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  1. #include <stdio.h>  
  2. #define SIZE 10 
  3. double stack[SIZE];
  4. int sp=0;  
  5. void push(double value);  
  6. double pop(void);     
  7. int isFull(void);
  8. int isEmpty(void);         
  9. void answer(void);          
  10. void reset(void);          
  11.  
  12. int main(void) {     
  13. reset();      
  14. while(1) {           
  15. int resp,data;         
  16. double a, b;
  17. scanf("%d",&resp);
  18. if (!resp)
  19. break;
  20.  
  21. switch(resp) {             
  22. case 1:            
  23. a= pop();                
  24. b= pop();                 
  25. push(a + b);                 
  26. break;
  27.  
  28. case 2:                 
  29. a= pop();
  30. b= pop();                
  31. push(a - b);                 
  32. break;         
  33.  
  34. case 3:
  35. a= pop(); 
  36. b= pop();                
  37. push(a*b);                 
  38. break;             
  39.  
  40. case 4:
  41. a= pop();               
  42. b= pop();                 
  43. if(b != 0)
  44.   push(a/b);
  45. else
  46. printf("無効な値です\n"); 
  47. break; 
  48.  
  49. case 5:
  50. scanf("%d",&data);
  51. push(data);           
  52. break;
  53.  
  54. case 9:
  55. answer();                 
  56. return 0;
  57.     }   
  58.   }
  59. }
  60.  
  61. void push(double x){
  62.   if (isFull()){
  63.     printf("スタックが満杯です\n");
  64.     }
  65.   else {
  66.     stack[sp++] = x;
  67.     }
  68. }  
  69.  
  70. double pop(void){
  71.   if (isEmpty()){
  72.     printf("スタックが空です\n");
  73. return 0;
  74.   }
  75.   else{
  76.     return stack[--sp];
  77.   }
  78. } 
  79. int isFull(void){
  80.   return sp >= SIZE; 
  81. }  
  82. int isEmpty(void){
  83.   return sp == 0;
  84. } 
  85. void answer(void) {   
  86.   if (!isEmpty()){
  87.     printf("答えは %fです\n", stack[sp-1]);
  88.      } 
  89.   else{
  90.     printf("スタックは空です\n");
  91.   }
  92.  } 
  93.  
  94. void reset(void){
  95.   sp = 0; 
  96. }
Success #stdin #stdout 0s 5276KB
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答えは 3.000000です
https://ideone.com/7A0TFq
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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