View Compilation Error

0_0_29776657_27154.cpp: In function 'void B_Forest()':
0_0_29776657_27154.cpp:646:14: error: expected primary-expression before '%' token
  if(book[4] =%
              ^
0_0_29776657_27154.cpp:646:14: error: expected primary-expression at end of input
0_0_29776657_27154.cpp:646:14: error: expected ')' at end of input
0_0_29776657_27154.cpp:646:14: error: expected statement at end of input
0_0_29776657_27154.cpp:646:14: error: expected '}' at end of input