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 first;

public class one {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a=1;
        int b=2;
        int c=a;
        a=b;
        b=c;
        System.out.println("交换后a的值："+a);
        System.out.println("交换后b的值："+b);
        }

package dome1;

import java.util.Scanner;

public class Abc {

public static void main(String[] args) {

// TODO 自动生成的方法存根

Scanner scan = new Scanner(System.in);

int a=scan.nextInt();

int ge=a%10;

int shi=a/10%10;

int bai=a/100;

int sum=ge+shi+bai;

System.out.println("ge="+ge);

System.out.println("shi="+shi);

System.out.println("bai="+bai);

System.out.println("sum="+sum);

}

package first;

public class one {

public static void main(String[] args) {
// TODO Auto-generated method stub
//定义一个华氏度
int a=50;
//定义一个摄氏度
int b=(a-32)*5/9;
System.out.println("摄氏度="+b);
}

}

package first;

public class one {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        char a = 'A';
        System.out.println((char)(a + 32)); 
    }

}