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  1. #include <stdio.h>
  2.  
  3. #define SIZE 10
  4. double stack[SIZE];
  5. int sp;
  6.  
  7. // 関数のプロトタイプ宣言
  8. void push(double value);
  9. double pop(void);
  10. int isFull(void);
  11. int isEmpty(void);
  12. void answer(void);
  13. void reset(void);
  14.  
  15. int main(void) {
  16.     reset();
  17.     while (1) {
  18.         int mode;
  19.         double a, b;
  20.         scanf("%d", &mode);
  21.         switch (mode) {
  22.             case 1:
  23.                 b = pop();
  24.                 a = pop();
  25.                 push(a + b);
  26.                 break;
  27.             case 2:
  28.                 b = pop();
  29.                 a = pop();
  30.                 push(a - b);
  31.                 break;
  32.             case 3:
  33.                 b = pop();
  34.                 a = pop();
  35.                 push(a * b);
  36.                 break;
  37.             case 4:
  38.                 b = pop();
  39.                 a = pop();
  40.                 push(a / b);
  41.                 break;
  42.             case 5:
  43.                 scanf("%lf", &a);
  44.                 push(a);
  45.                 break;
  46.             case 9:
  47.                 answer();
  48.                 return 0;
  49.             default:
  50.                 break;
  51.         }
  52.     }
  53.     return 0;
  54. }
  55.  
  56. // (2) push
  57. void push(double value) {
  58.     if (isFull()) return;
  59.     stack[sp] = value;
  60.     sp++;
  61. }
  62.  
  63. // (3) pop
  64. double pop(void) {
  65.     if (isEmpty()) return 0;
  66.     sp--;
  67.     return stack[sp];
  68. }
  69.  
  70. // (4) isFull
  71. int isFull(void) {
  72.     return sp >= SIZE;
  73. }
  74.  
  75. // (5) isEmpty
  76. int isEmpty(void) {
  77.     return sp <= 0;
  78. }
  79.  
  80. // (6) answer
  81. void answer(void) {
  82.     if (!isEmpty()) {
  83.         printf("ans = %f\n", stack[sp - 1]);
  84.     }
  85. }
  86.  
  87. // (7) reset
  88. void reset(void) {
  89.     sp = 0;
  90. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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5
3
5
5
1
9
stdout
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ans = 8.000000
https://ideone.com/xR6qjI
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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