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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. %}
  5.  
  6. %%
  7. "int"        { printf("Keyword: int\n"); }
  8. "float"      { printf("Keyword: float\n"); }
  9. "if"         { printf("Keyword: if\n"); }
  10. "else"       { printf("Keyword: else\n"); }
  11. [a-zA-Z_][a-zA-Z0-9_]*   { printf("Identifier: %s\n", yytext); }
  12. [0-9]+       { printf("Number: %s\n", yytext); }
  13. "+"          { printf("Operator: +\n"); }
  14. "-"          { printf("Operator: -\n"); }
  15. "*"          { printf("Operator: *\n"); }
  16. "/"          { printf("Operator: /\n"); }
  17. "="          { printf("Operator: =\n"); }
  18. ";"          { printf("Delimiter: ;\n"); }
  19. "\n"         { /* Ignore newlines */ }
  20. [ \t\r]      { /* Ignore whitespace */ }
  21. .            { printf("Unknown: %s\n", yytext); }
  22. %%
  23.  
  24. int main() {
  25.     yylex(); // Invoke the lexical analyzer
  26.     return 0;
  27. }
  28.  
  29.  
Success #stdin #stdout #stderr 0.02s 6944KB
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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/IDuVy7/prog:2:1: Syntax error: Operator expected
ERROR: /home/IDuVy7/prog:28:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/idSJl9
language:
Prolog (swi 7.6.4)
created:
19 days ago
visibility:
public

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