error C2679: binary '=' :

#include <stdio.h>
#include <stdlib.h>
#define TRUE 1
#define FALSE 0
typedef int ElemType;
//定义链栈结点类型
typedef struct node
{
    ElemType data;
    struct node *next;
}StackNode,*LinkStack;


void InitStack(LinkStack *top)
{    
    *top=(LinkStack)malloc(sizeof(StackNode));
    (*top)->next = NULL;
}


int Push(LinkStack top, ElemType x)
{
    StackNode *NewNode;
    NewNode=(StackNode*)malloc(sizeof(StackNode));
    if(NewNode==NULL)
        return (FALSE);
    else
    {
        NewNode->data=x;
        NewNode->next=*top->next;
        *top->next=NewNode;
        return (TRUE);
    }
}