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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. extern int yylex();
  6. int yyerror(const char *s);
  7. %}
  8.  
  9. %token NUMBER ID
  10. %left '+' '-'
  11. %left '%' '*' '/'
  12. %left '(' ')'
  13.  
  14. %%
  15. expr:
  16.       expr '+' expr   { printf("Addition\n"); }
  17.     | expr '-' expr   { printf("Subtraction\n"); }
  18.     | expr '*' expr   { printf("Multiplication\n"); }
  19.     | expr '/' expr   { printf("Division\n"); }
  20.     | expr '%' expr   { printf("Modulo\n"); }
  21.     | '-' NUMBER      { printf("Negative Number\n"); }
  22.     | '-' ID         { printf("Negative Identifier\n"); }
  23.     | '(' expr ')'   { /* Parentheses handling */ }
  24.     | NUMBER
  25.     | ID
  26.     ;
  27.  
  28. %%
  29.  
  30. // Main function
  31. int main() {
  32.     printf("Enter the expression:\n");
  33.     yyparse();
  34.     printf("\nExpression is valid\n");
  35.     return 0;
  36. }
  37.  
  38. // Error handling function
  39. int yyerror(const char *s) {
  40.     printf("\nExpression is invalid\n");
  41.     exit(1);
  42. }
Success #stdin #stdout #stderr 0.03s 6932KB
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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/fRcfNR/prog:42:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/XVDk93
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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