
E2141 Declaration syntax error

//---------------------------------------------------------
#include <vcl.h>
#include <stdlib.h>
#include <math.h>
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;

struct sar
{
int x;
int y;
int mgn;//magnitude
sar *nextpx;
sar *nextline;
};

sar *mypointer=new sar;

//compiler shows this is a wrong line
mypointer->mgn=9;


//---------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
struct sar
{
int x;
int y;
int mgn;//magnitude
sar *nextpx;
sar *nextline;
};

sar *n1=new sar;
n1->mgn=9;
}
//---------------------------------------------------------void __fastcall TForm1::FormKeyPress(TObject *Sender, char &Key)
{
exit(0);
}
//---------------------------------------------------------

 

[xwb]

This code needs to sit in a routine

  sar *mypointer=new sar;
  
  //compiler shows this is a wrong line
  mypointer->mgn=9;

 

[LeonidVorozhun]

Hello Elina.

First of all, I think that sar should be declared only once. I guess it could be global declaration as it is in your code.

And i'm not sure, but i think that operator new is used to allocate memory for classes, not for the other types.
In that case use memory allocation functions, for example:

sar *mypointer=(sar*) malloc(sizeof(sar));