View Compilation Error

0_0_15114602_7738.cpp: In function 'int main(int, char**)':
0_0_15114602_7738.cpp:12:11: error: 'E' was not declared in this scope
     cout<<E<<endl;
           ^
0_0_15114602_7738.cpp:16:11: error: 'D' was not declared in this scope
     cout<<D<<endl;
           ^
0_0_15114602_7738.cpp:20:11: error: 'C' was not declared in this scope
     cout<<C<<endl; 
           ^
0_0_15114602_7738.cpp:24:11: error: 'B' was not declared in this scope
     cout<<B<<endl;
           ^
0_0_15114602_7738.cpp:28:11: error: 'A' was not declared in this scope
     cout<<A<<endl;
           ^