#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){
    reset();
    int resp,date;
 
    while (1) {
        printf("1:+ 2:- 3:* 4:/ 5:push 9:answer\n");
        scanf("%d", &resp);
 
        if(resp==9){
        	break;
        }else{
        	switch(resp){
            	case 1:
            	push(pop()+pop());
            	break;
            	case 2:
            	push(pop()-pop());
            	break;
            	case 3:
            	push(pop()*pop());
            	break;
            	case 4:
            	push(pop()/pop());
            	break;
            	case 5:
            	printf("push:\n");
            	scanf("%d",&date);
            	push(date);
            	break;
        	}
        }
    }
    answer();
    return 0;
}
 
void push(double value) {
   if(isFull()!=0){
		stack[sp++]=value;
   }
}
 
double pop(void){
	if(isEmpty()!=0){
		return stack[--sp];
	}
	else return 1;
}
 
int isFull(void){
	if(sp>=SIZE){
		printf("スタックが満杯で入りませんでした\n");
		return 0;
	}
    else return 1;
}
 
int isEmpty(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 1;
}
 
void answer(void){
    printf("計算結果は%fです。\n",stack[0]);
}
 
void reset(void){
    sp=0;
}

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5
1
5
2
1
9