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Program bt_3;
Uses crt;
Var Tong, n, i: integer;
Begin
Clrscr;
Writeln(‘nhap n=’);
Readln (n);
Tong:=0;
For i:=1 to n do
If I mod 2 = 1 then Tong:= Tong+i;
Writeln(‘Tong la:’,Tong);
Readln
End.
Program bt_3;
Uses crt;
Var Tong, n, i: integer;
Begin
Clrscr;
Writeln(‘nhap n=’);
Readln (n);
Tong:=0;
For i:=1 to n do
If I mod 2 = 0 then Tong:= Tong+i;
Writeln(‘Tong la:’,Tong);
Readln
End.
Program bt_3;
Uses crt;
Var Tong, n, i: integer;
Begin
Clrscr;
Writeln(‘nhap n=’);
Readln (n);
Tong:=0;
For i:=1 to n do
If I mod 5 = 0 then Tong:= Tong+i;
Writeln(‘Tong la:’,Tong);
Readln
End.
Program bt_3;
Uses crt;
Var Tong, n, i: integer;
Begin
Clrscr;
Writeln(‘nhap n=’);
Readln (n);
Tong:=0;
For i:=1 to n do
If I mod 3 = 0 then Tong:=Tong+i;
Writeln(‘Tong la:’,Tong);
Readln
End.
Var i,k,n,bk,tong: integer;
a: array[1..1000] of integer;
Begin
write('Nhap K: '); readln(k);
write('Nhap N: '); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
{câu a}
For i:=1 to n do
if a[i]=k then bk:=bk+1;
writeln('Co so phan tu bang k la:',k);
{câu b}
For i:=1 to n do
if a[i]=k then
begin
write(i,' ');
tong:=tong+a[i];
end;
write('. Tong la:',tong);
readln
end.
uses crt;
var k,n,tong,d,i:longint;a:array[1..1000]of longint;
begin
clrscr;
write('n=');readln(n);
write('k=');readln(k);
for i:=1 to n do
begin
write('a[',i,']=');readln(a[i]);
end;
d:=0;
for i:=1 to n do if(a[i]=k)then inc(d);
writeln('so phan tu bang voi:',k,' la:',d);
write('cac so co vi tri bang voi:',k,' la:');
tong:=0;
for i:=1 to n do if(a[i]=k)then
begin
write(i,' ');
tong:=tong+a[i];
end;
write('tong cua cac so bang voi:',k,' la:',tong);
readln;
end.
2:
#include <bits/stdc++.h>
using namespace std;
int main()
{
int n,i,kt=0;
cin>>n;
for (int i=2; i*i<=n; i++)
if (n%i==0) kt=1;
if (kt==0) cout<<"YES";
else cout<<"NO";
}
x:integer;
y:byte;