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  1. %{
  2. #include <stdio.h>
  3. void hexToDecimal(char*);
  4. %}
  5.  
  6. %%
  7. [0-9A-Fa-f]+ {hexToDecimal(yytext);}
  8. %%
  9.  
  10. void hexToDecimal(char *yytext){
  11.     int value = 0;
  12.     int i = 0;
  13.  
  14.     while (yytext[i] != '\0') {
  15.         value = value * 16;
  16.         if (yytext[i] >= '0' && yytext[i] <= '9') {
  17.             value = value + (yytext[i] - '0');
  18.         } else if (yytext[i] >= 'A' && yytext[i] <= 'F') {
  19.             value = value + (yytext[i] - 'A' + 10);
  20.         } else if (yytext[i] >= 'a' && yytext[i] <= 'f') {
  21.             value = value + (yytext[i] - 'a' + 10);
  22.         }
  23.         i++;
  24.     }
  25.     printf("%d\n", value);
  26. }
  27.  
  28. int yywrap() {
  29.     return 1;
  30. }
  31.  
  32. int main() {
  33.     yylex();
  34.     return 0;
  35. }
Success #stdin #stdout #stderr 0.02s 6840KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/xzpAJ6/prog:35:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/jpIXdG
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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