View Compilation Error

0_0_30109902_15516.cpp: In function 'char fastIO::nc()':
0_0_30109902_15516.cpp:21:19: error: 'B' was not declared in this scope
   static char buf[B
                   ^
0_0_30109902_15516.cpp:21:19: error: expected ']' at end of input
0_0_30109902_15516.cpp:21:19: error: expected '}' at end of input
0_0_30109902_15516.cpp: At global scope:
0_0_30109902_15516.cpp:21:19: error: expected '}' at end of input