Order of including libraries and using namespace in c++

#1

is there any order which we should follow in including libraries and using namespace std.if yes why?if not why?

#2

@Rj.25
hello Reechika,

I think order will not matter because compiler will replace all preprocessor directive with their declaration( not definition) .

example if ->
#include < sum>
#include < sub>
then preprocess replace them with
int sum(int a,int b); // declaration)
int sub(int a,int b) ; // declaration

order between them will not matter.

using namespace std; (u need to know about namespaces first)
here we are just saying that we want to use namespace std where cin and cout is present inside iostream file / library

#3

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