View Compilation Error

0_0_30940297_16996.cpp: In function 'void Rotate(int)':
0_0_30940297_16996.cpp:20:9: error: expected primary-expression at end of input
  int f=F%
         ^
0_0_30940297_16996.cpp:20:9: error: expected ',' or ';' at end of input
0_0_30940297_16996.cpp:20:9: error: expected '}' at end of input