#include <stdio.h>
#define SIZE 5
int stack[SIZE];
int sp;
 
void push(int value);
 
int pop(void);
 
int main(void)
 
{
  sp = 0;
  int resp, data;
 
  while(1){
    printf("1:push, 2:pop, 0:end : ");
    scanf("%d", &resp);
 
    if(!resp) break;
 
    switch(resp){
 
      case 1: printf("push : "); scanf("%d", &data);
              push(data);
              break;
      case 2: pop();
              break;
    }
    printf("sp=%d\n",sp);
  }
  printf("\n");
  for(int i=0; i<sp; i++){
    printf("stack[%d]=%d \n", i, stack[i]);
  }
 
  return 0;
}
 
 
  void push(int value)
    {
    if(sp >= SIZE){
    printf("スタックが満杯で入りませんでした\n");
    }else{
      stack[sp++] = value;
 
    } 
  }
 
  int pop(void)
  {
    if(sp<= 0){
 
      printf("スタックが空で取り出せませんでした。\n");
      return 0;
    }else{
      return stack[--sp];
    }
  }
 

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