Yêu cầu gì vậy em?

uses crt;

var a:array[1..300]of integer;

i,n,t,tb:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

t:=0;

for i:=1 to n do 

  if i mod 2=1 then t:=t+a[i];

tb:=0;

for i:=1 to n do 

  tb:=tb+a[i];

writeln('Tong cac phan tu cua day o vi tri le la: ',t);

writeln('Trung binh cong cua day la: ',tb/n:4:2);

readln;

end.

Bài 1: 

uses crt;

var a:array[1..100]of integer;

i,n:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

for i:=1 to n do 

  if a[i] mod 2<>0 then write(a[i]:4);

readln;

end.

Bài 2: 

uses crt;

var a:array[1..100]of integer;

i,n:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

for i:=1 to n do

  if a[i] mod 2=0 then write(a[i]:4);

readln;

end.

Bài 3: 

uses crt;

var a:array[1..100]of integer;

i,n,t:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

t:=0;

for i:=1 to n do 

  if a[i] mod 2<>0 then t:=t+a[i];

writeln(t);

readln;

end.

uses crt;

var a:array[1..100]of integer;

i,n:integer;

begin

clrscr;

randomize;

write('Nhap n='); readln(n);

for i:=1 to n do 

a[i]:=random(100);

for i:=1 to n do 

 write(a[i]:4);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

long long a[1000],n,i;

int main()

{

freopen("dayd.inp","r",stdin);

freopen("dayd.out","w",stdout);

cin>>n;

for (i=1; i<=n; i++) cin>>a[i];

for (i=1; i<=n; i++)

if (a[i]>0) cout<<a[i]<<" ";

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long a[10000],i,n,t;

int main()

{

freopen("avg.inp","r",stdin);

freopen("avg.out","w",stdout);

cin>>n;

for (i=1; i<=n; i++) cin>>a[i];

t=0;

for (i=1; i<=n; i++) t+=a[i];

cout<<fixed<<setprecision(1)<<(t*1.0)/(n*1.0);

return 0;

}

const fi='chuso.inp'      fo='chuso.out'var f1,f2:text;    i,n:integer;    a:array[1..100] of integer;//chuongtrinhconfunction dai(x:integer)var st:string;    d:integer;beginstr(x,st);d:=length(st);dai:=d;end;//chuongtrinhconfunction tong(x:integer)var i,n,d,t,y:integer;    st:string;begin   str(x,st);   d:=length(st);   t:=0;   for i:=1 to d do    begin    val(st[i],n,y);    t:=t+n;    end;   tong:=t;end;//chuongtrinhchinhbeginassign(f1,fi); reset(f1);assign(f2,fo); rewrite(f2);readln(f1,n);for i:=1 to n do  read(f1,a[i]);for i:=1 to n do      writeln(f2,dai(a[i]),' ',tong(a[i]));    close(f1);    close(f2);end.