View Compilation Error

0_0_19115150_16568.cpp: In function 'LL read()':
0_0_19115150_16568.cpp:12:32: error: '_IO_stdin' was not declared in this scope
     char ch=_IO_getc_unlocked (_IO_stdin);
                                ^
0_0_19115150_16568.cpp:12:41: error: '_IO_getc_unlocked' was not declared in this scope
     char ch=_IO_getc_unlocked (_IO_stdin);
                                         ^