题目
描述
如图所示，为题目截图。
解答源码
思路：对于给定的整数N，查找[2,N)的所有质数添加到列表之中，然后依次用列表中的数从小到大去除N，如果能整除，则N的规模减小，减小后的N重复上述操作。源码如下：1
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144import java.util.ArrayList;
import java.util.Scanner;
public class Main {
private static String[][] num = new String[10][5];
static{
num[0][0] = " - ";
num[0][1] = "| |";
num[0][2] = " ";
num[0][3] = "| |";
num[0][4] = " _ ";
num[1][0] = " ";
num[1][1] = " |";
num[1][2] = " ";
num[1][3] = " |";
num[1][4] = " ";
num[2][0] = " - ";
num[2][1] = " |";
num[2][2] = " - ";
num[2][3] = "| ";
num[2][4] = " - ";
num[3][0] = " - ";
num[3][1] = " |";
num[3][2] = " - ";
num[3][3] = " |";
num[3][4] = " - ";
num[4][0] = " ";
num[4][1] = "| |";
num[4][2] = " - ";
num[4][3] = " |";
num[4][4] = " ";
num[5][0] = " - ";
num[5][1] = "| ";
num[5][2] = " - ";
num[5][3] = " |";
num[5][4] = " - ";
num[6][0] = " - ";
num[6][1] = "| ";
num[6][2] = " - ";
num[6][3] = "| |";
num[6][4] = " - ";
num[7][0] = " - ";
num[7][1] = " |";
num[7][2] = " ";
num[7][3] = " |";
num[7][4] = " ";
num[8][0] = " - ";
num[8][1] = "| |";
num[8][2] = " - ";
num[8][3] = "| |";
num[8][4] = " - ";
num[9][0] = " - ";
num[9][1] = "| |";
num[9][2] = " - ";
num[9][3] = " |";
num[9][4] = " - ";
}
public static void main(String[] args) {
Scanner cin = new Scanner(System.in);
while(cin.hasNextInt())
{
int inputNum = cin.nextInt();
ArrayList<Integer> rslt = getRslt(inputNum);
if(rslt.size() == 0){
rslt.add(inputNum);
}
//打印乘积
printNum(rslt);
}
}
public static ArrayList<Integer> getRslt(int x){
ArrayList<Integer> allZhishu = getZhishuArray(x);
ArrayList<Integer> rslt = new ArrayList<Integer>();
int i = 0;
while(x > 1){
if(i >= allZhishu.size()){
break;
}
if(x % allZhishu.get(i) == 0){
x = x / allZhishu.get(i);
rslt.add(allZhishu.get(i));
i = 0;
}else{
i ++;
}
}
return rslt;
}
public static ArrayList<Integer> getZhishuArray(int x){
ArrayList<Integer> allZhishu = new ArrayList<Integer>();
//获取x范围内的所有质数
for(int i = 2; i < x; i ++){
boolean isZhishu = true;
double tmp = Math.sqrt(i);
for(int j = 2; j < tmp; j ++){
if(i % j == 0){
isZhishu = false;
break;
}
}
if(isZhishu){
allZhishu.add(i);
}
}
return allZhishu;
}
public static void printNum(ArrayList<Integer> rslt){
String[] printStr = new String[]{"","","","",""};
for(int i = 0; i < rslt.size(); i ++){
String s = String.valueOf(rslt.get(i));
for(int j = 0; j < s.length(); j ++){
int inex = Integer.valueOf(s.charAt(j)-48);
printStr[0] += num[inex][0];
printStr[1] += num[inex][1];
printStr[2] += num[inex][2];
printStr[3] += num[inex][3];
printStr[4] += num[inex][4];
}
if(i < rslt.size() - 1){
printStr[0] += " ";
printStr[1] += " ";
printStr[2] += "*";
printStr[3] += " ";
printStr[4] += " ";
}
}
for(int i = 0; i < 5; i ++){
System.out.println(printStr[i]);
}
}
}