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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.     reset();
  16.     while (1) {
  17.         int mode;
  18.         double a, b;
  19.         scanf("%d", &mode);
  20.         switch (mode) {
  21.             case 1:
  22.                 b = pop();
  23.                 a = pop();
  24.                 push(a + b);
  25.                 break;
  26.             case 2:
  27.                 b = pop();
  28.                 a = pop();
  29.                 push(a - b);
  30.                 break;
  31.             case 3:
  32.                 b = pop();
  33.                 a = pop();
  34.                 push(a * b);
  35.                 break;
  36.             case 4:
  37.                 b = pop();
  38.                 a = pop();
  39.                 push(a / b);
  40.                 break;
  41.             case 5:
  42.                 scanf("%lf", &a);
  43.                 push(a);
  44.                 printf("data:%f\n", a);
  45.                 break;
  46.             case 9:
  47.                 answer();
  48.                 return 0;
  49.             default:
  50.                 break;
  51.         }
  52.     }
  53.     return 0;
  54. }
  55.  
  56. void push(double value) {
  57.     if (isFull()) return;
  58.     stack[sp] = value;
  59.     sp++;
  60. }
  61.  
  62. double pop(void) {
  63.     if (isEmpty()) return 0;
  64.     sp--;
  65.     return stack[sp];
  66. }
  67.  
  68. int isFull(void) {
  69.     return sp >= SIZE;
  70. }
  71.  
  72. int isEmpty(void) {
  73.     return sp <= 0;
  74. }
  75.  
  76. void answer(void) {
  77.     if (!isEmpty()) {
  78.         printf("answer:%f\n", stack[sp - 1]);
  79.     }
  80. }
  81.  
  82. void reset(void) {
  83.     sp = 0;
  84. }
Success #stdin #stdout 0s 5328KB
comments (?)
stdin 
5
8
5
2
1
5
2
5
3
1
4
9
stdout 
data:8.000000
data:2.000000
data:2.000000
data:3.000000
answer:2.000000
https://ideone.com/9IJS9Q
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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