public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
while(num!=0){
num/=10;
count++;
}
System.out.println("它是个"+count+"位的数！");
}
}
public class HelloWorld{
public static void main(String[] args) {
int a=12;
int b=24;
int sum = a + b ;
System.out.println("两数之和为："+sum);
}
}
public class HelloWorld {
public static void main(String[] args) {
int shu=0;
int he=0;
do{
shu=shu+1;
if(shu%2==0){
he=he+shu;
}
}while(shu<=50);
System.out.println(he);
