View Compilation Error

0_0_35758558_4492.cpp: In function 'int main()':
0_0_35758558_4492.cpp:5:11: error: 'cin' was not declared in this scope
     while(cin>>n>>p){
           ^
0_0_35758558_4492.cpp:8:29: error: 'pow' was not declared in this scope
         double now=pow(p,n+1);
                             ^
0_0_35758558_4492.cpp:21:41: error: 'printf' was not declared in this scope
         printf("Case %d: %.6lf\n",cn,ans);
                                         ^