为什么一定要二重循环？
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num<1000000000){
while(num>0){
num=num/10;
count++;
}
System.out.println("它是个"+count+"位数！");
}
}
}
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public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num<1000000000){
while(num>0){
num=num/10;
count++;
}
System.out.println("它是个"+count+"位数！");
}
}
}
2016-11-28
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