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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. int ntoken=0;
  5. %}
  6. %%
  7. [ \t\n]+     ;
  8. [0-9]+(\.[0-9]+)?    { ntoken++; printf("NUMBER(%s) ", yytext); }
  9. [A-Za-z_][A-Za-z0-9_]*  { ntoken++; printf("IDENTIFIER(%s) ", yytext); }
  10. "+"|"-"|"*"|"/"|"="|"=="|"!="|"<"|">"|"<="|">="  { ntoken++; printf("OPERATOR(%s) ", yytext); }
  11. "("  { ntoken++; printf("LPAREN "); }
  12. ")"  { ntoken++; printf("RPAREN "); }
  13. "{"  { ntoken++; printf("LCURLY "); }
  14. "}"  { ntoken++; printf("RCURLY "); }
  15. ";"  { ntoken++; printf("SEMICOLON "); }
  16. ","  { ntoken++; printf("COMMA "); }
  17. .    { ntoken++; printf("UNKNOWN(%s) ", yytext); }
  18. %%
  19. int main()
  20. {
  21.     char input[1024];
  22.     printf("Enter input: ");
  23.     fgets(input, sizeof(input), stdin);
  24.     YY_BUFFER_STATE buffer = yy_scan_string(input);
  25.     yylex();
  26.     yy_delete_buffer(buffer);
  27.     printf("\nTotal number of tokens = %d\n", ntoken);
  28.     return 0;
  29. }
  30.  
  31.  
Success #stdin #stdout #stderr 0.03s 6800KB
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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/oWGN22/prog:2:1: Syntax error: Operator expected
ERROR: /home/oWGN22/prog:30:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/G8HHvU
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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