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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. int cnt[256] = {0};
  14.  
  15. // process
  16. int main()
  17. {
  18.   FILE *fp;
  19.   int i;
  20.   char buffer[1024];
  21.   char *str;
  22.  
  23.   fp = fopen("c161-102.c.in", "r");
  24.   while (str = fgets(buffer, sizeof(buffer), fp)) {
  25.     printf("input  = %s", str);
  26.     res(str);
  27. 	printf("result = %d\n", pop());
  28.   }
  29.   for ( i = 0; i < 256; ++i)
  30.     if (cnt[i])
  31.       printf("%c %d\n", i, cnt[i]);
  32.  
  33.   return 0;
  34. }
  35.  
  36.  
  37. void res(char *str)
  38. {
  39.   int a, b, i;
  40.  
  41.   for (i = 0;str[i] != '\0';i++){
  42.       switch (str[i]) {
  43.           case '+':
  44.               a=pop();
  45.               b=pop();
  46.               push(b+a);
  47.               break;
  48.           case '-':
  49.               a=pop();
  50.               b=pop();
  51.               push(b-a);
  52.               break;
  53.           case '*':
  54.               a=pop();
  55.               b=pop();
  56.               push(b*a);
  57.               break;
  58.           case '/':
  59.               a=pop();
  60.               b=pop();
  61.               if (a==0)
  62.                   break;
  63.               push(b/a);
  64.               break;
  65.           case ' ':
  66.           case '\n':
  67. 			  break;
  68.           default:
  69.               push((int)str[i]-'0');
  70.       }
  71.   }
  72. }
  73.  
  74. void push(int w)
  75. {
  76.   st[pt++] = w;
  77. }
  78.  
  79. int pop()
  80. {
  81.   return st[--pt];
  82. }
  83.  
Runtime error #stdin #stdout 0.02s 1848KB
comments (?)
stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/QMCbNa
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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