Câu 1:
program mang_chiahet3;
uses crt;
var A:array[1..100] of integer;
n,i:byte;
s:longint;
begin
clrscr;
write('Nhap n: '); readln(n);
s:=0;
for i:=1 to n do
begin
write('A[',i,']= '); readln(A[i]);
if A[i] mod 3=0 then s:=s+A[i];
end;
write('Mang vua nhap la: ');
for i:=1 to n do
write(A[i],' ');
writeln;
write('Tong cac phan tu chia het cho 3 la: ',s);
readln;
end.
Câu 2:
program thay_the;
uses crt;
var s:string[200];
vt:byte;
begin
clrscr;
write('Nhap xau: '); readln(s);
while pos('ha noi',s)<>0 do
begin
vt:=pos(ha noi',s);
delete(s,vt,6);
insert('ninhgiang',s,vt);
end;
write('Xau sau khi thay the la: ',s);
readln;
end.
