Precompiled headers

[DuduSh]

hi All,
i have some basic question.
here it goes:
1) what the purpose of precompiled header files (as Stdafx.cpp,stdafx.h).
2) what the impact of not using those precompiled files?

TIA

 

[David Wilkinson]

hi All,
i have some basic question.
here it goes:
1) what the purpose of precompiled header files (as Stdafx.cpp,stdafx.h).
2) what the impact of not using those precompiled files?

DuduSh:

1. Compile faster

2. Compile slower