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  1. %{ 
  2. #include <stdio.h> 
  3. #include <stdlib.h> 
  4. %} 
  5.  
  6. %token NUMBER 
  7. %left '+' '-' 
  8. %left '*' '/' 
  9. %left '(' ')' 
  10.  
  11. %% 
  12.  
  13. expr: 
  14.       expr '+' expr     | expr '-' expr 
  15.     | expr '*' expr 
  16.     | expr '/' expr 
  17.     | '(' expr ')' 
  18.     | NUMBER 
  19.     ; 
  20.  
  21. %% 
  22.  
  23. int main() {     printf("Enter an arithmetic expression:\n");     yyparse(); 
  24.     return 0; 
  25. } 
  26.  
  27. int yyerror(char *msg) {     printf("Syntax Error: %s\n", msg);     return 0; 
  28. } 
  29.  
Success #stdin #stdout #stderr 0.02s 7008KB
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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/k2Hk1E/prog:28:2: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/20yxBC
language:
Prolog (swi 7.6.4)
created:
7 days ago
visibility:
public

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