第一次上机作业

1.

package chap1;

 

public class Tast {

 

    public static void main(String[] args) {

    int a = 3, b = 5,c;

        c=a;

        a=b;

        b=c;

        System.out.println("a=" + a+"b="+b);  }

}

2. package chap1;

 

import java.util.Scanner;

 

public class Tast {

 

    public static void main(String[] args) {

                //一个三位数整数，求各位整数的和

                System.out.println("请输入一个1~1000的整数：");

                Scanner sc = new Scanner(System.in);

                int a = sc.nextInt();

                int b, c, d, e, sum;

                e = a / 1000;

                b = a / 100 % 10;

                c = a  / 10 % 10;

                d = a % 10;

                sum = b +c +d +e;

                System.out.println("结果为" + sum);

            }

}

3.

package chap1;

 

public class Tast {

 

    public static void main(String[] args) {

        double f=50;//华氏度

        System.out.println((f-32.0)*5/9);

            }

}

4.package chap1;

 

public class Tast {

 

    public static void main(String[] args) {

        char a = 'A';

        System.out.println((char)(a + 32));

            }