View Compilation Error

0_0_19418715_1186.cpp: In function 'int main()':
0_0_19418715_1186.cpp:30:12: error: 'cin' was not declared in this scope
     while (cin>>n && n != 0)
            ^
0_0_19418715_1186.cpp:49:9: error: 'cout' was not declared in this scope
         cout<<count_ - 1<<endl;
         ^
0_0_19418715_1186.cpp:49:27: error: 'endl' was not declared in this scope
         cout<<count_ - 1<<endl;
                           ^