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  1. %{
  2.     #include <stdio.h>
  3.     #include <stdlib.h>
  4. %}
  5.  
  6. %option noyywrap
  7.  
  8. %%
  9. "int"     { printf("Keyword: int\n"); }
  10. "float"   { printf("Keyword: float\n"); }
  11. "if"      { printf("Keyword: if\n"); }
  12. "else"    { printf("Keyword: else\n"); }
  13.  
  14. [0-9]+\.[0-9]+  { printf("Float: %s\n", yytext); }
  15. [0-9]+          { printf("Integer: %s\n", yytext); }
  16. [a-zA-Z_][a-zA-Z0-9_]*  { printf("Identifier: %s\n", yytext); }
  17.  
  18. "+"     { printf("Operator: +\n"); }
  19. "-"     { printf("Operator: -\n"); }
  20. "*"     { printf("Operator: *\n"); }
  21. "/"     { printf("Operator: /\n"); }
  22. "="     { printf("Assignment Operator: =\n"); }
  23. ";"     { printf("Semicolon: ;\n"); }
  24. ","     { printf("Comma: ,\n"); }
  25.  
  26. [\t\n ]+    { /* Ignore whitespace */ }
  27. .           { printf("Unknown Character: %s\n", yytext); }
  28.  
  29. %%
  30.  
  31. int main() {
  32.     printf("Enter code to analyze:\n");
  33.     yylex();
  34.     return 0;
  35. }
  36.  
Success #stdin #stdout #stderr 0.03s 6820KB
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stdin
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*
stdout
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Standard output is empty
stderr
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ERROR: /home/j07qpv/prog:2:5: Syntax error: Operator expected
ERROR: /home/j07qpv/prog:35:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? EOF: exit
https://ideone.com/rNxdL6
language:
Prolog (swi 7.6.4)
created:
18 hours ago
visibility:
public

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