day2 test04
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package day2;public class test04 {public static void main(String args[]){int num = 98;num = num%50;System.out.println(num);/*int x = 9;int y = 10;if(++x>9){y++;}System.out.println("x=" + x);System.out.println("y=" + y);System.out.println(-5%-2);System.out.println(8/3);*///if(x=9)编译报错//System.out.println(-5%-2);String str = "abc";System.out.println(str instanceof String);//判断其左边对象是否为其右边类的实例//逻辑运算符int x = 9;int y = 6;if(x++>9&&y++<10){x = x + y;}System.out.println("x=" + x);System.out.println("y=" + y);//&&短路//&&短路与的重要用途String s = null;if(s!=null&&s.length()==0)s = "abc";System.out.println(s);//不用第三方的变量交换两个变量的值//int x = 98;//int y = 63;/*x = x + y; y = x - y;//y2 = x + y - y = x1x = x - y;//x2 = x + y - x = y1*/x = x^y;//异或y = x^y;x = x^y;System.out.println("x=" + x);System.out.println("y=" + y);//位移实现求2的n次方int n = 3;int result = 1<<n;System.out.println(result);int a = 2;int b = (a++) + a*3;System.out.println(b);}}
