Question

有没有哪位大神帮帮我这四题

Answer 1

见图

Answer 2

import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("上底：");
double top = input.nextDouble();
System.out.print("下底：");
double bottom = input.nextDouble();
System.out.print("高：");
double height = input.nextDouble();
double s = (top + bottom) * height / 2;
System.out.println("面积："+s);
}
}
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Calendar;
public class Test {
public static int getDays(int year ,int month){
int days = 0 ;
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month-1);
calendar.set(Calendar.DAY_OF_MONTH, 1);
days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
return days ;
}
public static void main(String[] args) {
int year = 0, moth = 0, len = 0;
System.out.print("请输入年数");
try {
BufferedReader br = new BufferedReader(new InputStreamReader(
System.in));
year = Integer.parseInt(br.readLine());
System.out.print("请输入月数");
moth = Integer.parseInt(br.readLine());
System.out.println(year+"年"+moth+"月 的天数:" + getDays(year,moth));
} catch (IOException e) {
}
}
}

追问

你这是什么鬼

Answer 3

如下

作参考：