public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
do{
if(num<=0){
break;
}
num = num/10;
count++;
}while(num>0);
System.out.println("它是個"+count+"位的數！");
}
}
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
for(;num>1;num=num/10){
count=count+1;
}
System.out.println("它是個"+count+"位的數！");
}
}
最簡單沒有之一
