第一次上机作业

package com.company;

public class Main {

    public static void main(String[] args) {
        int a = 2;
        int b = 3;
        int tmp;
        //进行数据交换
        tmp = a;
        a = b;
        b = tmp;
        System.out.println("交换后的a:"+ a + ",b:" + b);
    }
}

　　

package com.company;

public class Main {

    public static void main(String[] args) {
//        int a = 2;
//        int b = 3;
//        int tmp;
//        //进行数据交换
//        tmp = a;
//        a = b;
//        b = tmp;
//        System.out.println("交换后的a:"+ a + ",b:" + b);

        int a = 2000;
        int ge = a % 10;
        int shi = a / 100 % 10;
        int bai = a / 10 % 100;
        int qian = a / 1000;
        int he = ge + shi + bai + qian;
        System.out.println(ge);
        System.out.println(shi);
        System.out.println(bai);
        System.out.println(qian);
        System.out.println(he);




    }
}

　　

package com.company;

public class Main {

    public static void main(String[] args) {
//        int a = 2;
//        int b = 3;
//        int tmp;
//        //进行数据交换
//        tmp = a;
//        a = b;
//        b = tmp;
//        System.out.println("交换后的a:"+ a + ",b:" + b);

//        int a = 2000;
//        int ge = a % 10;
//        int shi = a / 100 % 10;
//        int bai = a / 10 % 100;
//        int qian = a / 1000;
//        int he = ge + shi + bai + qian;
//        System.out.println(ge);
//        System.out.println(shi);
//        System.out.println(bai);
//        System.out.println(qian);
//        System.out.println(he);

        int F = 50;
        int C =(F - 32) * 5 / 9;
        System.out.println(C);
        int C1 = 10;
        int F1 = C1 * 9 / 5 + 32;
        System.out.println(F1);




    }
}

　　

package com.company;

public class Main {

    public static void main(String[] args) {
//        int a = 2;
//        int b = 3;
//        int tmp;
//        //进行数据交换
//        tmp = a;
//        a = b;
//        b = tmp;
//        System.out.println("交换后的a:"+ a + ",b:" + b);

//        int a = 2000;
//        int ge = a % 10;
//        int shi = a / 100 % 10;
//        int bai = a / 10 % 100;
//        int qian = a / 1000;
//        int he = ge + shi + bai + qian;
//        System.out.println(ge);
//        System.out.println(shi);
//        System.out.println(bai);
//        System.out.println(qian);
//        System.out.println(he);

//        int F = 50;
//        int C =(F - 32) * 5 / 9;
//        System.out.println(C);
//        int C1 = 10;
//        int F1 = C1 * 9 / 5 + 32;
//        System.out.println(F1);

        char a = 'A';
        System.out.println((char)(a + 32));




    }
}