#include <stdio.h>
 
#define SIZE 10
double stack[SIZE];
int sp;
 
void push(double value);
double pop(void);
int isFull(void);
int isEmpty(void);
void answer(void);
void reset(void);
 
int main(void) {
 
	sp=0;
	int resp;
	double a;
	double data1,data2;
	printf("足し算：1,引き算：2,掛け算：3,割り算：4,入力：5,結果表示：9\n");
 
	while(1)
	{
		scanf("%d",&resp);
		if(!resp) break;
		switch(resp)
		{
			case 1:
			{
				data1=pop();
				data2=pop();
				push(data1+data2);
				break;
			}
			case 2:
			{
				data1=pop();
				data2=pop();
				push(data2-data1);
				break;
			}
			case 3:
			{
				data1=pop();
				data2=pop();
				push(data1*data2);
				break;
			}
			case 4:
			{
				data1=pop();
				data2=pop();
				push(data2/data1);
				break;
			}
			case 5:
				scanf("%lf",&a);
				push(a);
				break;
			case 9:
			{
				answer();
				break;
			}
		}
 
	}
 
	return 0;
}
 
void push(double value)
{
	if(isFull())
	{
		printf("満杯で入りませんでした。");
		return;
	}
	else
	{
		stack[sp++]=value;
	}
}
 
double pop(void)
{
	if(isEmpty()) 
		return 0;
	else
		return stack[--sp];
}
 
int isFull(void)
{
	//1だったら満杯、0だったら満杯じゃない
	if(sp>=SIZE)
		return 1;
	else
		return 0;
}
 
int isEmpty(void)
{
	//1だったら空、0だったら空じゃない
	if(sp<=0)
		return 1;
	else
		return 0;
}
void answer(void)
{
	if(!isEmpty())
		printf("計算結果：%lf\n",stack[0]);
	else
		printf("スタックが空です。\n");
}
void reset(void)
{
	sp=0;
}
 

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

NQoxCjUKMgo5CjA=

5
1
5
2
9
0