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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.             push(num);
  81.             break;
  82.         case 9:
  83. 			isEnd = 1;
  84.         }
  85. 	if (isEnd == 1)
  86. 		break;
  87.     }
  88.  
  89. 	answer();
  90.  
  91. 	return 0;
  92.  
  93. }
  94.  
  95. void push(double value)
  96. {
  97.     if (!isFull()) {
  98.         stack[sp++] = value;
  99.     } else {
  100.         printf("スタックが満杯で入りませんでした\n");
  101.     }
  102. }
  103.  
  104. double pop(void)
  105. {
  106.     if (!isEmpty()) {
  107.         return stack[--sp];
  108.     } else {
  109.         printf("スタックが空で取り出せませんでした\n");
  110.         return 0.0;
  111.     }
  112. }
  113.  
  114. int isFull(void)
  115. {
  116.     return sp >= SIZE;
  117. }
  118.  
  119. int isEmpty(void)
  120. {
  121.     return sp <= 0;
  122. }
  123.  
  124. void answer(void)
  125. {
  126.     if (!isEmpty()) {
  127.         printf("answer: %lf\n", stack[sp - 1]);
  128.     } else {
  129.         printf("スタックが空で何も取り出せませんでした\n");
  130.     }
  131. }
  132.  
  133. void reset(void)
  134. {
  135.     sp = 0;
  136. }
  137.  
Success #stdin #stdout 0.01s 5284KB
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5
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stdout
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answer: 3.000000
https://ideone.com/pwgRO9
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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