View Compilation Error

0_0_30132950_4214.cpp: In function 'int main()':
0_0_30132950_4214.cpp:135:5: error: 'cin' was not declared in this scope
     cin>>a>>b;
     ^
0_0_30132950_4214.cpp:136:5: error: 'cout' was not declared in this scope
     cout<<a+b<<endl;
     ^
0_0_30132950_4214.cpp:136:16: error: 'endl' was not declared in this scope
     cout<<a+b<<endl;
                ^