1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #define STACK_SIZE 100
 4 typedef struct Stack
 5 {
 6     int top;
 7     int stack[STACK_SIZE];
 8 }Stack;
 9 void InitStack(Stack *s)
10 {
11     s->top=-1;
12 }
13 int IsEmpty(Stack *s)
14 {
15     return s->top==-1? 1:0;
16 }
17 int IsFull(Stack *s)
18 {
19     if(s->top>=STACK_SIZE-1)
20         return 1;
21     return 0;
22 }
23 int Pop(Stack *s)
24 {
25     if(!IsEmpty(s))
26     {
27         s->top--;
28         return s->stack[s->top+1];
29     }
30     return -1;
31 }
32 void Push(Stack *s,int m)
33 {
34     if(!IsFull(s))
35     {
36         s->top++;
37         s->stack[s->top]=m;
38     }
39 }
40 int main()
41 {
42     Stack *s=(Stack*)malloc(sizeof(Stack));
43     InitStack(s);
44     Push(s,2);
45     Push(s,8);
46     Push(s,10);
47     printf("%3d",Pop(s));
48     return 0;
49 }