Getting multiple errors about the headerfile and istream and ostream

#1

i think my logic is wrong as im getting these many errors,heres tha code

#2

cin>>n1>>endl;
this is wrong statement

correct one is cin>>n1;

when you use cout then this should be correct
cout<<N1<<endl;

Modified Code

#3

the code you sent is not of this question , pls check

#4

okay sorry
Modified Code

#5

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