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  1. #include <stdio.h>
  2.  
  3. int
  4. main(void)
  5. {
  6. if (!stdin || (stdin = 0, main()))
  7. printf("hello");
  8. else
  9. printf("world");
  10. return 0;
  11. }
  12.  
Success #stdin #stdout 0.01s 1720KB
stdin
Standard input is empty
stdout
helloworld