public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num>1&num<=999999999){
while(num!=0){
count++;
num/=10;
}
System.out.println("它是个"+count+"三位数!");
}else{
System.out.println("输入有误");
}
}
}
if(num>1&&num<=999999999) 少了个&
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num>=0&&num<=999999999){
while(num!=0){
count++;
num/=10;
}
System.out.println("它是个"+ count +"位的数！");
}
else{
System.out.println("输入有误");
}
}
}
saal;fw;