View Compilation Error

0_0_28497441_13117.cpp:17:2: error: stray '#' in program
  
  ^
0_0_28497441_13117.cpp: In function 'int main()':
0_0_28497441_13117.cpp:9:3: error: 'cin' was not declared in this scope
   cin>>t;
   ^
0_0_28497441_13117.cpp:14:5: error: 'cout' was not declared in this scope
     cout<<fixed<<setprecision(0)<<pow(3,n)<<endl;
     ^
0_0_28497441_13117.cpp:14:45: error: 'endl' was not declared in this scope
     cout<<fixed<<setprecision(0)<<pow(3,n)<<endl;
                                             ^
0_0_28497441_13117.cpp: At global scope:
0_0_28497441_13117.cpp:17:3: error: expected unqualified-id before numeric constant
  
   ^
0_0_28497441_13117.cpp:17:3: error: expected constructor, destructor, or type conversion before numeric constant