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  1. %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. %}
  5.  
  6. %token NUM
  7.  
  8. %%
  9.  
  10. [0-9]+        { yylval = atoi(yytext); return NUM; }
  11.  
  12. "+"           { return '+'; }
  13. "-"           { return '-'; }
  14. "*"           { return '*'; }
  15. "/"           { return '/'; }
  16. "\n"          { return 0; }  // end of expression
  17.  
  18. [ \t]          { /* Ignore whitespace */ }
  19.  
  20. %%
  21.  
  22. int main(void) {
  23.     int token;
  24.     while ((token = yylex()) != 0) {
  25.         switch (token) {
  26.             case NUM:
  27.                 printf("Number: %d\n", yylval);
  28.                 break;
  29.             case '+':
  30.                 printf("Addition\n");
  31.                 break;
  32.             case '-':
  33.                 printf("Subtraction\n");
  34.                 break;
  35.             case '*':
  36.                 printf("Multiplication\n");
  37.                 break;
  38.             case '/':
  39.                 printf("Division\n");
  40.                 break;
  41.             default:
  42.                 printf("Unknown token\n");
  43.                 break;
  44.         }
  45.     }
  46.     return 0;
  47. }
  48.  
Success #stdin #stdout #stderr 0.03s 7020KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/nD94Bu/prog:47:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/OhLd68
language:
Prolog (swi 7.6.4)
created:
12 days ago
visibility:
public

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