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  1. #include <stdio.h>
  2. #define SIZE 10
  3.  
  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.     int resp,a, b, data;
  17.  
  18.     reset();
  19.  
  20.     while (1) {
  21.         scanf("%d", &resp);
  22.  if(resp==9) break;
  23.         switch (resp) {
  24.             case 1:
  25.                 if (sp >= 2) {
  26.                     b = pop();
  27.                     a = pop();
  28.                     push(a + b);
  29.                 }
  30.                 break;
  31.             case 2:
  32.                 if (sp >= 2) {
  33.                     b = pop();
  34.                     a = pop();
  35.                     push(a - b);
  36.                 }
  37.                 break;
  38.             case 3:
  39.                 if (sp >= 2) {
  40.                     b = pop();
  41.                     a = pop();
  42.                     push(a * b);
  43.                 }
  44.                 break;
  45.             case 4:
  46.                 if (sp >= 2) {
  47.                     b = pop();
  48.                     a = pop();
  49.                     if (b != 0) {
  50.                         push(a / b);
  51.                     } else {
  52.                         push(a); push(b);
  53.                     }
  54.                 }
  55.                 break;
  56.             case 5:
  57.                 scanf("%d", &data);
  58.                 push(data);
  59.                 break;
  60.         }
  61.     }
  62.     answer();
  63.     return 0;
  64. }
  65.  
  66. void push(double value)
  67. {
  68.     if (isFull()) {
  69.         printf("スタックは満杯\n");
  70.     } else {
  71.         stack[sp++] = value;
  72.     }
  73. }
  74.  
  75. double pop(void)
  76. {
  77.     if (isEmpty()) {
  78.         printf("スタックは空\n");
  79.         return 0;
  80.     } else {
  81.          return stack[--sp];
  82.     }
  83. }
  84.  
  85. int isFull(void)
  86. {
  87.    if(sp>=SIZE){
  88.    	return 1;
  89.    }
  90.    else{
  91.    	return 0;
  92.    }
  93. }
  94.  
  95. int isEmpty(void)
  96. {
  97.     if(sp<=0){
  98.     	return 1;
  99.     }
  100.     else{
  101.     	return 0;
  102.     }
  103. }
  104.  
  105. void answer(void)
  106. {
  107. 	if(!isEmpty()){
  108.         printf("data: %f\n", stack[sp - 1]);
  109. 	}
  110. 	else printf("スタックは空\n");
  111. }
  112.  
  113. void reset(void)
  114. {
  115.     sp = 0;
  116. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin 
5 1 5 2 1 9
stdout 
data: 3.000000
https://ideone.com/ZThF0B
language:
C99 (gcc 8.3)
created:
5 hours ago
visibility:
public

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