第一次Java上机作业

package bao01;

public class Lei01 {
    public static void main(String[] args)
    {
        int a=1;
        int b=2;
        int c=a;
        a=b;
        b=c;
        System.out.println("a="+a);
        System.out.println("b="+b);
    }
}

第一题

第二题

package bao01;

import java.util.Scanner;

public class Lei01 {
    public static void main(String[] args)
    {
        
        @SuppressWarnings("resource")
        Scanner scan=new Scanner(System.in);
        int i=scan.nextInt();
        int X1=i/1000;
        int X2=i/100%10;
        int X3=i/10%10;
        int X4=i%10;
        System.out.println(X1+X2+X3+X4);
    }
}

第三题

package bao01;

public class Lei01 {
    public static void main(String[] args)
    {
        double hs=50;
        System.out.println((hs-32.0)*5/9);
    }
}

第四题

package bao01;

public class Lei01 {
    public static void main(String[] args)
    {
        char c='A';
        System.out.println((char)(c+32));
    }
}