Program HOC24;

var s: string;

begin

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

write('Xau sau khi loc: ');

for i:=1 to length(s) do

if s[i] in ['A'..'z'] then write(s[i]);

readln

end.

Var a: string;

 i, Dem: integer;

Begin

 writeln(‘nhap xau:’);

 Readln(a);

 Dem:=0;

 For i:=1 to length(a) do

 If (‘a’<=a[i]) and (a[i]<=’z’)

  Dem:= Dem+1;

 Writeln(Dem);

 Readln

End.

uses crt;

var st:string;

i,d,dem:integer;

begin

clrscr;

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

d:=length(st);

dem:=0;

for i:=1 to d do 

  if (st[i] in ['a'..'z']) or (st[i] in ['A'..'Z']) then inc(dem);

writeln(dem);

readln;

end.

 câu 1 Uses Crt;

Var St:String;

dem: Array[‘A’..’Z’] Of Byte

; i:Byte;

ch:Char;

Begin Write(‘Nhap xau St: ‘);

Readln(St);

{Khởi tạo mảng} For ch:=’A’ To ‘Z’ Do dem[ch]:=0;

{Duyệt xâu} For i:=1 To Length(St) Do If Upcase(St[i]) IN [‘A’..’Z’] Then Inc(dem[Upcase(St[i])]);

{Liệt kê các ký tự ra màn hình} For ch:=’A’ To ‘Z’ Do If dem[ch]>0 Then Writeln(ch,’ : ’,dem[ch]);

Readln;

Hehe,con sâu

2:

uses crt;

var st:string;

d,i,dem1,dem2:integer;

begin

clrscr;

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

d:=length(st);

dem1:=0;

dem2:=0;

for i:=1 to d do

  begin

if st[i] in ['0'..'9'] then inc(dem1);

if (st[i] in ['a'..'z']) or (st[i] in ['A'..'Z']) then inc(dem2);

end;

writeln('So ki tu la chu so la: ',dem1);

writeln('So ki tu la chu cai la: ',dem2);

for i:=1 to d do 

  if st[i] in ['0'..'9'] then delete(st,i,1);

writeln('Xau sau khi xoa cac chu so la: ',st);

readln;

end. 

Program HOC24;

var s: string;

i: byte;

begin

write('Nhap xau S: '); readln(s);

write('Cac chu cai in hoa: ');

for i:=1 to length(s) do if s[i] in ['A'..'Z'] then write(s[i],' ');

writeln;

for i:=1 to length(s) do if s[i] in ['a'..'z'] then write(s[i],' ');

readln

end.

Program HOC24;

var s: string;

tg,d,max,i: byte;

code: integer;

begin

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

// cau a

for i:=1 to length(s) do if s[i] in ['a'..'z'] then write(upcase(s[i]));

//------

writeln;

//-cau b

for i:=length(s) downto 1 do if s[i] in ['0'..'9'] then write(s[i]);

//------

writeln;

//---cau c

d:=0;

for i:= 1 to length(s) do

if s[i] in ['0'..'9'] then 

begin

val(s[i],tg,code);

if tg>max then max:=tg;

d:=d+1;

end;

if d=0 then write('Khong co chu so trong day') else write('Chu so lon nhat la : ',max);

readln 

end.

uses crt;

var st,st1:string;

d,i,d1,max,x,y:integer;

begin

clrscr;

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

d:=length(st);

writeln('Day cac ki tu thuong doi sang chu hoa la: ');

for i:=1 to d do 

  if st[i] in ['a'..'z'] then write(upcase(st[i]):4);

st1:='';

for i:=1 to d do 

  if st[i] in ['0'..'9'] then st1:=st1+st[i];

d1:=length(st1);

for i:=d1 downto 1 do 

  write(st1[i]:4);

writeln;

max:=0;

for i:=1 to d1 do 

  begin

val(st1[i],x,y);

if max<x then max:=x;

end;

writeln('Chu so lon nhat trong xau la: ',max);

readln;

end.

Var a: string;

  i, Dem: integer;

Begin

 writeln(‘nhap xau:’);

 Readln(a);

 Dem:=0;

 For i:=1 to length(a) do

 If (‘A’<=a[i]) and (a[i]<=’Z’) then

  Dem:= Dem+1;

 Writeln(Dem);

 Readln

End.