Câu 1:

uses crt;

var a:array[1..10]of integer;

i,n,t:integer;

begin

clrscr;

write('n='); readln(n);

if (n>0) and (n<=10) then

begin

t:=0;

for i:=1 to n do

begin

write('a[',i,']='); readln(a[i]);

t:=t+a[i];

end;

writeln('tong cua day so la: ',t);

end

else writeln('vui long nhap lai');

readln;

end.

Câu 2:

uses crt;

var b:array[1..20]of integer;

i,n:integer;

begin

clrscr;

write('n='); readln(n);

if (n>0) and (n<=20) then

begin

for i:=1 to n do

begin

write('b[',i,']='); readln(b[i]);

end;

for i:=1 to n do

write(b[i]:4);

end

else writeln('vui long nhap lai');

readln;

là

uses crt;
var a:array[1..20]of integer;
i,t:integer;
begin
clrscr;
for i:=1 to 20 do
begin
repeat
write('a[',i,']='); readln(a[i]);
if a[i]<0 then writeln('ban da nhap sai, yeu cau ban nhap lai');
until a[i]>=0;
end;
t:=0;
for i:=1 to 20 do
if (a[i] mod 2=0) and (i mod 2=1) then t:=t+a[i];
writeln('tong cac phan tu la so chan o vi tri le trong day la: ',t);
readln;
end.

Bài 2:

uses crt;
var a:array[1..150]of longint;
i,dem,n:integer;
begin
clrscr;
write('n='); readln(n);
if n<=150 then
begin
for i:=1 to n do
begin
repeat
write('a[',i,']='); readln(a[i]);
if a[i]>=1000 then writeln('ban da nhap sai, yeu cau ban nhap lai');
until a[i]<1000;
end;
{----------------------------------------------------------}
dem:=0;
for i:=1 to n do
if a[i]>0 then inc(dem);
writeln('so luong so duong trong day la: ',dem);
end;
readln;
end.