Run id: 95571

Main.cc: In function 'int main()':
Main.cc:6:16: error: 'c' was not declared in this scope
     cin>>a>>b>>c>>d;
                ^
Main.cc:6:19: error: 'd' was not declared in this scope
     cin>>a>>b>>c>>d;
                   ^
Main.cc:7:11: error: 'ab' was not declared in this scope
     cout<