The problem is below, but this is what I think is happening:

We are taking a copy of the pointer and allocating it in memory so that we can use it. We are doing that in the allocate_node function when it is called in main with allocate_node(p);

The problem is that when it comes over to main the pointer is unitialized right?

How do I initialize it?

Main should be an int, and I think allocate_node should not be a void. But I don't know how to fix this issue.

Thanks for any help.

//*********************************************

Consider the following program, written in C:

typedef struct

{

int x;

int y;

} Foo;

void allocate_node (Foo * f)

{

f = (Foo *) malloc ( sizeof(Foo) );

}

void main ()

{

Foo * p;

allocate_node (p);

p->x = 2;

p->y = 3;

free(p);

}

Although the program compiles, it produces a run-time error. Why?

Rewrite the two functions allocate_node and main so that the program runs correctly.