62,614
社区成员
发帖
与我相关
我的任务
分享
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
test1();
test2();
}
//二进制
static void test1(){
System.out.print("二进制 输入一个数: ");
Scanner scanner = new Scanner(System.in);
try {
int num = scanner.nextInt();
int numTemp = num;
//System.out.println(num + "的二进制数" + Integer.toBinaryString(num));
StringBuffer sBuffer = new StringBuffer();
while(numTemp != 0){
int value = numTemp % 2;
sBuffer.append(value);
numTemp /= 2;
}
System.out.println(num + "的二进制数" + sBuffer.reverse().toString());
} catch (Exception e) {
System.out.println("输入数不合法");
}
}
//质数
static void test2(){
System.out.print("质数 输入一个数: ");
Scanner scanner = new Scanner(System.in);
try {
int num = scanner.nextInt();
for(int i = 2;i < Math.sqrt(num);i++){
if(num % i == 0){
System.out.println(num + "不是质数");
return;
}
}
System.out.println(num + "是质数");
} catch (Exception e) {
System.out.println("输入数不合法");
}
}
}
public static void main(String args[]){
Scanner input = new Scanner(System.in);
int inputNumber = input.nextInt();
erjinzhi(inputNumber);
}
public static String erjinzhi(int a){
boolean flag = true;
boolean isZhengshu = (a>=0?true:false);
if(!isZhengshu){
a = a&0xffff;
}
int temp = Math.abs(a);
StringBuffer sb = new StringBuffer();
while(flag){
int yushu = temp%2;
sb.append(yushu);
temp = temp/2;
if(temp == 0){
flag = false;
}
}
StringBuffer result = new StringBuffer();
for(int i=0;i<sb.length();i++){
result.append(sb.charAt(sb.length()-1-i));
}
System.out.print(result);
return result.toString();
}