Bài 1:
uses crt;
var st,st1:string;
d,i,d1:integer;
begin
clrscr;
write('Nhap xau ban dau:'); readln(st);
d:=length(st);
st1:='';
for i:=1 to d do
if st[i] in ['a'..'z'] then st1:=st1+st[i];
d1:=length(st1);
write('Xau ban vua tao la: ');
for i:=1 to d1 do
write(st1[i]);
readln;
end.
Bài 2:
uses crt;
var a:array[1..100]of real;
i,n:integer;
k:real;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
write('Nhap so k='); readln(k);
writeln('Cac boi cua ',k:4:2,' trong day la: ');
for i:=1 to n do
if a[i] mod k=0 then write(a[i]:4);
writeln;
writeln('Cac uoc cua ',k:4:2,' trong day la: ');
for i:=1 to n do
if k mod a[i]=0 then write(a[i]:4);
readln;
end.