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  1. %{
  2. 	#include<stdio.h>
  3. 	#include<string.h>
  4. 	#include<ctype.h>
  5.  
  6. %}
  7.  
  8. %%
  9.  
  10. [a-z,A-Z].[(\."-")]{printf("by using top down parsing the given string:%s,is satisfying the grammar",yytext)}
  11.  
  12. else if {printf("by using top down parsing the given string:%s is not satisfying the grammar",yytext)}
  13.  
  14. %%
  15.  
  16. int main(){
  17. 	printf("enter the string:");
  18. 	scanf('%s\n',&string);
  19. 	yylex();
  20. 	return 0;
  21. }
  22.  
  23. yywrap(){
  24. 	return 1;
  25. }
Success #stdin #stdout #stderr 0.02s 6856KB
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stdin
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expression:  a + b - c * 3.4
stdout
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Standard output is empty
stderr
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ERROR: /home/HHfU0W/prog:25:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/U5fEYN
language:
Prolog (swi 7.6.4)
created:
8 days ago
visibility:
public

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