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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. [0-9]+      { printf("Number: %s\n", yytext); }
  7. [+\-*/]     { printf("Operator: %s\n", yytext); }
  8. [\t\n]     { /* Ignore whitespace */ }
  9. .           { printf("Invalid character: %s\n", yytext); }
  10. %%
  11.  
  12. int main() {
  13.     printf("Enter a mathematical expression: ");
  14.     yylex();
  15.     return 0;
  16. }
Success #stdin #stdout #stderr 0.02s 6880KB
comments ()
stdin
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a+b*d-2
stdout
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Standard output is empty
stderr
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ERROR: /home/3xAZlV/prog:2:1: Syntax error: Operator expected
ERROR: /home/3xAZlV/prog:16:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/4UUJMq
language:
Prolog (swi 7.6.4)
created:
4 days ago
visibility:
public

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