View Compilation Error

0_0_32345379_20636.cpp: In function 'int main()':
0_0_32345379_20636.cpp:5:12: error: 'a' was not declared in this scope
 while(cin>>a>>b)cout<<a+b<<endl;
            ^
0_0_32345379_20636.cpp:5:15: error: 'b' was not declared in this scope
 while(cin>>a>>b)cout<<a+b<<endl;
               ^