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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.  
  19.     reset();
  20.     while (1)
  21.     {
  22.         scanf("%d", &cmd);
  23.  
  24.         switch (cmd)
  25.         {
  26.         case 1:
  27.             if (sp >= 2) 
  28. 			{
  29.                 b = pop();
  30.                 a = pop();
  31.                 push(a + b);
  32.             } 
  33. 			else 
  34. 			{
  35.                 printf("スタックが足りません\n");
  36.             }
  37.             break;
  38.         case 2:
  39.             if (sp >= 2) 
  40. 			{
  41.                 b = pop();
  42.                 a = pop();
  43.                 push(a - b);
  44.             } 
  45. 			else 
  46. 			{
  47.                 printf("スタックが足りません\n");
  48.             }
  49.             break;
  50.         case 3:
  51.             if (sp >= 2) 
  52. 			{
  53.                 b = pop();
  54.                 a = pop();
  55.                 push(a * b);
  56.             } 
  57. 			else 
  58. 			{
  59.                 printf("スタックが足りません\n");
  60.             }
  61.             break;
  62.         case 4:
  63.             if (sp >= 2) 
  64. 			{
  65.                 b = pop();
  66.                 a = pop();
  67.                 if (b != 0)
  68.                     push(a / b);
  69.                 else
  70.                     printf("0で割れません\n");
  71.             } 
  72. 			else 
  73. 			{
  74.                 printf("スタックが足りません\n");
  75.             }
  76.             break;
  77.         case 5:
  78.             scanf("%lf", &num);
  79.             push(num);
  80.             break;
  81.         case 9:
  82. 			answer();
  83. 			return 0;
  84.         }
  85.     }
  86.  
  87. 	answer();
  88.  
  89. 	return 0;
  90.  
  91. }
  92.  
  93. void push(double value)
  94. {
  95.     if (!isFull()) {
  96.         stack[sp++] = value;
  97.     } else {
  98.         printf("スタックが満杯で入りませんでした\n");
  99.     }
  100. }
  101.  
  102. double pop(void)
  103. {
  104.     if (!isEmpty()) {
  105.         return stack[--sp];
  106.     } else {
  107.         printf("スタックが空で取り出せませんでした\n");
  108.         return 0.0;
  109.     }
  110. }
  111.  
  112. int isFull(void)
  113. {
  114.     return sp >= SIZE;
  115. }
  116.  
  117. int isEmpty(void)
  118. {
  119.     return sp <= 0;
  120. }
  121.  
  122. void answer(void)
  123. {
  124.     if (!isEmpty()) {
  125.         printf("答え: %lf\n", stack[sp - 1]);
  126.     } else {
  127.         printf("スタックが空で何も取り出せませんでした\n");
  128.     }
  129. }
  130.  
  131. void reset(void)
  132. {
  133.     sp = 0;
  134. }
  135.  
Success #stdin #stdout 0.01s 5292KB
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答え: 3.000000
https://ideone.com/VrIISY
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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