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![](https://rs.olm.vn/images/avt/0.png?1311)
a = int(input("Nhập số nguyên dương a: "))
while a <= 0:
a = int(input("Số bạn nhập không phải số dương, vui lòng nhập lại: "))
print("Bạn đã nhập đúng quy tắc")
![](https://rs.olm.vn/images/avt/0.png?1311)
program Le_Nho_Hon_Hoac_Bang_n;
uses crt;
var
n, i: integer;
begin
clrscr;
write('Nhap vao mot so nguyen duong n: ');
readln(n);
while n <= 0 do
begin
writeln('So ban nhap khong hop le. Xin vui long nhap lai: ');
readln(n);
end;
clrscr;
writeln('Cac so le nho hon hoac bang ', n, ' la:');
i := 1;
while i <= n do
begin
if i mod 2 <> 0 then
writeln(i);
i := i + 1;
end;
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
program Min;
uses crt;
var i,n:integer;
begin
clrscr;
write('Nhap n: '); readln(n);
write('Cac so le nho hon hoac bang ',n,'la :');
for i:=1 to n do if i mod 2 = 1 then write(i:4);
readln
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
uses crt;
var n,i,s:integer;
begin
clrscr;
write('Nhap n='); readln(n);
s:=0;
for i:=1 to n do
if i mod 6=0 then s:=s+i;
writeln(s);
readln;
end.
Bài 2:
uses crt;
var a,b,c,ucln,i:integer;
begin
clrscr;
write('a='); readln(a);
write('b='); readln(b);
write('c='); readln(c);
while a<>b do
begin
if a>b then a:=a-b
else b:=b-a;
end;
ucln:=a;
while ucln<>c do
begin
if ucln>c then ucln:=ucln-c
else c:=c-ucln;
end;
writeln(ucln);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a,b:integer;
begin
clrscr;
readln(a,b);
if (a>b) then writeln(b,' ',a)
else writeln(a,' ',b);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var n,i,t,s:integer;
begin
clrscr;
repeat
readln(n);
until n<>0;
t:=0;
for i:=1 to n do if i mod 2=0 then t:=t+i;
writeln(t);
s:=1;
for i:=1 to n do
if i mod 2=1 then s:=s*i;
writeln(s);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;var n: longint; chrn: string; valn,sum,max,i,preperror: byte;begin write('Nhap so can kiem tra: '); readln(n); str(n,chrn); for i:=1 to length(chrn) do begin val(chrn[i],valn,preperror); sum:=sum+valn; if max<valn then max:=valn; valn:=0 end; writeln('Ket qua: '); writeln(length(chrn)); writeln(sum); write(max); readln;end.uses crt;var n: longint; chrn: string; valn,sum,max,i,preperror: byte;begin write('Nhap so can kiem tra: '); readln(n); str(n,chrn); for i:=1 to length(chrn) do begin val(chrn[i],valn,preperror); sum:=sum+valn; if max<valn then max:=valn; valn:=0 end; writeln('Ket qua: '); writeln(length(chrn)); writeln(sum); write(max); readln;end.
Program HOC24;
var N:longint;
max,tg,t,d: integer;
Begin
write('Nhap N : '); readln(N);
max:=0;
while n<>0 do
begin
tg:=n mod 10;
d:=d+1;
t:=t+tg;
if tg>max then max:=tg;
n:=n div 10;
end;
writeln('So nguyen N co ',d,' chu so');
writeln('Tong cac chu so cua N la : ',t);
write('Chu so lon nhat cua N la :',max);
readln
end.
uses crt;
var a,b:integer;
begin
clrscr;
repeat
write('Nhap a='); readln(a);
write('Nhap b='); readln(b);
until a>=b;
readln;
end.