viet chuong trình nhập vào mảng 1 chiều a gồm n phần tử là số nguyên dương (1<n<=100).Tính tổng các phần tử chia hết cho 3 tại vị trí chẵn?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a:array[1..100]of integer;
i,n,kt,dem,j:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
dem:=0;
for i:=1 to n do
if a[i]>1 then
begin
kt:=0;
for j:=2 to trunc(sqrt(a[i])) do
if a[i] mod j=0 then
begin
kt:=1;
break;
end;
if kt=0 then inc(dem);
end;
writeln('So phan tu la so nguyen to la: ',dem);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a:array[1..100]of integer;
i,n,t,max:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
max:=a[1];
for i:=1 to n do
if max<a[i] then max:=a[i];
t:=0;
for i:=1 to n do
if max=a[i] then t:=t+a[i];
writeln('Tong cac phan tu co gia tri lon nhat la: ',t);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a:array[1..100]of integer;
i,n,dem:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
dem:=0;
for i:=1 to n do
if (a[i]>0) and (i mod 2=1) then inc(dem);
writeln('So phan tu duong o vi tri le la: ',dem);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a:array[1..100]of integer;
i,n,t:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
t:=0;
for i:=1 to n do
if (a[i]<0) and (i mod 2=1) then t:=t+a[i];
writeln('Tong cac phan tu am tai vi tri le la: ',t);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a:array[1..6]of integer;
i,dem,t:integer;
begin
clrscr;
for i:=1 to 6 do
begin
write('A[',i,']='); readln(a[i]);
end;
dem:=0;
t:=0;
for i:=1 to 6 do
if a[i]>0 then
begin
inc(dem);
t:=t+a[i];
end;
writeln('So phan tu duong la: ',dem);
writeln('Tong cac phan tu duong la: ',t);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
program PSMCG;
uses crt;
const
size = 7;
var
arr: array[1..size] of integer;
i, sum, min, temp: integer;
avg: real;
begin
clrscr;
writeln('Nhap vao day so nguyen khong am gom 7 phan tu: ');
for i := 1 to size do
begin
readln(arr[i]);
end;
writeln('Cac phan tu trong day la: ');
for i := 1 to size do
begin
write(arr[i], ' ');
end;
writeln();
sum := 0;
for i := 1 to size do
begin
sum := sum + arr[i];
end;
writeln('Tong cac phan tu la: ', sum);
avg := sum / size;
writeln('Trung binh cac phan tu la: ', avg:0:2);
min := arr[1];
for i := 2 to size do
begin
if(arr[i] < min) then
begin
min := arr[i];
end;
end;
writeln('Gia tri nho nhat la: ', min);
for i := 1 to size - 1 do
begin
for j := i + 1 to size do
begin
if(arr[i] < arr[j]) then
begin
temp := arr[i];
arr[i] := arr[j];
arr[j] := temp;
end;
end;
end;
writeln('Cac phan tu da sap xep theo thu tu giam dan:');
for i := 1 to size do
begin
write(arr[i], ' ');
end;
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1:
uses crt;
var a:array[1..200]of integer;
i,n,t:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
t:=0;
for i:=1 to n do
if a[i] mod 2=0 then t:=t+a[i];
writeln(t);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var C : array [1 .. 50] of integer;
i, n : integer;
begin
clrscr;
write('Nhap so phan tu : '); readln(n);
write('Nhap day gom ', n ,' so : ');
for i := 1 to n do read(C[i]);
write('Cac gia tri chan : ');
for i := 1 to n do
if C[i] mod 2 = 0 then write(C[i], ' ');
readln
end.
uses crt;
var a:array[1..100]of integer;
i,n,t:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
t:=0;
for i:=1 to n do
if (a[i] mod 3=0) and (i mod 2=0) then t:=t+a[i];
writeln('Tong cac so chia het cho 3 o vi tri chan la: ',t);
readln;
end.