View Compilation Error

0_0_18919001_205.cpp:2:12: error: 'std::cin' has not been declared
 using std::cin;
            ^
0_0_18919001_205.cpp:3:12: error: 'std::cout' has not been declared
 using std::cout;
            ^
0_0_18919001_205.cpp:4:12: error: 'std::endl' has not been declared
 using std::endl;
            ^
0_0_18919001_205.cpp: In function 'int main()':
0_0_18919001_205.cpp:9:12: error: 'cin' was not declared in this scope
     while (cin >> integer1 >> integer2) {
            ^
0_0_18919001_205.cpp:10:9: error: 'cout' was not declared in this scope
         cout << integer1 + integer2 << endl;
         ^
0_0_18919001_205.cpp:10:40: error: 'endl' was not declared in this scope
         cout << integer1 + integer2 << endl;
                                        ^