View Compilation Error

0_0_19929148_16490.cpp:15:9: error: stray '#' in program
   b>>=1;#include<cmath>
         ^
0_0_19929148_16490.cpp: In function 'long long int power_c(long long int, long long int, long long int)':
0_0_19929148_16490.cpp:15:10: error: 'include' was not declared in this scope
   b>>=1;#include<cmath>
          ^
0_0_19929148_16490.cpp:15:18: error: 'cmath' was not declared in this scope
   b>>=1;#include<cmath>
                  ^
0_0_19929148_16490.cpp:21:1: error: expected primary-expression before 'using'
 using namespace std;
 ^
0_0_19929148_16490.cpp:24:57: error: a function-definition is not allowed here before '{' token
 long long power_c(long long a,long long b,long long mod){
                                                         ^
0_0_19929148_16490.cpp:167:1: error: expected '}' at end of input
 } 
 ^
0_0_19929148_16490.cpp:167:1: error: expected '}' at end of input