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.

Program HOC24;

var tg,t,n: integer;

begin

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

t:=0;

while n<>0 do

begin

tg:=n mod 10;

t:=t+tg;

n := n div 10;

end;

write('Tong cac chu so cua ',n,' la: ', t);

readln

end.

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.

tham khảo

Var i ,n : integer;

S , T : real;

Begin

write ('n=') ; read (n) ;

S:= 0;

T:= 1;

For i:= 1 to n do

S:= S + i;

T:= T * i;

Writeln (' Tong cua ' ,n,' so dau tien la' , S );

Writeln (' Tich của ' ,n,' so dau tien la' , T );

Readln;

End.

#include <bits/stdc++.h>

using namespace std;

long long i,n,t;

int main()

{

cin>>n;

t=0;

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

cout<<t;

return 0;

}

var i,n: integer;

       s:real;

begin

write(‘Nhập n: ‘); readln(n);

i:=1;

repeat 

s:=s+1/i;

i:=i+1;

until i=n;

write(‘s =‘, s:0:4);

readln

end.

Program Hotboy ;

Uses crt; 

Var n,i,s : real;

Begin

Writeln(‘nhap n’);  readln(n);

Repeat 

S:=S+ 1/i;

I:=i+1 ; 

Until n=i; 

Writeln(‘S=’,S);

Readln

End.

bạn tham khảo nha

uses crt;

var i,n:integer;

s:real;

begin

clrscr;

readln(n);

s:=0;

for i:=1 to n do s:=s+1/i;

writeln(s:4:2);

readln;

end.

program SumOfNumbers;

uses crt;

var
  n, i, sum: integer;
  numbers: array[1..100] of integer;

begin
  clrscr;
  write('Enter n: ');
  readln(n);

  // Tạo mảng các số tự nhiên từ 1 đến n
  for i := 1 to n do
    numbers[i] := i;

  // Tính tổng các số tự nhiên từ 1 đến n
  sum := 0;
  for i := 1 to n do
    sum := sum + numbers[i];

  writeln('The sum of the first ', n, ' natural numbers is: ', sum);
  readln;
end.

 Var i,n:integer;

s:longint;

Begin

Write('n = ');readln(n);

For i:=1 to n do

s:=s+i;

Write('Tong la ',s);

Readln;

End.

Câu 3: 

uses crt;

var n,i,kt:integer;

begin

clrscr;

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

if n>1 then 

begin

kt:=0;

for i:=2 to trunc(sqrt(n)) do 

  if n mod i=0 then kt:=1;

if kt=0 then writeln(n,' la so nguyen to')

else writeln(n,' la hop so');

end

else writeln(n,' khong la so nguyen to cung khong la hop so');

readln;

end.

Uses Crt; 

Var i,n:longint; S: real;

Begin

Clrscr;

For i:=1 to n do S:=S+1/n;

Write(S);

Readln

End.