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!");
}
}
最后的"数"后面的感叹号是中文格式的
public class HelloWorld{ public static void main(String[] args){ int num = 999; int count = 0; do{ count++; num = num / 10; //count++; }while(num > 0); System.out.println("它是个"+count+"位的数!");}}