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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. DIGIT       [0-9]+
  6.  
  7. %%
  8. {DIGIT}     { printf("Number "); }
  9. "+"         { printf("plus "); }
  10. "-"         { printf("minus "); }
  11. "*"         { printf("multiply "); }
  12. "/"         { printf("divide "); }
  13. [ \t\n]     { /* ignore whitespace */ }
  14. .           { printf("Unknown character\n"); }
  15.  
  16. %%
  17.  
  18. int main() {
  19.     yylex();
  20.     return 0;
  21. }
  22.  
  23. int yywrap() {
  24.     return 1;
  25. }
  26.  
Success #stdin #stdout #stderr 0.03s 6808KB
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stdin
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2+3
stdout
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Standard output is empty
stderr
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ERROR: /home/0h4pUm/prog:2:1: Syntax error: Operator expected
ERROR: /home/0h4pUm/prog:25:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/OaCgiE
language:
Prolog (swi 7.6.4)
created:
4 days ago
visibility:
public

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