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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.     int command;
  17.     double a, b;
  18.  
  19.     reset();
  20.  
  21.     while(1){
  22.         scanf("%d", &command);
  23.  
  24.         switch(command){
  25.             case 1:
  26.                 b = pop();
  27.                 a = pop();
  28.                 push(a + b);
  29.                 break;
  30.  
  31.             case 2:
  32.                 b = pop();
  33.                 a = pop();
  34.                 push(a - b);
  35.                 break;
  36.  
  37.             case 3:
  38.                 b = pop();
  39.                 a = pop();
  40.                 push(a * b);
  41.                 break;
  42.  
  43.             case 4:
  44.                 b = pop();
  45.                 a = pop();
  46.                 push(a / b);
  47.                 break;
  48.  
  49.             case 5:
  50.                 scanf("%lf", &a);
  51.                 push(a);
  52.                 break;
  53.  
  54.             case 9:
  55.                 break;
  56.         }
  57.  
  58.         if(command == 9)
  59.             break;
  60.     }
  61.  
  62.     answer();
  63.  
  64.     return 0;
  65. }
  66.  
  67. void push(double value)
  68. {
  69.     if(!isFull()){
  70.         stack[sp] = value;
  71.         sp++;
  72.         printf("data:%f\n", value);
  73.     }
  74. }
  75.  
  76. double pop(void)
  77. {
  78.     double value;
  79.  
  80.     if(!isEmpty()){
  81.         sp--;
  82.         value = stack[sp];
  83.         return value;
  84.     }
  85.  
  86.     return 0;
  87. }
  88.  
  89. int isFull(void)
  90. {
  91.     return sp == SIZE;
  92. }
  93.  
  94. int isEmpty(void)
  95. {
  96.     return sp == 0;
  97. }
  98.  
  99. void answer(void)
  100. {
  101.     if(!isEmpty()){
  102.         printf("answer:%f\n", stack[sp - 1]);
  103.     }
  104. }
  105.  
  106. void reset(void)
  107. {
  108.     sp = 0;
  109. }
Success #stdin #stdout 0s 5324KB
comments (?)
stdin
copy 
5
1
2
5
1
9
stdout
copy 
data:1.000000
data:-1.000000
data:1.000000
answer:1.000000
https://ideone.com/u0d5Cy
language:
C99 (gcc 8.3)
created:
11 hours ago
visibility:
public

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