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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #define STACK_MAX (100)
  4.  
  5. // prototype
  6. void res();
  7. void push(int w);
  8. int pop();
  9.  
  10. // global
  11. int st[STACK_MAX];
  12. int pt = 0;
  13. char str[10];
  14. int cnt[256] = {};
  15.  
  16. // process
  17. int main()
  18. {
  19.   FILE *fp;
  20.   int i;
  21.  
  22.   fp = fopen("c161-102.c.in", "r");
  23.   printf("input = ");
  24.   while ((fscanf(fp, "%s", str)) != EOF)
  25.     res();
  26.   printf("\nresult = %d\n", pop());
  27.   for ( i = 0; i < 256; ++i)
  28.     if (cnt[i])
  29.       printf("%c %d\n", i, cnt[i]);
  30.  
  31.   return 0;
  32. }
  33.  
  34.  
  35. void res()
  36. {
  37.   int a, b;
  38.   char c;
  39.  
  40.   printf("%s ", str);
  41.   c = str[0];
  42.  
  43.   switch (c) {
  44.   case '+':
  45.     cnt[c]++;
  46.     a = pop();
  47.     b = pop();
  48.     push(b + a);
  49.     break;
  50.   case '-':
  51.     cnt[c]++;
  52.     a = pop();
  53.     b = pop();
  54.     push(b - a);
  55.     break;
  56.   case '*':
  57.     cnt[c]++;
  58.     a = pop();
  59.     b = pop();
  60.     push(b * a);
  61.     break;
  62.   case '/':
  63.     cnt[c]++;
  64.     a = pop();
  65.     b = pop();
  66.     if (a == 0)
  67.       break;
  68.     push(b / a);
  69.     break;
  70.   default:
  71.     push(atoi(str ));
  72.     break;
  73.   }
  74. }
  75.  
  76. void push(int w)
  77. {
  78.   st[pt++] = w;
  79. }
  80.  
  81. int pop()
  82. {
  83.   return st[--pt];
  84. }
  85.  
Runtime error #stdin #stdout 0.02s 1808KB
comments (?)
stdin 
1 2 + 3 4 * +
11 22 - 3 /
+
stdout 
Standard output is empty
https://ideone.com/hl4N8b
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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