Stack that contains Pointers to other Structs - c

Question

I tried making a Stack that contains Pointers(meaning adresses) that point to some other kind of structs(Prof or Stud). But I can't seem to manage it. The errors were infinite. Here's the code:
struct MyStack
{
int head;
void **stack;
int size;
};
struct stud
{
char flag;
char fname[50];
int semester;
};
struct prof
{
char flag;
char fname[50];
char course[30];
};
int InitStack(int size,struct MyStack *stack);
int InitStack(int size,struct MyStack *stack)
{
stack->size = size;
*stack->stack=(int *) malloc(size*sizeof(int) ); //Is this RIGHT?
stack->head=-1;
return 0;
}
int main()
{
int size,sel;
size = GiveSize();
struct MyStack NewStack;
InitStack(size,&NewStack);
do{
sel=Menu();
Select(sel,NewStack.head,&NewStack);
}while (sel!=0);
return 0;
}
How I can push pointers(that point to studs and profs) to the stack?
Heres the code:
int CreateStud(struct MyStack *stack,char *name,int sem,int *head,int n)
{
struct stud newStud;
int thead=*head;
newStud.flag='s';
strcpy(newStud.fname,name);
newStud.semester=sem;
Push(stack,&thead,&newStud,n);
*head=thead;
return 0;
}
int Push(struct MyStack *stack,int *head, void *elem,int n)
{
if(*head>=n-1)
return 0;
stack->stack[++*head]=elem;
return 1;
}

Answer 1

Your InitStack function should be
int InitStack(int size,struct MyStack *stack)
{
stack->size = size;
stack->stack= malloc(size * sizeof(void*));
stack->head=-1;
return 0;
}
The push function should be something like
int Push(struct MyStack *stack, void *str)
{
/* Check if stack is full */
stack->head++;
stack->stack[stack->head] = str;
return 0;
}
The you can use it as
struct stud s1;
struct prof p1;
Push(&NewStack, &s1);
Push(&NewStack, &p1);