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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 select;
  20.         double d, val1, val2;
  21.  
  22.         scanf("%d", &select);
  23.         switch(select){
  24.             case 1:
  25.                 val2 = pop();
  26.                 val1 = pop();
  27.                 push(val1 + val2);
  28.                 break;
  29.             case 2:
  30.                 val2 = pop();
  31.                 val1 = pop();
  32.                 push(val1 - val2);
  33.                 break;
  34.             case 3:
  35.                 val2 = pop();
  36.                 val1 = pop();
  37.                 push(val1 * val2);
  38.                 break;
  39.             case 4:
  40.                 val2 = pop();
  41.                 val1 = pop();
  42.                 push(val1 / val2);
  43.                 break;
  44.             case 5:
  45.                 scanf("%lf", &d);
  46.                 push(d);
  47.                 printf("data:%f\n", d);
  48.                 break;
  49.             case 9:
  50.                 goto end_loop;
  51.             default:
  52.                 break;
  53.         }
  54.     }
  55.     end_loop:
  56.  
  57.     answer();
  58.     return 0;
  59. }
  60.  
  61. void push(double value)
  62. {
  63.     if (isFull()) {
  64.         return;
  65.     }
  66.     stack[sp] = value;
  67.     sp++;
  68. }
  69.  
  70. double pop(void)
  71. {
  72.     if (isEmpty()) {
  73.         return 0.0;
  74.     }
  75.     sp--;
  76.     return stack[sp];
  77. }
  78.  
  79. int isFull(void)
  80. {
  81.     if (sp >= SIZE) {
  82.         return 1;
  83.     }
  84.     return 0;
  85. }
  86.  
  87. int isEmpty(void)
  88. {
  89.     if (sp <= 0) {
  90.         return 1;
  91.     }
  92.     return 0;
  93. }
  94.  
  95. void answer(void)
  96. {
  97.     printf("answer:%f\n", stack[0]);
  98. }
  99.  
  100. void reset(void)
  101. {
  102.     sp = 0;
  103. }
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/0AEBly
language:
C (gcc 8.3)
created:
6 hours ago
visibility:
public

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