Program HOC24;

var i,n: integer;

s: real;

begin

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

i:=1;

while i<=n do

begin

s:=s+1/sqr(i);

i:=i+1;

end;

write('S= ',s:8:2);

readln

end.

#include <bits/stdc++.h>

using namespace std;

int main()

{

int n,t=0;

cin>>n;

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

if (i%6==0) t+=i;

cout<<t;

return 0;

}

program Le_Nho_Hon_Hoac_Bang_n;

uses crt;

var

       n, i: integer;

begin

       clrscr;

       write('Nhap vao mot so nguyen duong n: ');

       readln(n);

       while n <= 0 do

       begin

              writeln('So ban nhap khong hop le. Xin vui long nhap lai: ');

              readln(n);

       end;

       clrscr;

       writeln('Cac so le nho hon hoac bang ', n, ' la:');

       i := 1;

       while i <= n do

       begin

              if i mod 2 <> 0 then

                     writeln(i);

              i := i + 1;

       end;

       readln;

end.

Var a:array[1..15] of integer;

i,s:integer;

Begin

I:=1;

While i<=15 do

Begin

Write('Nhap phan tu thu ',i,' = ');readln(a[i]);

s:=s+a[i];

i:=i+1;

End;

Write('Tong la ',s);

Readln;

End.

Var a:array:[1..1000] of integer;

i,n,max:integer;

Begin

Write('Nhap so luong phan tu n = ');readln(n);

For i:=1 to n do

Begin

Write('Nhap diem thu ',i,' = ');readln(a[i]);

End;

Write('Cac diem vua nhap la: ');

For i:=1 to n do 

Write(a[i]:8);

writeln;

max:=a[1];

For i:=2 to n do

if a[i] > max then max:=a[i];

write('So lon nhat la ',max);

Readln

End.

#include <bits/stdc++.h>

using namespace std;

long long n,i,t;

int main()

{

cin>>n;

t=0;

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

if (i%2==0) t+=i;

cout<<t;

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long n,i,t;

int main()

{

cin>>n;

t=0;

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

if (i%2!=0) t+=i;

cout<<t;

return 0;

}

Cách 1 dùng lệnh for do:

Uses crt;

var i,n,k: integer;

begin clrcsr;

readln(n);

for i:=1 to n do begin

if(i mod 2=0) and (i>=10) then k:=k*i;

end;

writeln(k);

readln;

end.

Cách 2 dùng lệnh while do

Uses crt;

var m,n,o: integer;

begin clrcsr;

readln(n);

o:=1;

m:=1;

while (m<n) do begin

m:=m+1;

if(m mod 2=0) and (m>=10) then o:=o*m;

end;

writeln(o);

readln;

end.