課程

/后端開(kāi)發(fā)

/Java

/Java入門第一季（IDEA工具）升級(jí)版

public?class?HelloWorld{
public?static?void?main(String[]?args){
int?num?=?999;
int?count?=?0;

while(num?>?0){
????num?=?num?/?10;
????count++;
????}
System.out.println("它是個(gè)"+count+"位的數(shù)!");

}
}