javaDay01_小练习

package zrs;

public class Demo4 {
public static void main(String[] args) {
//练习题
//高效率的计算2*8
System.out.println("2*8="+(2<<3));

//交换两个变量的值
int a1=3;
int b1=5;
int temp=a1;
a1=b1;
b1=temp;
System.out.println("a1="+a1+",b1="+b1);
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//这个是真的66666
int a=3;
int b=5;
//不添加新的变量
a=a+b;//a=3+5=8
b=a-b;//b=8-5=3
a=a-b;//a=8-3=5
System.out.println("a="+a+",b="+b);
}
}