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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 menu;
  20.         double data;
  21.         double a,b;
  22.  
  23.         scanf("%d",&menu);
  24.  
  25.         switch(menu){
  26.         case 1:     // +
  27.             b = pop();
  28.             a = pop();
  29.             push(a+b);
  30.             break;
  31.  
  32.         case 2:     // -
  33.             b = pop();
  34.             a = pop();
  35.             push(a-b);
  36.             break;
  37.  
  38.         case 3:     // *
  39.             b = pop();
  40.             a = pop();
  41.             push(a*b);
  42.             break;
  43.  
  44.         case 4:     // /
  45.             b = pop();
  46.             a = pop();
  47.             push(a/b);
  48.             break;
  49.  
  50.         case 5:     // データ入力
  51.             scanf("%lf",&data);
  52.             push(data);
  53.             printf("data:%lf\n",data);
  54.             break;
  55.  
  56.         case 9:     // 終了
  57.             answer();
  58.             return 0;
  59.         }
  60.     }
  61.  
  62.     answer();
  63.  
  64.     return 0;
  65. }
  66.  
  67. void push(double value)
  68. {
  69.     if(!isFull())
  70.         stack[sp++] = value;
  71. }
  72.  
  73. double pop(void)
  74. {
  75.     if(!isEmpty())
  76.         return stack[--sp];
  77.  
  78.     return 0;
  79. }
  80.  
  81. int isFull(void)
  82. {
  83.     return sp >= SIZE;
  84. }
  85.  
  86. int isEmpty(void)
  87. {
  88.     return sp == 0;
  89. }
  90.  
  91. void answer(void)
  92. {
  93.     printf("\nanswer:%lf\n", pop());
  94. }
  95.  
  96. void reset(void)
  97. {
  98.     sp = 0;
  99. }
  100.  
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
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5 1 5 2 1 9
stdout
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data:1.000000
data:2.000000

answer:3.000000
https://ideone.com/78RD3s
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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