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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.  
  21.         scanf("%d", &n);
  22.  
  23.         switch(n){
  24.             case 1: {
  25.                 double b = pop();
  26.                 double a = pop();
  27.                 push(a + b);
  28.                 break;
  29.             }
  30.             case 2: {
  31.                 double b = pop();
  32.                 double a = pop();
  33.                 push(a - b);
  34.                 break;
  35.             }
  36.             case 3: {
  37.                 double b = pop();
  38.                 double a = pop();
  39.                 push(a * b);
  40.                 break;
  41.             }
  42.             case 4: {
  43.                 double b = pop();
  44.                 double a = pop();
  45.                 push(a / b);
  46.                 break;
  47.             }
  48.             case 5: {
  49.                 double x;
  50.                 scanf("%lf", &x);
  51.                 push(x);
  52.                 printf("data:%f\n", x);
  53.                 break;
  54.             }
  55.             case 9:
  56.                 answer();
  57.                 return 0;
  58.             default:
  59.                 return 0;
  60.         }
  61.     }
  62. }
  63.  
  64. void push(double value)
  65. {
  66.     if(!isFull()){
  67.         stack[sp++] = value;
  68.     }
  69. }
  70.  
  71. double pop(void)
  72. {
  73.     if(!isEmpty()){
  74.         return stack[--sp];
  75.     }
  76.     return 0;
  77. }
  78.  
  79. int isFull(void)
  80. {
  81.     return sp >= SIZE;
  82. }
  83.  
  84.  
  85. int isEmpty(void)
  86. {
  87.     return sp == 0;
  88. }
  89.  
  90. void answer(void)
  91. {
  92.     if(!isEmpty()){
  93.         printf("answer:%f\n", stack[sp-1]);
  94.     }
  95. }
  96.  
  97. void reset(void)
  98. {
  99.     sp = 0;
  100. }
  101.  
Success #stdin #stdout 0s 5296KB
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/Viaf9S
1
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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