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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. "int"|"float"|"char"|"return" { printf("Keyword: %s\n", yytext); }
  7. [a-zA-Z_][a-zA-Z0-9_]* { printf("Identifier: %s\n", yytext); }
  8. [0-9]+ { printf("Number: %s\n", yytext); }
  9. .|\n ;
  10. %%
  11.  
  12. int main() {
  13. yylex();
  14. return 0;
  15. }
  16.  
Success #stdin #stdout #stderr 0.03s 6868KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
ERROR: /home/3w7uyd/prog:15:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit