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.

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 

  t:=t+a[i];

writeln('Tong cac so la: ',t);

writeln('Trung binh cong cac so la: ',t/n:4:2);

readln;

end.

program TimBoi4ChuSo;
var
  n, i: integer;
begin
  repeat
    writeln('Nhap vao so nguyen n (2<n<100): ');
    readln(n);
  until (n > 2) and (n < 100);
  
  writeln('Cac boi cua ', n, ' co 4 chu so la: ');
  for i := 1000 to 9999 do
  begin
    if i mod n = 0 then
      writeln(i);
  end;
end.

Đề thiếu điều kiện rồi bạn

Thêm mật khẩu là gì nữa em ơi!

program MultiplesOfN;
var
  n, i: integer;
begin
  repeat
    write('Nhap vao so nguyen duong n (0<n<100): ');
    readln(n);
  until (n > 0) and (n < 100);

  writeln('Cac boi so cua ', n, ' co 4 chu so la:');

  for i := 1000 to 9999 do
  begin
    if (i mod n = 0) then
    begin
      writeln(i);
    end;
  end;

  readln;
end.

#include <bits/stdc++.h>

using namespace std;

long long a,b,t;

int main()

{

cin>>a>>b>>t;

if (t==a+b) cout<<"chuc mung ban da tinh dung";

else cout<<"rat tiec ban da lam sai";

return 0;

}

lỗi r bn

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.

alo

Var a:array[1..20] of integer;

i,n,d:integer;

Begin

For i:=1 to 20 do

Begin

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

if a[i] = 3 then d:=d+1;

End;

Write('Co ',d,' chu so 3');

Readln

End.