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  1. #include <windows.h>
  2.  
  3. int
  4. main (void)
  5. {
  6. MessageBox (0, "Hello, World!",
  7. "Message", MB_OK);
  8. return 0;
  9. }
Compilation error #stdin compilation error #stdout 0s 0KB
stdin
Standard input is empty
compilation info
prog.c:1:1: error: stray '##' in program
 ##include <windows.h>
 ^
prog.c:1:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
 ##include <windows.h>
           ^
stdout
Standard output is empty