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![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a,b,c:string;
i,d1,d2:integer;
begin
clrscr;
write('Nhap xau a:'); readln(a);
write('Nhap xau b:'); readln(b);
d1:=length(a);
d2:=length(b);
writeln('Tong do dai hai xau la: ',d1+d2);
c:=#32;
for i:=1 to d1 do
if (a[i] in ['A'..'Z']) or (a[i] in ['a'..'z']) then c:=c+a[i];
for i:=1 to d2 do
if b[i] in ['0'..'9'] then c:=c+b[i];
writeln('Xau c la: ',c);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a,b:string;
begin
clrscr;
write('Nhap xau a:'); readln(a);
write('Nhap xau b:'); readln(b);
writeln(length(a)+length(b));
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
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.
![](https://rs.olm.vn/images/avt/0.png?1311)
program NhapXau;
var
Chuoi_A, Chuoi_B : string;
i : integer;
begin
write('Nhap xau A: ');
readln(Chuoi_A);
writeln('Xau A la: ', Chuoi_A);
Chuoi_B := '';
for i := 1 to length(Chuoi_A) do
Chuoi_B := Chuoi_B + Chuoi_A[i];
writeln('Xau B la: ', Chuoi_B);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a,b:string;
i,d:integer;
begin
clrscr;
write('Nhap xau a:'); readln(a);
d:=length(a);
b:='';
for i:=1 to d do
if a[i] in ['A'..'Z'] then b:=b+a[i];
writeln(b);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
Program Xau;
Uses crt;
Var St: String;
i: longint;
Begin
Clrscr;
Write('Nhap xau: '); Readln(St);
For i:=1 to length(St) do
St[i] := Upcase(St[i]);
Write('St = ',St);
Readln
End.
![](https://rs.olm.vn/images/avt/0.png?1311)
Program HOC24;
var i,d1,d2: byte;
st1,st2: string[60];
begin
write('Nhap xau st1: '); readln(st1);
//---------------Câu 1-------------------
d1:=0; d2:=0;
for i:=1 to length(st1) do
begin
if st1[i]='A' then d1:=d1+1;
if st1[i]='a' then d2:=d2+1;
end;
writeln('Co ',d1,' ki tu A trong xau');
writeln('Co ',d2,' ki tu a trong xau');
//---------------------- Câu 2 --------------------
st2:='';
for i:=1 to length(st1) do if st1[i] in ['a'..'z'] then st2:=st2+st1[i];
writeln('Xau st2 la: ',st2);
//------------------------------Câu 3--------------------
for i:=1 to length(st1) do st1[i]:=upcase(st1[i]);
write('Xau st1 sau khi in hoa la: ',st1);
//--------------------------------------------------------
readln
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var st,s:string;
i,d,dem,kt,j,dem1:integer;
begin
clrscr;
write('Nhap xau:'); readln(s);
writeln('Xau vua nhap la: ',s);
d:=length(s);
for i:=1 to d do
if s[i]=#32 then delete(s,i,1);
dem:=1;
st[1]:=s[1];
for i:=1 to d do
begin
kt:=0;
for j:=1 to dem do
if s[i]=st[j] then kt:=1;
if kt=0 then
begin
inc(dem);
st[dem]:=s[i];
end;
end;
for i:=1 to dem do
begin
dem1:=0;
for j:=1 to d do
if st[i]=s[j] then inc(dem1);
writeln(st[i],' xuat hien ',dem1,' lan');
end;
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
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.
uses crt;
var a,b,c:string;
i,d1,d2:integer;
begin
clrscr;
write('Nhap xau a:'); readln(a);
write('Nhap xau b:'); readln(b);
d1:=length(a);
d2:=length(b);
writeln('Tong do dai hai xau la: ',d1+d2);
c:=#32;
for i:=1 to d1 do
if (a[i] in ['A'..'Z']) or (a[i] in ['a'..'z']) then c:=c+a[i];
for i:=1 to d2 do
if b[i] in ['0'..'9'] then c:=c+b[i];
writeln('Xau c la: ',c);
readln;
end.
Làm vậy sẽ thừa 1 kí tự trắng ở đầu tiên trong xâu C bạn nhé. Bạn nên gán c:=''; là OK nhất. Nhưng bài làm bài cũng rất tốt^^, mình chỉ góp ý lỗi sai nhỏ, chúc bạn học tốt ^^.