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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. "+"     { printf("Operator: Addition\n"); }
  7. "-"     { printf("Operator: Subtraction\n"); }
  8. "*"     { printf("Operator: Multiplication\n"); }
  9. "/"     { printf("Operator: Division\n"); }
  10. "%"     { printf("Operator: Modulus\n"); }
  11. "="     { printf("Operator: Assignment\n"); }
  12. "=="    { printf("Operator: Equality\n"); }
  13. "!="    { printf("Operator: Not Equal\n"); }
  14. "<"     { printf("Operator: Less Than\n"); }
  15. "<="    { printf("Operator: Less Than or Equal\n"); }
  16. ">"     { printf("Operator: Greater Than\n"); }
  17. ">="    { printf("Operator: Greater Than or Equal\n"); }
  18. "&&"    { printf("Operator: Logical AND\n"); }
  19. "||"    { printf("Operator: Logical OR\n"); }
  20. "!"     { printf("Operator: Logical NOT\n"); }
  21. .       { printf("Unknown symbol: %s\n", yytext); }
  22. \n      { /* Ignore newline */ }
  23. %%
  24.  
  25. int main() {
  26.     printf("Enter an operator: ");
  27.     yylex();
  28.     return 0;
  29. }
  30.  
  31. int yywrap() {
  32.     return 1;
  33. }
  34.  
Success #stdin #stdout #stderr 0.02s 6900KB
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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/adfBUF/prog:2:1: Syntax error: Operator expected
ERROR: /home/adfBUF/prog:33:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/1ly3z1
language:
Prolog (swi 7.6.4)
created:
3 days ago
visibility:
public

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