[c] Stack

 
#include 
#include 
#define MAXSIZE 100 
 
typedef struct stack{
    int stk[MAXSIZE];
    int top;
} STACK;
 
 
void Push(int x, STACK *s){
    int num;
    s->top ++; 
    printf("Push %d\n", s->top);
    s->stk[s->top] = x;
    return;
}
 
int Pop(STACK *s){
    int num;
    printf("Pop %d\n", s->top);
    num = s->stk[s->top];
    s->top --; 
    return num;
}
 
void Init(STACK *s){
    s->top = -1; 
    printf("Init %d\n", s->top);
    return;
}
 
int main(){
 
    STACK *s = (STACK *)malloc(sizeof(STACK));
 
    Init(s);
 
    Push(1, s); 
    Push(2, s); 
    Push(3, s); 
 
    printf("%d\n", Pop(s));
    printf("%d\n", Pop(s));
    printf("%d\n", Pop(s));
 
}