Java第一次上机作业

 

①
public class ddd {

 public static void main(String[] args) {
  // TODO Auto-generated method stub

 

int a = 100;
int b = 200;
int c;
//进行数据交换
c = a;
a = b;
b = c;
System.out.println("交换后的a:"+ a + ",b:" + b);
}
 
}

②

package zuoye;

import java.util.Scanner;

public class dddm {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Scanner r= new Scanner(System.in);
  System.out.println("输入一个四位数");
  int a = r.nextInt();
  int g,s,b,q,sum;
  q= a/1000;
  b = a/100%10;
  s= a/10%10;
  g= a%10;
  sum = g+s+b+q;
  System.out.println(sum);
  
 }

}

③

package dmh;

import java.util.Scanner;

public class zuoyew {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Scanner r = new Scanner(System.in);
  System.out.println("输入华氏温度");
  double  H = r.nextDouble();
  double C = (H-32)*5/9;
  System.out.println("摄氏温度："+C);
  
 }

}

④

package zuoye;

public class zzy {

 public static void main(String[] args) {
  // TODO Auto-generated method stub

  String a = "i miss you";
  String A = a.toUpperCase();
  System.out.println("原字符串："+a);
  System.out.println("大写字符串："+A);
 }

}