二元运算符

class Scratch {
public static void main(String[] args) {
//二元运算符
//ctrl+D 复制到下一行
int a = 10;
int b = 20;
int c = 30;
int d = 40;

    System.out.println(a+b);
    System.out.println(a-b);
    System.out.println(a*b);
    System.out.println(a/(double)b);
    //=======================================
    System.out.println("=======================================");

    long e =151445665846545L;
    int  r= 132;
    short t=10;
    byte  y= 8;

    System.out.println(e+r+t+y);  //long
    System.out.println(r+t+y);    //int
    System.out.println((double)t+y);   //int


    System.out.println("=======================================");
    //关系运算符返回的结果； 正确 ；错误  布尔值
    //if

    int q=10;
    int z=20;
    int x=21;

    System.out.println(x%q);  //c/a    21/10

    System.out.println(q>z);
    System.out.println(q<z);
    System.out.println(q==z);
    System.out.println(q!=b);

    System.out.println("=======================================");
    //++ -- 自增 自减 一元运算符

    int s =3;
    int f=s++;//执行这行代码，先赋值，在自增
    //a++  a=a+1
    int g=++s;//执行这行代码，先自增，再赋值
    //++a a=a+1

    System.out.println(s);
    System.out.println(f);
    System.out.println(g);