program bai1;
uses crt;
var i:integer;
s,s1:string;
begin
  clrscr;
  write('nhap S:');readln(s);
  while pos('C',s)<>0 do
  begin
    insert('LOP11A',s,pos('C',s));
    delete(s,pos('C',s),1);
  end;
  writeln('xau sau khi bien doi la: ',s);
  writeln('do dai cua xau tren la: ',length(s));
  write('nhap s1:');readln(s1);
  if s1[1]=s[1] then writeln('ki tu dau cua hai xau trung nhau')
  else writeln('ki tu dau cua hai xau khong trung nhau');
  readln;
end.

const fi='kt.txt';

fo='kq.out';

var f1,f2:text;

s:string;

i,dem,d:integer;

begin

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

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

readln(f1,s);

vt:=pos('anh',s);

while vt<>0 do

begin

delete(s,vt,3);

insert(s,vt,'em');

vt:=pos('anh',s);

end;

writeln(f2,s);

close(f1);

close(f2);

end.

Bài 1:

uses crt;

var S:String;

vt:integer;

begin

clrscr;

Write(‘Nhap 1 xau:’); Readln(S);

While pos(‘nang’,s)>0 do

Begin

Vt:= pos(‘nang’,s);

Delete(s,vt,4);

Insert(‘mua’,s ,vt);

End;

Writeln(‘Xau sau khi thay the ’,s);

Readln;

End.

Bài 2: 

uses crt;

var st:string;

d,i,kt:integer;

begin

clrscr;

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

d:=length(st);

kt:=0;

for i:=1 to d do 

  if st[i]<>st[d-i+1] then kt:=1;

if kt=0 then writeln(st,' la xau doi xung')

else writeln(st,' khong la xau doi xung');

readln;

end.

Program hotrotinhoc;

var s: string;

t,c,i: byte;

begin

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

t:=0;

for i:=1 to length(s) do

if s[i] in ['1'..'9'] then

begin

val(s[i],c);

t:=t+c;

end;

write(t);

readln

end.

Thu gọn

xau = input("Nhập vào một xâu bất kì: ")

xau_moi = xau.replace("choi", "hoc")

print("Xâu mới sau khi thay thế là:", xau_moi)

Program HOC24;

var s: string;

d: byte;

begin

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

while pos('choi',s)<>0 do

begin

d:=pos('choi',s);

delete(s,d,4);

insert('hoc',s,d);

end;

write('Xau sau khi thay la: ',s);

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]=#32 then inc(dem);

writeln(dem);

readln;

end.

uses crt;

var s:string;

i,d:integer;

begin

clrscr;

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

d:=length(s);

for i:=1 to d do 

  s[i]:=upcase(s[i]);

writeln(s);

readln;

end.

Cho em lời giải với ạ em đang thi ạ