1)
program ct;
uses crt;
var i,n:integer;
s:longint;
begin clrscr;
write('Nhap so n: '); readln(n);
s:=0; i:=1;
while i<=n do
begin
i:=i+1;
if i mod 2<>0 then s:=s+i;
end;
writeln('Tong s la: ',s);
readln;
end.
2)
program ct;
uses crt;
var A:array[1..1000];
i,n:integer;
S:longint;
begin clrscr;
write('Nhap so phan tu n: '); readln(n);
for i:=1 to n do
begin
writeln('Nhap A[',i,']: '); readln(A[i]);
end;
S:=0;
for i:=1 to n do
if A[i] mod 2=0 then S:=S+A[i];
writeln('Tong cac so duong la: ',S);
readln;
end.
Học tốt!