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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.     reset();
  17.  
  18.     while(1) {
  19.         int n;
  20.         double x, y;
  21.         scanf("%d", &n);
  22.  
  23.         switch(n) {
  24.             case 1:
  25.                 y = pop();
  26.                 x = pop();
  27.                 push(x + y);
  28.                 break;
  29.             case 2:  // 引き算
  30.                 y = pop();
  31.                 x = pop();
  32.                 push(x - y);
  33.                 break;
  34.             case 3:  // 掛け算
  35.                 y = pop();
  36.                 x = pop();
  37.                 push(x * y);
  38.                 break;
  39.             case 4:  // 割り算
  40.                 y = pop();
  41.                 x = pop();
  42.                 push(x / y);
  43.                 break;
  44.             case 5:  // データ入力
  45.                 scanf("%lf", &x);
  46.                 push(x);
  47.                 break;
  48.             case 9:  // 結果表示
  49.                 answer();
  50.                 return 0;
  51.         }
  52.     }
  53. }
  54.  
  55. void push(double value)
  56. {
  57.     if(isFull()) {
  58.         printf("Error: stack overflow\n");
  59.     } else {
  60.         stack[sp++] = value;
  61.         printf("data:%f\n", value);
  62.     }
  63. }
  64.  
  65. double pop(void)
  66. {
  67.     if(isEmpty()) {
  68.         printf("Error: stack underflow\n");
  69.         return 0.0;
  70.     } else {
  71.         return stack[--sp];
  72.     }
  73. }
  74.  
  75. int isFull(void)
  76. {
  77.     return sp >= SIZE;
  78. }
  79.  
  80. int isEmpty(void)
  81. {
  82.     return sp <= 0;
  83. }
  84.  
  85. void answer(void)
  86. {
  87.     if(!isEmpty()) {
  88.         printf("answer:%f\n", pop());
  89.     }
  90. }
  91.  
  92. void reset(void)
  93. {
  94.     sp = 0;
  95. }
  96.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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5 6 5 2 8 9
stdout
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data:6.000000
data:2.000000
answer:2.000000
https://ideone.com/3dJ4yq
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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