#include <bits/stdc++.h>

using namespace std;

long long a,b;

//chuongtrinhcon

long long ucln(long long a,long long b)

{

if (b==0) return(a);

else return(ucln(b,a%b));

}

//chuongtrinhchinh

int main()

{

cin>>a>>b;

cout<<ucln(a,b);

return 0;

}

a)

program UCLN_va_BCNN;

uses crt;

var a,b,c,r,p:integer;

begin

clrscr;

write('nhap a,b:');readln(a,b);

if a<b then 

begin

c:=a;

a:=b;

b:=c;

end;

p:=a*b;

r:=a mod b;

while r<>0 do

begin

a:=b;

b:=r;

r:=a mod b;

end;

writeln('UCLN la: ',b);

writeln('BCNN la: ',p div b);

readln;

end.

b)

program fibonaci;

uses crt;

var i,n:integer;

a:array[1..30]of integer;

begin

clrscr;

repeat

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

if (n<1)or(n>30) then writeln('so n phai lon hon hoac bang 1 va nho hon hoac bang 30:);

until (n>=1)and(n<=30);

a[1]:=1;

a[2]:=1;

for i:=3 to n do

a[i]:=a[i-1]+a[i-2];

writeln(n,' so fibonaci dau tien la:');

for i:=1 to n do

write(a[i]:3);

readln;

end.

var a,b,i,t,s: word;

begin

repeat

writeln('Nhap A,B vao: (cach nhau boi dau Enter)');

readln(a);

read(b);

writeln('Nhap lai gia tri A,B: ');

until (a>=1) and (b>=1) and (a<=10000) and (b<10000);

s:=a+b;

t:=a*b;

if s<t then i:=s else i:=t;

while (s mod i <> 0) or (t mod i <> 0) do i:=i-1;

writeln('UCLN cua A+B va AB: ',i);

writeln('So du khi chia AB cho A+B: ', t mod s);

end.

#include <bits/stdc++.h>

using namespace std;

long long a,b;

int main()

{

cin>>a>>b;

cout<<a+b<<endl;

cout<<a-b;

return 0;

}

Tạo chương trình như sau: