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uses crt;

const fi='vb.txt';

var f:text;

st:string;

begin

clrscr;

assign(f,fi); reset(f);

readln(f,st);

writeln('Xau co trong file la: ',st);

close(f);

readln;

end.

uses crt;

const fi='vb.txt';

var f1:text;

st:string;

i,d:integer;

begin

clrscr;

assign(f1,fi); rewrite(f1);

readln(st);

d:=length(st);

for i:=1 to d do 

  if st[i] in ['A'..'Z'] then write(f1,st[i]:4);

close(f1);

readln;

end.

Câu 1: 

uses crt;

var st:string;

d,i,dem:integer;

begin

clrscr;

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

d:=length(st);

write('Xau sau khi xoa so la: ');

for i:=1 to d do 

  if not(st[i] in ['0'..'9']) then write(st[i]);

writeln;

dem:=0;

for i:=1 to d do 

  if st[i]=#32 then inc(dem);

writeln('Xau co ',dem,' dau cach');

writeln('Do dai cua xau la: ',d);

readln;

end. 

Câu 2: 

uses crt;

const fi='kq.out';

var st1,st2:string;

f1:text;

begin

clrscr;

write('Nhap xau thu 1:'); readln(st1);

write('Nhap xau thu 2:'); readln(st2);

assign(f1,fi); rewrite(f1);

if length(st2)>length(st1) then writeln(f1,st2)

else writeln(f1,st1);

close(f1);

end.

const fi='vao.inp';

fo='ra.out';

var f1,f2:text;

st:string;

i,d:integer;

begin

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

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

readln(f1,st);

d:=length(st);

for i:=1 to d do 

  if st[i]='a' then delete(st,i,1);

writeln(f2,st);

close(f1);

close(f2);

end.

uses crt;

const fi='dulieu.dat';

var f1:text;

a,b,p,s:array[1..100]of real;

i,n:integer;

begin

clrscr;

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

n:=0;

while not eof(f1) do 

begin

n:=n+1;

readln(a[n],b[n]);

end;

for i:=1 to n do 

  begin

p[i]:=(a[i]+b[i])/2;

s[i]:=a[i]*b[i];

end;

for i:=1 to n do 

  writeln(p[i]:4:2,' ',s[i]:4:2);

close(f1);

readln;

end.

uses crt;

const fi='xau.txt';

var f1:text;

s:string;

i,d,kt:integer;

begin

clrscr;

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

readln(f1,s);

d:=length(s);

kt:=0;

for i:=1 to d do

if st[i]<>st[d-i+1] then kt:=1;

if kt=0 then writeln('Xau doi xung')

else writeln('Xau khong doi xung');

readln;

end.