没毛病吧，多大数应该都可以算。
public class HelloWorld
{
public static void main(String[] args)
{
int num = 999;
int count = 0;
while(num!=0)
{
num = num / 10;
count += 1;
}
System.out.println("它是个"+count+"位的数！");
}
}
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public class HelloWorld
{
public static void main(String[] args)
{
int num = 999;
int count = 0;
while(num!=0)
{
num = num / 10;
count += 1;
}
System.out.println("它是个"+count+"位的数！");
}
}
2019-01-05
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