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  1. %{
  2. #include <stdio.h>
  3. #include <ctype.h>
  4. %}
  5.  
  6. %%
  7. [a-z]     { printf("%c", toupper(yytext[0])); }
  8. [A-Z]     { printf("%c", tolower(yytext[0])); }
  9. .         { printf("%c", yytext[0]); }
  10. %%
  11.  
  12. int main() {
  13.     printf("Enter text: ");
  14.     yylex();
  15.     return 0;
  16. }
  17.  
  18. int yywrap() {
  19.     return 1;
  20. }
Success #stdin #stdout #stderr 0.02s 6940KB
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stdin
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HeLLo
stdout
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Standard output is empty
stderr
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ERROR: /home/dNJQ39/prog:2:1: Syntax error: Operator expected
ERROR: /home/dNJQ39/prog:20:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/E7Bz0e
language:
Prolog (swi 7.6.4)
created:
11 days ago
visibility:
public

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