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uses crt;

const fi='dulieu.txt';

var f1:text;

st:string;

i,d:integer;

begin

clrscr;

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

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

d:=length(st);

for i:=1 to d do 

if (st[i] in ['A'..Z']) or (st[i] in ['0'..'9']) or (st[i]=#32) then write(f1,st[i]);

close(f1);

end.

1:

uses crt;

const fi='ketqua.txt';

var f1:text;

st:string;

i,d:integer;

begin

clrscr;

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

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

d:=length(st);

for i:=1 to d do 

 if st[i]=#32 then delete(st,i,1);

writeln(f1,st);

close(f1);

end.

2:

uses crt;

var a,b,c,d:integer;

{----------chuong-trinh-con-----------------------}

function min(x,y:integer):integer;

begin

if x<y then min:=x

else min:=y;

end;

{---------------chuong-trinh-chinh--------------------}

begin

clrscr;

write('a='); readln(a);

write('b='); readln(b);

write('c='); readln(c);

write('d='); readln(d);

writeln(min(a,min(b,min(c,d))));

readln;

end.

uses crt;

const fi='dulieu.txt';

var f1:text;

st:string;

i,d:integer;

begin

clrscr;

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

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

d:=length(st);

for i:=1 to d do 

if (st[i] in ['A'..Z']) or (st[i] in ['0'..'9']) or (st[i]=#32) then write(f1,st[i]);

close(f1);

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.

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.

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.

Bài 3: 

uses crt;

const fi='teptong.txt';

var a,b:integer;

f1:text;

begin

clrscr;

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

readln(a,b);

writeln(a+b);

writeln(f1,a+b);

close(f1);

readln;

end.

Uses crt;

Var st:string;

I,d:integer;

Begin

Clrscr;

Write('nhap xau:'); readln(st);

D:=length(st);

While st[d]=#32 do

Begin

Delete(st,d,1);

D:=length(st);

End;

For i:=1 to d do

If (st[i]=#32) and (st[i+1]=#32) then delete(st,i,1);

Writeln(st);

Readln;

End.