Bài 4. Viết chương trình phân tích một số nguyên thành các thừa số nguyên tố Ví dụ: Số 28 được phân tích thành 2 x 2 x 7

import java.util.Scanner;

public class Main {

   

    public static void phanTich(int n){

                        int i=2;

                        while(n>1){

                                    if(cachamchung.checkSNT(i)){

                                                if(n%i==0){

                                                            System.out.print(i+".");

                                                            n/=i;

                                                }

                                                else i++;

                                    }

                                    else i++;

                        }

            }

    public static int nhap(){

                        Scanner input= new Scanner(System.in);

                        boolean check= false;

                        int n=0;

                        while(!check){

                                    System.out.print(" ");

                                    try{

                                                n= input.nextInt();

                                                check= true;

                                    }catch(Exception e){

                                                System.out.println("Ban phai nhap so! hay nhap lai...");

                                                input.nextLine();

                                    }

                        }

                        return (n);

            }

    public static void main(String[] args) {

        System.out.print("Nhap n");

                        int n= nhap();

                        System.out.print("n= " );

                        phanTich(n);

    }

}