第一次上机作业

1.已知a,b均是整型变量，写出将a,b两个变量中的值互换的程序。（知识点：变量和运算符综合应用） 

package diyici;

public abstract class diyici {
        public static void main(String[] args) {
            // TODO Auto-generated method stub
                int a = 100;
                int b = 200;
                int c;
                System.out.println("交换前的a:"+ a + ",b:" + b);    
                c = a;
                a = b;
                b = c;
                System.out.println("交换后的a:"+ a + ",b:" + b);    
            }

2.给定一个0~1000的整数，求各位数的和

package diyici;

import java.util.*;

public abstract class diyici {

       public static void main(String[] args) {

           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.华氏度50转成摄氏度是多少？

     

  package diyici;

import java.util.*;

 

public abstract class diyici {

 

       public static void main(String[] args) {

           // TODO Auto-generated method stub

           double f=50;

           double c=37;

           System.out.println((f-32)*5/9);

              System.out.println(c*9/5+32);  

           }

 

    }

 

       

    

4.给定一个任意的大写字母A~Z，转换为小写字母。 （知识点：变量和运算符）

package diyici;
import java.util.*;

public abstract class diyici {

        public static void main(String[] args) {
            char c='A';
                 System.out.println((char)(c+32));
            }
    }