View Compilation Error

0_0_26058113_23318.cpp: In function 'int main()':
0_0_26058113_23318.cpp:11:37: error: 'setprecision' was not declared in this scope
         cout <<fixed<<setprecision(0)<<pow(2,n)<<endl;
                                     ^
0_0_26058113_23318.cpp:11:47: error: 'pow' was not declared in this scope
         cout <<fixed<<setprecision(0)<<pow(2,n)<<endl;
                                               ^