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  1. %option noyywrap
  2. %{
  3.   #include <stdio.h>
  4. %}
  5.  
  6. %%
  7.  
  8. "int"|"float"|"return"|"if"|"else"|"while"|"for"|"do"|"switch"|"case" { 
  9.   printf("Keyword: %s\n", yytext); 
  10. }
  11.  
  12. . ;  // Ignore other characters
  13.  
  14. %%
  15.  
  16. int main() {
  17.   printf("Enter some expression: \n");
  18.   yylex();
  19.   return 0;
  20. }
  21.  
Success #stdin #stdout #stderr 0.03s 6868KB
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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/yInfBE/prog:3:3: Syntax error: Operator expected
ERROR: /home/yInfBE/prog:20:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/N9OBUh
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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