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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. %}
  5.  
  6. /* Definitions (Regex for tokens) */
  7. DIGIT   [0-9]
  8. ID      [a-zA-Z_][a-zA-Z0-9_]*
  9. WS      [ \t\n]+
  10.  
  11. %%
  12. "if"                { printf("KEYWORD : %s\n", yytext); }
  13. "else"              { printf("KEYWORD : %s\n", yytext); }
  14. "while"             { printf("KEYWORD : %s\n", yytext); }
  15. "int"|"float"|"char" { printf("DATATYPE : %s\n", yytext); }
  16.  
  17. {ID}                { printf("IDENTIFIER : %s\n", yytext); }
  18. {DIGIT}+            { printf("NUMBER : %s\n", yytext); }
  19. "=="|"="            { printf("ASSIGN/COMPARE OPERATOR : %s\n", yytext); }
  20. "+"|"-"|"*"|"/"     { printf("ARITHMETIC OPERATOR : %s\n", yytext); }
  21. ";"                 { printf("SEMICOLON\n"); }
  22. {WS}                { /* Ignore whitespace */ }
  23. .                   { printf("UNKNOWN : %s\n", yytext); }
  24. %%
  25.  
  26. int main() {
  27.     printf("Enter the input:\n");
  28.     yylex();
  29.     return 0;
  30. }
  31.  
  32. int yywrap() {
  33.     return 1;
  34. }
  35.  
Success #stdin #stdout #stderr 0.04s 6864KB
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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/HnrbKp/prog:2:1: Syntax error: Operator expected
ERROR: /home/HnrbKp/prog:34:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/KscMXZ
language:
Prolog (swi 7.6.4)
created:
8 days ago
visibility:
public

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