public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num != 0 && num >= 999999999);{
while(num != 0){
num = num / 10;
count++;
}
System.out.println("它是个"+ count + "位的数！");
} else{
System.out.println("输入有误！");
}
}
}
正确代码
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num != 0 && num <= 999999999){
while(num != 0){
num = num / 10;
count++;
}
System.out.println("它是个"+ count + "位的数！");
} else{
System.out.println("输入有误！");
}
}
}if(num>=0&&num<=999999999){}
int num = 999;
int count = 0;
for(int i=1;i<100;i++){
++count;
if(num<10){
System.out.println("它是个"+count+"位的数！");
break;
}
num = num/10;
}