1.

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,' , S );

Writeln (' Tich của ' ,n,', T );

Readln;

End.

2.

program SumAndProductOfNumbers;

var
  n, m, i, sum, product: integer;

begin
  writeln('Enter the values of n and m: ');
  readln(n, m);
  
  sum := 0;
  product := 1;
  
  for i := n to m do
  begin
    sum := sum + i;
    product := product * i;
  end;
  
  writeln('The sum of numbers from ', n, ' to ', m, ' is: ', sum);
  writeln('The product of numbers from ', n, ' to ', m, ' is: ', product);
end.

3.

program SumAndProductOfNumbers;

var
  i, sum, product: integer;

begin
  sum := 0;
  product := 1;
  
  for i := 10 to 25 do
  begin
    sum := sum + i;
    product := product * i;
  end;
  
  writeln('The sum of numbers from 10 to 25 is: ', sum);
  writeln('The product of numbers from 10 to 25 is: ', product);
end.

Cách 1: Có sử dụng chương trình con

uses crt;

var st:string;

{------------chuong-trinh-con-------------------}

function doi(st1:string):string;

var i,d:integer;

begin

d:=length(st1);

for i:=1 to d do 

  st1[i]:=upcase(st1[i]);

doi:=st1;

end;

{-------------------chuong-trinh-chinh--------------------}

begin

clrscr;

write('Nhap xau:'); readln(st);

writeln(doi(st));

readln;

end.

Cách 2: Không sử dụng chương trình con

uses crt;

var st:string;

i,d:integer;

begin

clrscr;

write('Nhap xau:'); readln(st);

d:=length(st);

for i:=1 to d do 

  st[i]:=upcase(st[i]);

writeln(st);

readln;

end.

*Cách có sử dụng chương trình con:

uses crt;

var st:string;

{--------------chuong-trinh-con---------------}

function doixau(st:string):string;

var i,d:integer;

begin

   d:=length(st);

   for i:=1 to d do

     st[i]:=upcase(st[i]);

   doixau:=st;

end;

{-------------chuong-trinh-chinh---------------}

begin

clrscr;

write('Nhap xau:'); readln(st);

writeln('Xau doi sang chu hoa la: ',doixau(st));

readln;

end.

*Cách không sử dụng chương trình con:

uses crt;

var st:string;

i,d:integer;

begin

clrscr;

write('Nhap xau:'); readln(st);

d:=length(st);

for i:=1 to d do 

 st[i]:=upcase(st[i]);

writeln('Xau sau khi doi la: ',st);

readln;

end.

uses crt;

var a:array[1..100]of integer;

min,n,i:integer;

{----------------chuong-trinh-con-------------------}

function nn(x,y:integer):integer;

begin

if x<y then nn:=x

else nn:=y;

end;

{-----------------chuong-trinh-chinh-----------------}

begin

clrscr;

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

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

min:=nn(a[1],a[2]);

for i:=3 to n do 

  if min>a[i] then min:=a[i];

writeln(min);

readln;

end.

const fi='input.txt'

fo='output.txt'

var f1,f2:text;

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

i,n,t:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

n:=0;

while not eof(f1) do 

begin

inc(n);

read(f1,a[n]);

end;

t:=0;

for i:=1 to n do t:=t+a[i];

write(f2,t);

close(f1);

close(f2);

end.

var a:Array [1..100] of word;

      n,i:byte;

      S:word;

begin

 write('Nhap so so hang trong day : n = '); readln(n);

 for i:=1 to n do begin

                          write('A[',i,'] = '); 

                          readln(A[i]);

                         end;

S:=0;

for i:=1 to n do if A[i] mod 2 = 1 then S:=S+A[i];

if S = 0 then write('Trong day khong co so le nao nen khong tong khong ton tai') else write('Tong cac so le trong day la : S = ',S);

readln

end.