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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. int yylex(void);
  6. void yyerror(const char *s);
  7. %}
  8.  
  9. %token NUM
  10. %left '+' '-'
  11. %left '*' '/'
  12.  
  13. %%
  14.  
  15. expr:
  16.       expr '+' expr  { printf("%d\n", $1 + $3); }
  17.     | expr '-' expr  { printf("%d\n", $1 - $3); }
  18.     | expr '*' expr  { printf("%d\n", $1 * $3); }
  19.     | expr '/' expr  { 
  20.                         if ($3 == 0) {
  21.                             yyerror("Division by zero!");
  22.                         } else {
  23.                             printf("%d\n", $1 / $3);
  24.                         }
  25.                       }
  26.     | '(' expr ')'    { $$ = $2; }
  27.     | NUM             { $$ = $1; }
  28.     ;
  29.  
  30. %%
  31.  
  32. void yyerror(const char *s) {
  33.     fprintf(stderr, "Error: %s\n", s);
  34. }
  35.  
  36. int main() {
  37.     printf("Enter an arithmetic expression:\n");
  38.     yyparse();
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout #stderr 0.02s 6964KB
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stdin
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Hello World
stdout
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Standard output is empty
stderr
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ERROR: /home/f5MCrA/prog:40:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/PGyejy
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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