View Compilation Error

0_0_31172519_10507.cpp: In function 'int main()':
0_0_31172519_10507.cpp:4:11: error: 'cin' was not declared in this scope
     while(cin>>i>>j)
           ^
0_0_31172519_10507.cpp:12:13: error: 'cout' was not declared in this scope
             cout<<i+j<<endl;
             ^
0_0_31172519_10507.cpp:12:24: error: 'endl' was not declared in this scope
             cout<<i+j<<endl;
                        ^