fork(1) download 
  1.  
  2. #include<stdio.h>
  3.  
  4. #define SIZE 10
  5. double stack[SIZE];
  6. int sp;
  7.  
  8. void push(double value);
  9. double pop(void);
  10. int isFull(void);
  11. int isEmpty(void);
  12. void answer(void);
  13. void reset(void);
  14.  
  15. int main(void)
  16. {
  17.     reset();
  18.     int n;
  19. double value, a, b;
  20.  
  21. while(1){
  22.     scanf("%d", &n);
  23.  
  24.     switch(n){
  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", &value);
  51.             printf("data:%f\n", value);
  52.             push(value);
  53.             break;
  54.  
  55.         case 9:
  56.             break;
  57.     }
  58.  
  59.     if(n == 9){
  60.         break;
  61.     }
  62. }
  63.  
  64.  
  65.  
  66.  
  67.     answer();
  68.  
  69.     return 0;
  70. }
  71.  
  72. void push(double value)
  73. {
  74. 	if(!isFull()){
  75.     stack[sp] = value;
  76.     sp++;
  77. }
  78.  
  79. }
  80. double pop(void)
  81. {
  82. 	if(!isEmpty()){
  83.     sp--;
  84.     return stack[sp];
  85. }
  86. return 0;
  87. }
  88.  
  89. int isFull(void)
  90. {
  91.  
  92. return sp == SIZE;
  93. }
  94.  
  95. int isEmpty(void)
  96. {
  97. return sp == 0;
  98. }
  99.  
  100. void answer(void)
  101. {
  102. if(!isEmpty()){
  103.     printf("answer:%f\n", stack[sp-1]);
  104. }
  105. }
  106.  
  107. void reset(void)
  108. {
  109.  
  110. sp = 0;
  111. }
  112.  
  113.  
  114.  
  115.  
  116.  
  117.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
5 1 5 2 9
stdout 
data:1.000000
data:2.000000
answer:2.000000
https://ideone.com/7JUDoU
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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