View Compilation Error

0_0_32934119_32555.cpp: In function 'int main()':
0_0_32934119_32555.cpp:24:9: error: 'cin' was not declared in this scope
   while(cin>>y>>x,y!=0)
         ^
0_0_32934119_32555.cpp:43:3: error: 'cout' was not declared in this scope
   cout<<total<<endl;
   ^
0_0_32934119_32555.cpp:43:16: error: 'endl' was not declared in this scope
   cout<<total<<endl;
                ^