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  1.  
  2. #include <stdio.h>
  3.  
  4. #define SIZE 10
  5.  
  6. double stack[SIZE];
  7. int sp;
  8.  
  9. void push(double value);
  10. double pop(void);
  11. int isFull(void);
  12. int isEmpty(void);
  13. void answer(void);
  14. void reset(void);
  15.  
  16. int main(void)
  17. {
  18.     int n;
  19.     double a, b;
  20.  
  21.     reset();
  22.  
  23.     while (1) {
  24.         scanf("%d", &n);
  25.  
  26.         switch (n) {
  27.             case 1:
  28.                 b = pop();
  29.                 a = pop();
  30.                 push(a + b);
  31.                 break;
  32.  
  33.             case 2:
  34.                 b = pop();
  35.                 a = pop();
  36.                 push(a - b);
  37.                 break;
  38.  
  39.             case 3:
  40.                 b = pop();
  41.                 a = pop();
  42.                 push(a * b);
  43.                 break;
  44.  
  45.             case 4:
  46.                 b = pop();
  47.                 a = pop();
  48.                 push(a / b);
  49.                 break;
  50.  
  51.             case 5:
  52.                 scanf("%lf", &a);
  53.                 push(a);
  54.                 printf("data:%f\n", a);
  55.                 break;
  56.  
  57.             case 9:
  58.                 goto end;
  59.         }
  60.     }
  61.  
  62. end:
  63.     answer();
  64.     return 0;
  65. }
  66.  
  67. void push(double value){
  68.     if (!isFull()) {
  69.         stack[sp] = value;
  70.         sp++;
  71.     }
  72. }
  73.  
  74. double pop(void){
  75.     if (!isEmpty()) {
  76.         sp--;
  77.         return stack[sp];
  78.     }
  79.     return 0;
  80. }
  81.  
  82. int isFull(void){
  83.     return sp >= SIZE;
  84. }
  85.  
  86. int isEmpty(void){
  87.     return sp == 0;
  88. }
  89.  
  90. void answer(void){
  91.     if (!isEmpty()) {
  92.         printf("\nanswer:%f\n", pop());
  93.     }
  94. }
  95.  
  96. void reset(void){
  97.     sp = 0;
  98. }
  99.  
  100.  
Success #stdin #stdout 0.01s 5320KB
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/p42UaI
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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