View Compilation Error

0_0_16995244_12063.cpp: In function 'int main()':
0_0_16995244_12063.cpp:8:8: error: 'cin' was not declared in this scope
  while(cin >> a >> b >> n) {
        ^
0_0_16995244_12063.cpp:9:22: error: 'c' was not declared in this scope
   if(a==0 && b==0 && c==0)
                      ^
0_0_16995244_12063.cpp:13:4: error: 'cout' was not declared in this scope
    cout << 1 << endl;
    ^
0_0_16995244_12063.cpp:13:17: error: 'endl' was not declared in this scope
    cout << 1 << endl;
                 ^
0_0_16995244_12063.cpp:23:3: error: 'cout' was not declared in this scope
   cout << f3 << endl;
   ^
0_0_16995244_12063.cpp:23:17: error: 'endl' was not declared in this scope
   cout << f3 << endl;
                 ^