JAVA学习02基本运算符

package com.zwxx.demo01;

/**

• @author

• @version

• @since
  */
  public class TestA {
  public static void main(String[] args) {
  //二元运算符
  int a1 = 10;
  int b1 = 20;
  int c1 = 25;
  int d1 = 25;

   System.out.println("1:  ");
   System.out.println(a1+b1);
   System.out.println(a1-b1);
   System.out.println(a1*b1);
   System.out.println(a1/(double)b1);
   System.out.println("-----------------------------------");
  
  
   long a2 = 123123123123L;
   int b2 = 123;
   short c2 = 10;
   byte d2 = 8;
  
   //如果两个数的多个操作中有一个数为long输出就是long  如果没有long就是int
   System.out.println("2:  ");
   System.out.println(a2+b2+c2+d2);    //long
   System.out.println(b2+c2+d2);       //int
   System.out.println(c2+d2);          //int
   System.out.println("-----------------------------------");
  
  
   int a3 = 10;
   int b3 = 20;
   int c3 = 21;
  
   System.out.println("3:  ");
   System.out.println(c3%a3);
   System.out.println(a3>b3);
   System.out.println(a3<b3);
   System.out.println(a3==b3);
   System.out.println(a3!=b3);
   System.out.println("-----------------------------------");
  
   //++ -- 自增，自减 一元运算符
   int a4 = 10;
   int b4 = a4++;          //a4++：执行完这行代码后，先给b4赋值，再自增
   //a4++   a4 = a4 +1
   int c4 = ++a4;          //++a4：执行完这行代码前，先自增，再给b赋值
   //++a4   a4 = a4 +1
  
   System.out.println("4:  ");
   System.out.println(a4);
   System.out.println(b4);
   System.out.println(c4);
   System.out.println("-----------------------------------");
  
   boolean a5 =true;
   boolean b5 =false;
  
   //逻辑与运算：两个变量都为真，结果才为true
   //逻辑或运算：两个变量有一个为真，则结果才为true
   //非运算：真的变成假，假的变成真
   System.out.println("5:  ");
   System.out.println("a5 %% b5:"+(b5&&a5));
   System.out.println("a5 || b5:"+(b5||a5));
   System.out.println("!(a5 %% b5):"+!(b5&&a5));
  
   //短路运算  遇到错误就会结束 不会执行下去
   int c5 = 5;
   boolean d5 = (c5<4)&&(c4++<4);
   System.out.println(d5);
   System.out.println(c5);
   System.out.println("-----------------------------------");
   /*
   * @
   *
   * */
  
   /*
   A   = 0011 1100
   B   = 0000 1101
   A&B = 0000 1100         同时为1 才是1
   A|B = 0011 1101         有1 就是1
   A^B = 0011 0001         相同为0 不同为1
   ~B  = 1111 0010         取反
  
   << 左移  *2
   >> 右移  /2
   0000 0001       1
   0000 0010       2
   0000 0100       4
   0000 1000       8
   0001 0000       16
   */
   System.out.println(2<<3); //16
   System.out.println("-----------------------------------");
  
  
   //  x ? y : z
   //如果x==true，则结果为y，否则结果为z
   int score = 80;
   String type = score < 60 ? "不及格":"及格";
   System.out.println(type);
  

  }

}