Viết chương trình kiểm tra xem số đó có phải là số nguyên tố hay không? pascal không dùng for hay while

2 câu trả lời

type int = longint; 
     bool = boolean;
var n: longint;

function prime(n: int): bool;
var i: int;
begin
    if n < 2 then exit(false);
    if n mod 2 = 0 then exit(n = 2);
    if n mod 3 = 0 then exit(n = 3);
    i:=5; repeat
        if n mod i = 0 then exit(false);
        if n mod (i + 2) = 0 then exit(false);
        inc(i, 6);
    until i * i > n;
    exit(true);
end;

begin
    readln(n);
    writeln(prime(n));
end.

uses crt;
var n: longint;

function prime(n: longint): longint;
var i: longint;
begin
    if n < 2 then exit(0);
    i:=2;
    repeat
        if n mod i = 0 then exit(0);
        inc(i);
    until i * i > n;
    exit(1);
end;

begin
clrscr;
    readln(n);
    if prime(n) = 1 then writeln('YES') else writeln('NO');
readln;
end.

Câu hỏi trong lớp Xem thêm

giup e voi I/ Supply the correct form of the verbs in brackets 1. You (think) ……………………… collecting stamps costs much money? 2. Every year, my mother (give) ……………………… me a nice doll on my birthday. 3. Jenny says she loves collecting pens but she (not/continue) ……………………… this hobby from next year. 4. If you wash your hands more, you (have)……………………. less chance of catching flu. 5. Getting plenty of rest is very good. It (help)…………………. you to avoid depression. 6. Mr. John (be) ……………………… principal of our school since last year. 7. I (see) ……………………… a car accident on this corner yesterday. 8. We like (come)……………………to school by bus, but we hate (stand)………………………. and (wait) …………………… in the rain. 9. ……………………… (you/ ever/ meet) anyone famous? 10. My mother (come) ……………………… to stay with us next weekend. 11. When he lived in Manchester, he (work) ……………………… in a bank. 12. We (be) ……………………… students for four years. 13. We are planting trees around our school now. Our school (be) ……………………… surrounded by a lot of green trees. 14. What ……………………… your father usually ……………………… (do) in the evenings? 15. My sister likes (cook) ……………………… very much. She can cook many good foods. 16. My father says when he's retired, he (go) …………………… back to his village to do the gardening. 17. They want (buy) ……………………… some meat for dinner. 18. Linh is my best friend. We (know) ……………………… each other for 5 years. 19. I enjoy (fish) ……………………… because it is relaxing. 20. How about (go) ……………………… to the movie theatre?

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