public class HelloWorld{

public static void main(String[] args) {

 int age1=24;

int age2=18;

int age3=36;

int age4=27;

int sum=(age1+age2+age3+age4);

double avg=(sum/4);

int minus=(age1-age2);

int newAge=(--age1);

   System.out.println("年龄总和："+sum);

    System.out.println("平均年龄："+avg);

System.out.println("年龄差值："+minus);

System.out.println("自减后的年龄："+newAge);

}

}