public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num>=100&&num<=999)
{
System.out.println("它是个3位的数")；
}else if (num>=10&&num<=99){
"他是两位数"
}
}
}
import java.util.Scanner;
public class test {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.print("请输入:");
int number = input.nextInt();
int count = 0;
if(number == 0){
System.out.println("它是个1位的数");
}else{
while(number != 0){
number /= 10;
count++;
}
System.out.println("它是个"+count+"位的数");
}
}
}if (num >= 0 && num<=999999999){
while(num != 0){
count++;
num/=10;
}
System.out.println("它是个"+ count+"位的数！");
} else{
System.out.println("输入有误！");
}