bạn có thể viêt chương trình xuất ra màn hình những số nguyên tố nhỏ hơn 100 không?
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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.
1:
#include <bits/stdc++.h>
using namespace std;
int n,x,i,t;
int main()
{
cin>>n;
t=0;
for (i=1; i<=n; i++)
{
cin>>x;
if (x%2==0) t=t+x;
}
cout<<t;
return 0;
}
uses crt;
var n,i,dem,j,t:integer;
kt:boolean;
begin
clrscr;
readln(n);
t:=0;
for i:=2 to n do
begin
kt:=true;
for j:=2 to i-1 do
if i mod j=0 then kt:=false;
if kt=true then
begin
write(i:4);
t:=t+i;
end;
end;
writeln;
writeln(t);
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;
}
câu 1
Program Nguyen_to;
Var n,i:integer;
Function NT(n:integer):Boolean;
Var ok: Boolean;
i: integer;
Begin ok:=true;
for i:=2 to n-1 do if (n mod i)= 0 then ok:=ok and false;
if n < 2 then NT:=false else NT:=ok;
End;
Begin Write('Nhap n: ');
Readln(n); i:=n;
Repeat i:=i+1;
Until NT(i);
Write('So nguyen to nho nhat lon hon ',n, 'la: ',i);
Readln End.
câu 2
uses crt;
const so: set of char=['0','1','2','3','4','5','6','7','8','9'];
var a:array[1..100] of integer;
st,b:string;
c,l,i,n,j:integer;
s, Max: integer;
begin clrscr;
write('Nhap xau:');
readln(st);
l:=length(st);
i:=1;
n:=0;
repeat if (st[i] in so) then begin b:='';
repeat b:=b+st[i];
inc(i);
until (not(st[i] in so)) or (i>l);
inc(n);
val(b,a[n],c);
end;
inc(i);
until i>l;
Max:=a[1];
for i:=2 to n do If Max<A[i] Then Max:=A[i];
Writeln('Phan tu lon nhat cua mang:', Max);
readln;
end.
program bai_1;
uses crt;
var i,n,j,d,dem:word;
begin
clrscr;
repeat
write('nhap n:');readln(n);
if (n<=0)or(n>=10000)then writeln('so ban nhap khong hop le, ban hay nhap lai:');
until (n>0)and(n<10000);
writeln('cac uoc so la so tu nhien cua ',n,' la:');
for i:=1 to n do
if n mod i=0 then write(i,' ');
writeln;
dem:=0;
for i:=2 to n do
begin
d:=0;
for j:=2 to i div 2 do
if i mod j=0 then inc(d);
if (d=0)and(n mod i=0)then inc(dem);
end;
if dem>0 then writeln('cac uoc so la so nguyen to cua ',n,' la:');
begin
d:=0;
for j:=2 to i div 2 do
if i mod j=0 then inc(d);
if (d=0)and(n mod i=0)then write(i,' ');
end;
if dem=0 then write(0);
readln;
end.
uses crt;
var a:array[1..100]of integer;
i,n,dem,kt,j:integer;
begin
clrscr;
readln(n);
for i:=1 to n do write(i:4);
writeln;
for i:=2 to n do
begin
kt:=0;
for j:=2 to i-1 do
if i mod j=0 then kt:=1;
if kt=0 then write(i:4);
end;
readln;
end.
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.
Cậu ơi sai khúc write('A[',i,']='); readln(a[i]); rồi nó cứ bị sao sao á
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 So_nguyen_to;
uses crt;
var i,dem,j:Integer;
begin clrscr;
writeln('Cac so nguyen to tu 2 den 100 la:');
for j:=2 to 100 do
begin
dem:=0;
for i:= 1 to j do if j mod i=0 then dem:=dem+1;
if dem=2 then write(j,' ');
end;
readln;
end.
qua trang của mik giúp mik mấy bài tin vs ... mik đã đăng lên rồi
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