View Compilation Error

0_0_16268769_26021.cpp: In function 'int main()':
0_0_16268769_26021.cpp:6:8: error: 'cin' was not declared in this scope
  while(cin>>n){
        ^
0_0_16268769_26021.cpp:11:36: error: 'swap' was not declared in this scope
    if(m[i]>m[i+1]) swap(m[i],m[i+1]);
                                    ^
0_0_16268769_26021.cpp:13:3: error: 'cout' was not declared in this scope
   cout<<m[n/2]<<endl; 
   ^
0_0_16268769_26021.cpp:13:17: error: 'endl' was not declared in this scope
   cout<<m[n/2]<<endl; 
                 ^