View Compilation Error

0_0_27836678_1524.cpp: In function 'int main()':
0_0_27836678_1524.cpp:5:3: error: 'cin' was not declared in this scope
   cin>>a>>b;
   ^
0_0_27836678_1524.cpp:6:3: error: 'cout' was not declared in this scope
   cout<<a+b;
   ^