Cau 1:

Câu 2:

#include <bits/stdc++.h>

using namespace std;

long long n;

int main()

{

cin>>n;

if (n>0 && n%5==0) cout<<"Phai";

else cout<<"Khong phai";

}

Bài 1: 

uses crt;

var n,i,s:integer;

begin

clrscr;

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

s:=0;

i:=1;

while i<=n do 

  begin

s:=s+i;

inc(i);

end;

writeln('Tong cac so trong khoang tu 1 den ',n,' la: ',s);

readln;

end.

Bài 2: 

uses crt;

var n,i,s:integer;

begin

clrscr;

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

s:=0;

i:=1;

while i<=n do 

  begin

s:=s+i;

i:=i+2;

end;

writeln('Tong cac so le trong khoang tu 1 den ',n,' la: ',s);

readln;

end.

alo

uses crt;

var a:array[1..100]of integer;

i,n,t,kt,j:integer;

begin

clrscr;

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

for i:=1 to n do

begin

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

end;

writeln('Cac so vua nhap la: ');

for i:=1 to n do 

  write(a[i]:4);

writeln;

t:=0;

for i:=1 to n do 

  t:=t+a[i];

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

kt:=0;

for j:=2 to trunc(sqrt(t)) do 

  if t mod j=0 then 

    begin

kt:=1;

break;

end;

if kt=0 then writeln(t,' la so nguyen to')

else writeln(t,' khong la so nguyen to');

readln;

end.

uses crt;

var a:array[1..100]of integer;

i,n,t,kt:integer;

begin

clrscr;

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

for i:=1 to n do

begin

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

end;

writeln('Cac so ban vua nhap la: ');

for i:=1 to n do 

write(a[i]:4);

writeln;

t:=0;

for i:=1 to n do

t:=t+a[i];

writeln('Tong cac so vua nhap la: ',t);

if t>=2 then 

begin

kt:=0;

for i:=2 to trunc(sqrt(t)) do 

  if t mod i=0 then 

begin

kt:=1;

break;

end;

 if kt=0 then writeln(t,' la so nguyen to')

else writeln(t,' khong la so nguyen to');

end

else writeln(t,' khong la so nguyen to');

readln;

end.

program bai_toan;

var

      N, i, sum: integer;

begin

      write('Nhap so N: ');

      readln(N);

      write('Cac uoc cua ', N, ' khong ke ', N, ' la: ');

      for i := 1 to N - 1 do

            if N mod i = 0 then

                  write(i, ' ');

      writeln;

      sum := 0;

      for i := 1 to N - 1 do

      begin

            if N mod i = 0 then sum := sum + i;

      end;

      if sum = N then writeln(N, ' la so hoan hao')

      else writeln(N, ' khong phai la so hoan hao');

      writeln;

      writeln('Tat ca so hoan hao trong pham vi 1 -> ', N, ' la:');

      for i := 1 to N do

      begin

            sum := 0;

            for j := 1 to i - 1 do

            begin

                  if i mod j = 0 then sum := sum + j;

            end;

            if sum = i then writeln(i);

      end;

      readln;

end.

program hello;

uses crt;

Var n,i,j,k: integer;

a: array[1..50] of integer;

begin;

a[1]:=k;

Readln(n);

For i:=1 to n do

Begin;

Writeln('nhap a[',i,'] '); Readln(a[i]);

End;

For i:=1 to n-1 do

For j:=i+1 to n do

If a[i]<a[j] then k:=a[j];

Writeln('gia tri lon nhat la', k);

end.