day03(运算符)

Test01:

public class Test01 {
public static void main(String[] args)
{
//作用域1
//{中间的代码段 代码可以是一行 也可以是多行}
int i = 10;
int j = 10;
int m = 10;
int n = 10;

    //double i = 2.0;
    int minAge = 10;
    
    int x = 0;
    
    //解释代码
    /*
    int tmp = minAge;
    minAge = minAge+1;
    x = tmp;
    */
    //System.out.println("x:"+x);
    System.out.println("minAge:"+minAge);
    System.out.println(i++); //先使用 后+1
    
    //j = j+1;
    //int tmp = j;
    //j = tmp;
    
    System.out.println(++j); //先+1 后使用
    System.out.println(m--); //先使用 后-1
    System.out.println(--n); //先-1 后使用
    System.out.println("-----------");
    System.out.println(i++);
    System.out.println(++j);
    System.out.println(m--);
    System.out.println(--n);
    
    
    //i = 1>3 ? 10:100;
    //System.out.println(i);
    
    
    //String s = null;
    //System.out.println(s==null);
    
    /* 总结规律  绝对值求值 符号看%前面
    5%2 1 5%-2 1 -5%2 -1 -5%-2 -1
    */
    
    /*求值 
     * int m= 20;
     * int n= 20;
     * 求    m>=n    m<=n
     */
    /*求值
     * int x = 10；
     * int y = 10;
     * 求 x==y   x!=y;
     * */
    /*求值
     * String s = null；
     * 求  s == null;
     */
    /*求值
     * int i =2; int j = 30
     * 求  i大于40 且j小于50的结果
     * 求 i大于40 或j小于50的结果
     * 求 i大于10 且j小于50的结果
     * */
    
    // 控制台输入一个整数 判断该整数是奇数还是偶数 打印出来
    
    
    
}

}

Test02:
public class Test02 {
public static void main(String[] args)
{
Scanner f = new Scanner(System.in);
int num = f.nextInt();
String result = num%2==0 ? "偶数" : "奇数";
System.out.println(result);
}
}

Test03:
public class Test03 {
public static void main(String[] args)
{
/*
int i = 3&7;
int j = -3&-7;
System.out.println(i);
System.out.println(j);
*/
//1111 1101 -3补码
//0000 0111 7的原码
//1111 1111
//1111 1110
//1000 0001 -1

    int k = -3 | 7;
    
    //1111 1101  -3补码
    //0000 0010 2
    
    int m = ~(-3);
    
    //0000 0011  3原码
    //1111 1100   补
    //1111 1011   反
    //1000 0100 -4
    
    
    int n = ~(3);
    
    
    
    //1111 1101  -3补码
    //0000 0111
    //1111 1010
    //1111 1001
    //1000 0110 -6
    int l = -3^7;
    
    System.out.println(k);
    System.out.println(m);
    System.out.println(n);
    System.out.println(l);
    
    System.out.println(255^2565256^2565256);
}

}

Test04:
public class Test04 {
public static void main(String[] args)
{
//2
//1000 0010
//0000 1000
//0001 0000

    //3 
    //0000 0011
    //0000 1100
    
    //3
    //1111 ............ 1000 1000
    //1000 1000  -8的原码
    //1111 0111      反码
    //1111 1000     补码

//1111 1110 0000 左移两位后的补码
//1111 1101 1111 取反
//1010 0000 原码

    //-8右移两位
    //1000 1000  -8的原码
    //1111 0111      反码
    //1111 1000     补码
    //1111 1110  右移两位
    //1111 1101
    //1000 0010 
    
    
    
    System.out.println(-8<<2);
    
    //求 -0x7fffffff左移一位
    //1111 1111 1111 1111 1111 1111 1111 1111
    //1000 0000 0000 0000 0000 0000 0000 0000
    //1000 0000 0000 0000 0000 0000 0000 0001
//(1) 0000 0000 0000 0000 0000 0000 0000 0010 2
}

}

Test05:
public class Test05 {
public static void main(String[] args)
{
String ip = "192.168.5.2";

    int i = 0x4c8; //0100 1100 1000
    int mask = 0xf;//1111  掩码
    
    System.out.println(i&mask);
}

}

Test06:
public class Test06 {
public static void main(String[] args)
{
System.out.println("睁眼");
System.out.println("刷牙");
System.out.println("洗脸");
System.out.println("吃早饭");
int money = 1;
if(money == 1)
{
//假如身上一块钱
System.out.println("吃油条");
}
else
{
//假如身上五块钱
System.out.println("煎饼");
//假如身上十块钱
System.out.println("煎饼+豆浆+茶叶蛋");
//假如身上一万块钱
System.out.println("土豪");
}

    System.out.println("睁眼");
    System.out.println("上班");
    
}

}