View Compilation Error

0_0_15051773_22823.cpp:15:13: error: 'LL' was not declared in this scope
  int modexp(LL x, int b,int C)
             ^
0_0_15051773_22823.cpp:15:19: error: expected primary-expression before 'int'
  int modexp(LL x, int b,int C)
                   ^
0_0_15051773_22823.cpp:15:25: error: expected primary-expression before 'int'
  int modexp(LL x, int b,int C)
                         ^
0_0_15051773_22823.cpp:15:30: error: expression list treated as compound expression in initializer [-fpermissive]
  int modexp(LL x, int b,int C)
                              ^
0_0_15051773_22823.cpp:16:1: error: expected ',' or ';' before '{' token
 {
 ^