View Compilation Error

0_0_24993093_22902.cpp: In function 'int main()':
0_0_24993093_22902.cpp:42:23: error: 'a' was not declared in this scope
  while(cin>>aa>>bb>>n,a||b||c)
                       ^
0_0_24993093_22902.cpp:42:26: error: 'b' was not declared in this scope
  while(cin>>aa>>bb>>n,a||b||c)
                          ^
0_0_24993093_22902.cpp:42:29: error: 'c' was not declared in this scope
  while(cin>>aa>>bb>>n,a||b||c)
                             ^