New knowledge today

1、 Operator % Take the remainder , for example x%y, When x<y when ,x%y be equal to x, Such as 1%5=1;x>y when ,x%y It's the remainder , Such as 7%5=2.

2、if Statement else Write but not write , If there are other circumstances, you can write else if.

3、switch case Medium case And then ：, If a certain case When the conditions , It's going to go all the way down , Until I met break, perhaps default.

4、 Automatic type conversion int And long,int You can automatically type into long, and long Cannot be automatically converted to int, But in this way you can ,int n=5; n+=5L; This is the time long type 5L Automatically convert to int It's shaped .

5、~ It's a bit operator , Namely the 0 become 1, hold 1 become 0.

If there is any mistake, please point out ~