#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) {
int resp,i;
double data;
reset();
while (1) {
scanf("%d", &resp);
if(resp==9)
break;
switch (resp) {
case 1:
push(pop() + pop());
break;
case 2:
{
double b = pop();
double a = pop();
push(a - b);
}
break;
case 3:
push(pop() * pop());
break;
case 4:
{
double d = pop();
double c = pop();
if (d != 0) {
push(c / d);
} else {
printf("0では割れません\n");
}
}
break;
case 5:
scanf("%lf", &data);
push(data);
printf("data: %lf\n", data);
break;
}
}
answer();
return 0;
}
void push(double value) {
if (isFull()) {
printf("スタックが満タンで入りません\n");
} else {
stack[sp++] = value;
}
}
double pop(void) {
if (isEmpty()) {
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];
}
}
int isFull(void) {
if(sp >= SIZE){
return 5;
}else
return 0;
}
int isEmpty(void) {
if(sp <= 0){
return 5;
}else
return 0;
}
void answer(void) {
printf("answer: %lf\n", stack[sp-1]);
}
void reset(void) {
sp = 0;
}
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