View Compilation Error

0_0_23651746_28884.cpp: In function 'int main()':
0_0_23651746_28884.cpp:5:1: error: 'cin' was not declared in this scope
 cin>>a>>b;
 ^
0_0_23651746_28884.cpp:6:1: error: 'cout' was not declared in this scope
 cout<<a+b;
 ^