View Compilation Error

0_0_30484951_30529.cpp: In function 'int main()':
0_0_30484951_30529.cpp:8:8: error: 'cin' was not declared in this scope
  while(cin>>m){
        ^
0_0_30484951_30529.cpp:29:3: error: 'cout' was not declared in this scope
   cout<<score[k]<<endl;
   ^
0_0_30484951_30529.cpp:29:19: error: 'endl' was not declared in this scope
   cout<<score[k]<<endl;
                   ^
0_0_30484951_30529.cpp:32:2: error: 'cout' was not declared in this scope
  cout<<fixed<<setprecision(2)<<(sum-max-min)/(m-2)<<endl;
  ^
0_0_30484951_30529.cpp:32:53: error: 'endl' was not declared in this scope
  cout<<fixed<<setprecision(2)<<(sum-max-min)/(m-2)<<endl;
                                                     ^