public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
do{count++;
num/=10
}
while(num>0);
System.out.println("它是个"+count+"位的数！");
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
for(; num > 0; count++){
num /= 10;
}
System.out.println("它是个" +count +"位的数！");
}
}
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
while(num!=0){
num/=10;
count++;
}
System.out.println("它是个"+count+"位的数！");
}
}