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  1. #include <stdio.h>
  2.  
  3. #define SIZE 10
  4. double stack[SIZE];
  5. int sp;
  6.  
  7. void push(double value);
  8. double pop(void);
  9. int isFull(void);
  10. int isEmpty(void);
  11. void answer(void);
  12. void reset(void);
  13.  
  14. int main(void)
  15. {
  16.     int cmd;
  17.     double a, b, num;
  18. 	int isEnd=0;
  19.  
  20.     reset();
  21.     while (1)
  22.     {
  23.         scanf("%d", &cmd);
  24.  
  25.         switch (cmd)
  26.         {
  27.         case 1:
  28.             if (sp >= 2) 
  29. 			{
  30.                 b = pop();
  31.                 a = pop();
  32.                 push(a + b);
  33.             } 
  34. 			else 
  35. 			{
  36.                 printf("スタックが足りません\n");
  37.             }
  38.             break;
  39.         case 2:
  40.             if (sp >= 2) 
  41. 			{
  42.                 b = pop();
  43.                 a = pop();
  44.                 push(a - b);
  45.             } 
  46. 			else 
  47. 			{
  48.                 printf("スタックが足りません\n");
  49.             }
  50.             break;
  51.         case 3:
  52.             if (sp >= 2) 
  53. 			{
  54.                 b = pop();
  55.                 a = pop();
  56.                 push(a * b);
  57.             } 
  58. 			else 
  59. 			{
  60.                 printf("スタックが足りません\n");
  61.             }
  62.             break;
  63.         case 4:
  64.             if (sp >= 2) 
  65. 			{
  66.                 b = pop();
  67.                 a = pop();
  68.                 if (b != 0)
  69.                     push(a / b);
  70.                 else
  71.                     printf("0で割れません\n");
  72.             } 
  73. 			else 
  74. 			{
  75.                 printf("スタックが足りません\n");
  76.             }
  77.             break;
  78.         case 5:
  79.             scanf("%lf", &num);
  80. 			printf("data:%lf\n",num);
  81.             push(num);
  82.             break;
  83.         case 9:
  84. 			isEnd = 1;
  85.         }
  86. 	if (isEnd == 1)
  87. 		break;
  88.     }
  89.  
  90. 	answer();
  91.  
  92. 	return 0;
  93.  
  94. }
  95.  
  96. void push(double value)
  97. {
  98.     if (!isFull()) 
  99. 	{
  100.         stack[sp++] = value;
  101.     } 
  102. 	else 
  103. 	{
  104.         printf("スタックが満杯で入りませんでした\n");
  105.     }
  106. }
  107.  
  108. double pop(void)
  109. {
  110.     if (!isEmpty()) 
  111. 	{
  112.         return stack[--sp];
  113.     } 
  114. 	else 
  115. 	{
  116.         printf("スタックが空で取り出せませんでした\n");
  117.         return 0.0;
  118.     }
  119. }
  120.  
  121. int isFull(void)
  122. {
  123.     return sp >= SIZE;
  124. }
  125.  
  126. int isEmpty(void)
  127. {
  128.     return sp <= 0;
  129. }
  130.  
  131. void answer(void)
  132. {
  133.     if (!isEmpty()) 
  134. 	{
  135.         printf("answer: %lf\n", stack[sp - 1]);
  136.     } 
  137. 	else 
  138. 	{
  139.         printf("スタックが空で何も取り出せませんでした\n");
  140.     }
  141. }
  142.  
  143. void reset(void)
  144. {
  145.     sp = 0;
  146. }
  147.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
5
1
5
2
1
9
stdout 
data:1.000000
data:2.000000
answer: 3.000000
https://ideone.com/ITmQ9b
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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