View Compilation Error

0_0_26299583_5585.cpp: In function 'int main()':
0_0_26299583_5585.cpp:6:10: error: 'cin' was not declared in this scope
    while(cin>>n)
          ^
0_0_26299583_5585.cpp:23:29: error: 'printf' was not declared in this scope
      printf("%.2lf",a[t]*100);
                             ^
0_0_26299583_5585.cpp:24:7: error: 'cout' was not declared in this scope
       cout<<"%"<<endl;
       ^
0_0_26299583_5585.cpp:24:18: error: 'endl' was not declared in this scope
       cout<<"%"<<endl;
                  ^