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  1. %{
  2. #include<stdio.h>
  3. %}
  4.  
  5. %%
  6. [-+*/()] { 
  7.     printf("Entered character is an operator\n"); 
  8. }
  9. . { 
  10.     printf("Entered character is not an operator\n"); 
  11. }
  12. %%
  13.  
  14. int main()
  15. {
  16.     char a;
  17.     printf("Enter a character- ");
  18.     scanf("%c",&a);
  19.     yy_scan_string(&a);
  20.     yylex();
  21.     return 0;
  22. }
Success #stdin #stdout #stderr 0.02s 6920KB
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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/uu2t1X/prog:2:1: Syntax error: Operator expected
ERROR: /home/uu2t1X/prog:22:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/r0xZYd
language:
Prolog (swi 7.6.4)
created:
1 year ago
visibility:
public

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