Uses crt;

var n,i: integer;

begin clrscr;

readln(n);

for i:=1 to n do if( i mod 2<>0) then write(i:3);

readln;

end.

uses crt;

var i,n:longint;

begin 

writeln('nhap n'); readln(n);

for i:=1 to n do if i mod 2 =1 then 

writeln(i);

readln;

end.

ngu ththế mà cũng ko làm được về lớp 1 mà học

uses crt;

var i:integer;

begin

clrscr;

i:=1;

while i<=10 do 

  begin

if i mod 2=1 then write(i:4);

i:=i+1;

end;

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;

}

n = int(input("Nhap n: "))
sum_even = 0
for i in range(2, n+1, 2):
    sum_even += i
print("Tong cac so chan lien tiep den", n, "la:", sum_even)

python ha:0?

program tinhtong;

uses crt;

var i, n, s: integer;

begin clrscr;

Write('N so tu nhien dau tien la: ');

readln(n);

s:=0;

i:=1;

while i<=n do begin

s:=s+i;

i:=i+1;

end;

writeln('Tong cac so la: ',s);

readln

end.

program tinhtong;

uses crt;

var i,n,t:longint;

a:array[1..100]of longint;

begin

clrscr;

write('nhap so n:');readln(n);

for i:=1 to n do 

begin

write('nhap phan tu a[',i,']:');readln(a[i]);

end;

t:=0;i:=1;

repeat

t:=t+i;

i:=i+1;

until i=n;

writeln('tong cua ca so tren la:',t);

writeln('trung binh cua cac so tren la:',t/n);

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;

}

Bài 1: 

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('Tong cac so trong khoang tu 1 den ',n,' la: ',s);

readln;

end.

Bài 2: 

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;

i:=i+2;

end;

writeln('Tong cac so le trong khoang tu 1 den ',n,' la: ',s);

readln;

end.

uses crt;

var s,i,n:integer;

begin

clrscr;

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

s:=0; i:=1;

while i<=n do

begin

s:=s+i;

i:=i+2;

end;

writeln(s);

readln;

end.