Var i, n, S: integer;

Begin 

Read(n);

S:=0;

If i mod 2 = 1 then while i:=1 to n do S:=S+i;

Write (S);

Readln;

End.

Ko bt đúng ko :)

Tham khảo:

Program BTH;
uses crt;
var i,n,s:longint;
Begin
        clrscr;
        write('Nhap n: ');readln(n);
        i:=1;
        While i<>n do
        Begin
                If i mod 2=1 then s:=s+i;
                i:=i+1;
        end;
        writeln('Tong day so tren la: ',s);
        readln;
end.

uses crt;

var n,i,s:integer;

begin

clrscr;

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

s:=0;

i:=1;

while i<=n do 

  begin

s:=s+i;

inc(i);

end;

writeln(s);

readln;

end.

ae nào giúp mình với ạ'

n = int(input("Nhập số nguyên n: "))

tong = 0

i = 1

while i <= n:

          tong += i

          i += 1

print("Tổng các số từ 0 đến", n, "là:", tong)

uses crt;

var n,i,t,x:integer;

begin

clrscr;

readln(n);

t:=0;

while n>0 do 

begin

x:=n mod 10;

if x mod 2=0 then t:=t+x;

n:=n div 10;

end;

writeln(t);

readln;

end.

https://hoc24.vn/cau-hoi/viet-chuong-trinh-tinh-tong-cac-so-chan-tu-1-toi-n-voi-n-duoc-nhap-tu-ban-phim-bang-vong-lap-whiledo.4935914584802

Thank you <3

Câu 1:

program Tinhtong:

var

     n, i, sum: integer;

begin

     write('Nhap n: ');

     readln(n);

     sum := 0;

     for i := 2 to n do

     begin

          if i mod 2 = 0 then

          begin

               sum := sum + i;

          end;

     end;

     writeln('Tong cac so chan tu 2 toi ', n, ' la ', sum);

     readln; 

end.

Câu 2:

program Tinhtong:

var

     n, i, sum: integer;

begin

     write('Nhap n: ');

     readln(n);

     sum := 0;

     for i := 1 to n do

     begin

          if i mod 2 = 1 then

          begin

               sum := sum + i;

          end;

     end;

     writeln('Tong cac so le tu 1 toi ', n, ' la ', sum);

     readln;

end.

Sao tới 3 end vậy

Tham khảo:

Program BTH;
uses crt;
var i,n,s:longint;
Begin
        clrscr;
        write('Nhap n: ');readln(n);
        i:=1;
        While i<>n do
        Begin
                If i mod 2=0 then s:=s+i;
                i:=i+1;
        end;
        writeln('Tong day so tren la: ',s);
        readln;
end.

program tinh_tong_chan;

uses crt;

Var i,N,S: integer;

begin

clrscr;

writeln('nhap so n');

readln(N);

S:=0;

i:=1;

while i <= N do

begin

S:=S+i;

i:=i+1;

end;

Writeln('tong la: ',S);

readln;

end.

đây bạn nha

while..do

Program HOC24;

uses crt;

var i,n: integer;

S: longint;

begin

clrscr;

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

i:=0; s:=0;

while i<n do

begin

i:=i+1;

s:=s+i*(i+1);

end;

write('S=',S);

readln

end.

For..do

Program HOC24;

uses crt;

var i,n: integer;

S: longint;

begin

clrscr;

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

s:=0;

for i:=1 to n do s:=s+i*(i+1);

write('S=',S);

readln

end.

program TongN;

var

     n, i, tong: integer;

begin

     tong := 0;

     writeln('Nhap so nguyen duong N: ');

     readln(n);

     i := 0;

     while i < n do

     begin

          i := i + 1;

          tong := tong + i;

     end;

     writeln('Tong cac so tu 1 den ', n, ' la ', tong);

     readln;

end.