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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. "+"            { printf("Arithmetic Operator: +\n"); }
  7. "-"            { printf("Arithmetic Operator: -\n"); }
  8. "*"            { printf("Arithmetic Operator: *\n"); }
  9. "/"            { printf("Arithmetic Operator: /\n"); }
  10.  
  11. "="            { printf("Assignment Operator: =\n"); }
  12. "+="           { printf("Assignment Operator: +=\n"); }
  13. "-="           { printf("Assignment Operator: -=\n"); }
  14. "*="           { printf("Assignment Operator: *=\n"); }
  15. "/="           { printf("Assignment Operator: /=\n"); }
  16. "%="           { printf("Assignment Operator: %=\n"); }
  17.  
  18. "&"            { printf("Bitwise Operator: &\n"); }
  19. "|"            { printf("Bitwise Operator: |\n"); }
  20. "^"            { printf("Bitwise Operator: ^\n"); }
  21. "~"            { printf("Bitwise Operator: ~\n"); }
  22.  
  23. "=="           { printf("Relational Operator: ==\n"); }
  24. "!="           { printf("Relational Operator: !=\n"); }
  25. ">"            { printf("Relational Operator: >\n"); }
  26. "<"            { printf("Relational Operator: <\n"); }
  27. ">="           { printf("Relational Operator: >=\n"); }
  28. "<="           { printf("Relational Operator: <=\n"); }
  29.  
  30. "<<"           { printf("Shift Operator: <<\n"); }
  31. ">>"           { printf("Shift Operator: >>\n"); }
  32.  
  33. "&&"           { printf("Logical Operator: &&\n"); }
  34. "||"           { printf("Logical Operator: ||\n"); }
  35. "!"            { printf("Logical Operator: !\n"); }
  36.  
  37. [ \t\n]        { /* Ignore whitespace */ }
  38. .              { printf("Other Symbol: %s\n", yytext); }
  39. %%
  40.  
  41. int main() {
  42.     printf("Enter the operators: \n");
  43.     yylex();
  44.     return 0;
  45. }
  46.  
Success #stdin #stdout #stderr 0.02s 6884KB
comments (?)
stdin
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flex operators.l
gcc lex.yy.c -lfl
./a.out
stdout
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Standard output is empty
stderr
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ERROR: /home/PgNTPi/prog:2:1: Syntax error: Operator expected
ERROR: /home/PgNTPi/prog:45:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ?       [3] program
   Exception: (3) program ? ERROR: No previous search
   Exception: (3) program ? EOF: exit
https://ideone.com/4hRVeO
language:
Prolog (swi 7.6.4)
created:
13 hours ago
visibility:
public

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