Bài 1:
program oken;
uses crt;
var s: string;
k: char;
dem,i: byte;
begin
clrscr;
write('Nhap 1 xau: '); readln(s);
write('Nhap 1 ki tu k: '); readln(k);
dem:=0;
for i:=1 to length(s) do
if k=s[i] then
dem:=dem+1;
writeln('So ki tu la ',k,' co trong xau: ',dem);
readln;
end.
Bài 2:
program oken;
uses crt;
var s1,s2: string;
begin
clrscr;
write('Nhap xau thu 1: '); readln(s1);
write('Nhap xau thu 2: '); readln(s2);
if s1[2]=s2[length(s2)] then
writeln('2 ki tu trung nhau: ',s1[2])
else
writeln('2 ki tu khong trung nhau');
readln;
end.
Bài 3:
program oken;
uses crt;
var s: string;
i,dem: byte;
begin
clrscr;
write('Nhap xau: '); readln(s);
dem:=0;
for i:=1 to length(s) do
if (s[i] in ['a'..'z']) or (s[i] in ['A'..'Z']) then
dem:=dem+1;
writeln('So tu co trong xau: ',dem);
readln;
end.