public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
do{count++;
num=num/10;
}
while(num>0){
System.out.println("它是个"+count+"位的数!");
}
}
}
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
do{count++;
num=num/10;
}
while(num>0);
System.out.println("它是个"+count+"位的数!");
}
}
你把do。。。while循环理解错了
while(....);←少了一个分号
do {处理}
while(条件) ;
while(num>0) 后面不能跟{}