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program Le_Nho_Hon_Hoac_Bang_n;
uses crt;
var
n, i: integer;
begin
clrscr;
write('Nhap vao mot so nguyen duong n: ');
readln(n);
while n <= 0 do
begin
writeln('So ban nhap khong hop le. Xin vui long nhap lai: ');
readln(n);
end;
clrscr;
writeln('Cac so le nho hon hoac bang ', n, ' la:');
i := 1;
while i <= n do
begin
if i mod 2 <> 0 then
writeln(i);
i := i + 1;
end;
readln;
end.
Câu 1:
uses crt;
var n,i,dem,j,kt1,kt2,a,b,kt:integer;
begin
clrscr;
write('Nhap n='); readln(n);
dem:=0;
if n mod 2=1 then
begin
a:=2;
b:=n-a;
kt:=0;
for i:=2 to trunc(sqrt(b)) do
if b mod i=0 then kt:=1;
if kt=0 then inc(dem);
end
else begin
for i:=2 to n div 2 do
begin
a:=i;
b:=n-i;
kt1:=0;
kt2:=0;
for j:=2 to trunc(sqrt(a)) do
if a mod j=0 then kt1:=1;
for j:=2 to trunc(sqrt(b)) do
if b mod j=0 then kt2:=1;
if (kt1=0) and (kt2=0) then inc(dem);
end;
end;
writeln('So cach phan tich ',n,' thanh tong hai so nguyen to la: ',dem);
readln;
end.
Câu 2:
uses crt;
var n,x:integer;
{-----------------ham-kiem-tra-nguyen-to-----------------}
function ktnt(x:integer):boolean;
var kt:boolean;
i:integer;
begin
kt:=true;
for i:=2 to trunc(sqrt(x)) do
if x mod i=0 then
begin
kt:=false;
break;
end;
if kt=true then ktnt:=true
else ktnt:=false;
end;
{---------------ham-kiem-tra-so-doi-xung---------------}
function ktdx(x:integer):boolean;
var kt:boolean;
d,i:integer;
st:string;
begin
str(x,st);
d:=length(st);
kt:=true;
for i:=1 to d do
if st[i]<>st[d-i+1] then
begin
kt:=false;
break;
end;
if kt=true then ktdx:=true
else ktdx:=false;
end;
{--------------chuong-trinh-chinh---------------}
begin
clrscr;
repeat
write('Nhap n='); readln(n);
until n>0;
if (ktnt(n)=true) and (ktdx(n)=true) then writeln(n,' la so nguyen to doi xung')
else writeln(n,' khong la so nguyen to doi xung');
x:=n+1;
repeat
x:=x+1;
until (ktnt(x)=true) and (ktdx(x)=true);
writeln('So nguyen to doi xung nho nhat lon hon ',n,' la: ',x);
readln;
end.
Program HOC24;
var n,d,i: integer;
B: array[1..100] of integer;
t: longint;
begin
write('Nhap N: '); readln(n);
for i:=1 to n do
begin
write('B[',i,']='); readln(b[i]);
end;
d:=0; t:=0;
for i:=1 to n do
if b[i]>0 then
begin
d:=d+1;
t:=t+b[i];
end;
writeln('Tong cac so duong trong day so la: ',t);
write('Co ',d,' so duong trong day');
readln
end.
uses crt;
var b:array[1..100] of longint;
n,i,d,s:longint;
begin
clrscr;
write('n='); readln(n);
for i:=1 to n do
begin
write('a[',i,']: '); readln(b[i]);
if b[i]>0 then begin
inc(d);
inc(s,b[i]);
end;
end;
writeln('Tong cac so duong: ',s);
writeln('Co ',d,' so duong');
readln;
end.
Program HOC24;
var a: array[1..32000] of integer;
i,n,d: integer;
begin
write('Nhap N: ');
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
write('Day vua nhap la: ');
for i:=1 to n do write(a[i],' '); writeln;
d:=0;
for i:=1 to n do if a[i]>0 then d:=d+1;
write('Co ',d,' so duong');
readln
end.
Program HOC24;
var a: array[1..32000] of integer;
i,max,min,n: integer;
begin
write('Nhap so phan tu N: '); readln(N);
for i:=1 to n do
begin
write('a[',i,']='); readln(a[i]);
end;
max:=a[1]; min:=a[1];
for i:=1 to n do
begin
if a[i]>max then max:=a[i];
if a[i]<min then min:=a[i];
end;
writeln('So nho nhat la :',max);
write('So lon nhat la: ',min);
readln
end.
uses crt;
var a:array[1..100]of integer;
i,n,max,min: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];
min:=a[1];
for i:=1 to n do
begin
if max<a[i] then max:=a[i];
if min>a[i] then min:=a[i];
end;
writeln('So lon nhat la: ',max);
writeln('So nho nhat la: ',min);
readln;
end.
program SoChanDenN;
var
n, i: Integer;
begin
Write('Nhap n: ');
Readln(n);
Write('Cac so chan tu 1 den ', n, ' la: ');
for i := 1 to n do
begin
if i mod 2 = 0 then
Write(i, ' ');
end;
end.
program BaiTap;
var
A: array[1..150] of integer;
N, i, sum: integer;
begin
write('Nhap so phan tu cua day A (N <= 150): ');
readln(N);
for i := 1 to N do
begin
write('Nhap phan tu thu ', i, ': ');
readln(A[i]);
end;
writeln('Day so vua nhap la:');
for i := 1 to N do
write(A[i], ' ');
writeln;
sum := 0;
for i := 1 to N do
if A[i] mod 2 = 0 then
sum := sum + A[i];
writeln('Tong cac phan tu chan trong day la: ', sum);
readln;
end.
#include <bits/stdc++.h>
using namespace std;
long long i,n,kt,j;
int main()
{
cin>>n;
for (i=2; i<=n; i++)
{
kt=0;
for (j=2; j*j<=i; j++)
if (i%j==0) kt=1;
if (kt==0) cout<<i<<" ";
}
return 0;
}