Structures with Pointers question

[KanuAMBC]

Hi, Does anyone know how i can store the address of a particular node ie. "startPointer ". This variable will store the address of a node so that that i can call out to the node when i need it in any of my functions. My code will have no problem if I declare the startPointer variable globally. But the problem now is that based on my assignment req, I'm not allowed to declare any variables global other than the specified ones.

struct data
{
double xstart, xend, ystart, yend; //get xstart,xend,ystart,yend values
int child, iter, width, height; //get iteration value
data* next; //pointer to next node
};data* startPointer ;
...
...
main(){...

Is there any way that I could get around this to declare it inside main()? My coded doesn't work if i use it in main()

Thanks.

[Banfa]

But the problem now is that based on my assignment req, I'm not allowed to declare any variables global other than the specified ones.

What are the specified ones?

Declare your start pointer in main, pass a pointer to it to all sub-functions.

struct data
{
double xstart, xend, ystart, yend; //get xstart,xend,ystart,yend values
int child, iter, width, height; //get iteration value
data* next; //pointer to next node
};
 
static SomeFunction( data **pStartPointer, int SomeOtherParameter);
 
main()
{
    data *startPointer;
 
    startPointer = malloc(sizeof *startPointer);
 
    SomeFunction( &startPointer, 7);
}
 
static SomeFunction( data **pStartPointer, int SomeOtherParameter)
{
   (*pStartPointer)->width = SomeOtherParameter;
}