#include<iostream>

#include<malloc.h>

using namespace std;

#define Elementtype unsigned int

#define maxSize 100

#define error string::npos

/*順序棧*/

typedef struct aaa *stack;

struct aaa{

int top;

Elementtype b[maxSize];

};

stack createStack(){

stack s=(stack )malloc(sizeof(struct aaa));

s->top=-1;

return s;

}

Elementtype pop(stack s){

if(s->top<=-1||s->top+1>maxSize){return error;}

else {

    return s->b[s->top--];

}

}

bool push(stack s,Elementtype a){

if(s->top+1>=maxSize||s->top<-1){return false;}

else {

s->b[++s->top]=a;

return true;

}

}

int main(){

stack s=createStack();

for(int i=1;i<=100;i++){

push(s,i);

}

cout<<pop(s)<<endl;

cout<<pop(s)<<endl;

return 0;

}