第一次上机作业

1.package finish;

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

}

2.package finish;
import java.util.*;
public class csy {
	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.package finish;

public class csy {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		double f=100;
		double c=37;
		System.out.println((f-32)*5/9);
			System.out.println(c*9/5+32);	
		}

}

　　

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