为什么代码中的num/=10, 是显示的num的位数？
public class HelloWorld{
public static void main(String[] args){
int num = 9999;
int count = 0;
if(num>0&&num<=999999999){
while(num!=0){
count++;
num/=10;
}
System.out.println("他是个"+count+"位的数");
}else{
System.out.println("输入有误！");
}
}
}
public static void main(String[] args){
int num = 9999;
int count = 0;
if(num>0&&num<=999999999){
while(num!=0){
count++;
num/=10;
}
System.out.println("他是个"+count+"位的数");
}else{
System.out.println("输入有误！");
}
}
}
