基本运算符01

public static void main(String[] args) {
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*c);
System.out.println(a/(double)d);

    long e =123456789L;
    int f =123;
    short g =10;
    byte h =8;

//加减乘除!

    System.out.println(e+f+g+h);//long
    System.out.println(f+g+h);//int
    System.out.println(g+h);//int
}

//大于小于等于，%取余，模运算