进制转换 输出停不下来

#include
#include
#include
using namespace std;

#define OK 1
#define ERROR 0
#define OVERFLOW -2
#define N 888
typedef int Status;
typedef int SElemType;
typedef int ElemType;

typedef struct StackNode
{
ElemType data;
struct StackNode *next;
}StackNode,*LinkStack;

Status InitStack(LinkStack &S)
{
S=NULL;
return OK;
}
Status Push(LinkStack &S,SElemType e)
{ LinkStack p;
p=new StackNode;
p->data=e;
p->next=S;
S=p;
return OK;
}
Status Pop(LinkStack &S,SElemType e)
{
LinkStack p;
if(S==NULL)return ERROR;
p=S;
e=S->data;

S=S->next;
delete p;
return OK;

}
SElemType GetTop(LinkStack S)
{
if(S!=NULL)
return S->data;
}

int StackEmpty(LinkStack S)
{//判定栈是否非空，空返回1，非空返回0
if (S=NULL) //栈空
return 1;
else
return 0;
}

void conversion(int a)
{ SElemType e;
LinkStack S=NULL;

while(a!=0)
{
    Push(S,a%8);
    a=a/8;

}
while(StackEmpty(S)==0)
{
    Pop(S,e);
    cout<<e;
}

}

int main()
{

conversion(N);

}

你把==写成=了

 int StackEmpty(LinkStack S)
{
    if (S = NULL) //ERROR
        return 1;
    else
        return 0;
}

pop函数也有点小问题,应该写成这样

 Status Pop(LinkStack &S, SElemType *e)
{
    LinkStack p;
    if (S == NULL)return ERROR;
    p = S;
    *e = S->data;
    S = S->next;
    delete p;
    return OK;
}

调用时Pop(S, &e);

if (S = NULL)
->
if (S == NULL)