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View Compilation Error

0_0_27575088_802.cpp: In function 'int main()':
0_0_27575088_802.cpp:5:8: error: 'cin' was not declared in this scope
  while(cin>>a>>b)
        ^
0_0_27575088_802.cpp:6:3: error: 'cout' was not declared in this scope
   cout<<a+b<<endl;
   ^
0_0_27575088_802.cpp:6:14: error: 'endl' was not declared in this scope
   cout<<a+b<<endl;
              ^


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