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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.     int resp;
  18.     double data;
  19.  
  20.     while(1){
  21.         scanf("%d",&resp);
  22.         switch(resp){
  23.             case 1: {   
  24.                 double b = pop();
  25.                 double a = pop();
  26.                 push(a + b);
  27.                 break;
  28.             }
  29.             case 2: {   
  30.                 double b = pop();
  31.                 double a = pop();
  32.                 push(a - b);
  33.                 break;
  34.             }
  35.             case 3: {  
  36.                 double b = pop();
  37.                 double a = pop();
  38.                 push(a * b);
  39.                 break;
  40.             }
  41.             case 4: {  
  42.                 double b = pop();
  43.                 double a = pop();
  44.                 push(a / b);
  45.                 break;
  46.             }
  47.             case 5:     
  48.                 printf("data:");
  49.                 scanf("%lf",&data);
  50.                 printf("%f\n",data);
  51.                 push(data);
  52.                 break;
  53.             case 9:   
  54.                 answer();
  55.                 return 0;
  56.  
  57.         }
  58.     }
  59.  
  60.     return 0;
  61. }
  62.  
  63. void push(double value)
  64. {
  65.     if(isFull()){
  66.         printf("スタックは満杯で入りきりません\n");
  67.     } else {
  68.         stack[sp++] = value;
  69.     }
  70. }
  71.  
  72. double pop(void)
  73. {
  74.     if(isEmpty()){
  75.         printf("スタックは空で取り出せません!\n");
  76.         return 0;
  77.     } else {
  78.         return stack[--sp];
  79.     }
  80. }
  81.  
  82. int isFull(void)
  83. {
  84.     return sp >= SIZE;
  85. }
  86.  
  87. int isEmpty(void)
  88. {
  89.     return sp <= 0;
  90. }
  91.  
  92. void answer(void)
  93. {
  94.     if(!isEmpty()){
  95.         printf("Answer:%f\n", stack[sp-1]);
  96.     } else {
  97.         printf("スタックは空です\n");
  98.     }
  99. }
  100.  
  101. void reset(void)
  102. {
  103.     sp = 0;
  104.  
  105. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
copy 
5
1
5
2
1
9
stdout
copy 
data:1.000000
data:2.000000
Answer:3.000000
https://ideone.com/BwAU9K
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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