/in/foo.c: In function 'main':
/in/foo.c:5:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'b'
     float a b
             ^
/in/foo.c:5:13: error: unknown type name 'b'
/in/foo.c:10:9: error: expected declaration specifiers or '...' before string constant
  printf("hello, world\n");
         ^~~~~~~~~~~~~~~~