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  1. %{
  2.  	#include<stdio.h>
  3.  	int a = 0, b = 0;
  4.  	void calc();
  5. %}
  6. %%
  7. [ \s\n\t]* {}
  8. [0-9]* {if(a) b = atoi(yytext);
  9. 	else a = atoi(yytext);}
  10. "+" {printf("%d + %d = %d\n",a,b,a+b);a=0;b=0;}
  11. "-" {printf("%d - %d = %d\n",a,b,a-b);a=0;b=0;}
  12. "*" {printf("%d * %d = %d\n",a,b,a*b);a=0;b=0;}
  13. "/" {if(b) printf("%d / %d = %d\n",a,b,a/b); else printf("INVALID\n");a=0;b=0;}
  14. "%" {if(b) printf("%d % %d = %d\n",a,b,a%b); else printf("INVALID\n");a=0;b=0;}
  15. %%
  16. int yywrap(){
  17. 	return 1;
  18. }
  19. int main(){
  20. 	yylex();
  21. 	fclose(yyin);
  22. }
  23.  
Success #stdin #stdout #stderr 0.03s 6904KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/ZVT2yH/prog:22:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/MeAP8h
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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