二元运算符

package operator;

public class Demo01 {
    public static void main(String[] args) {
        //二元运算符
        //ctrl + D : 复制当前行到下一行

        int a = 10;
        int b = 20;
        int c = 25;
        int d = 25;
        System.out.println(a+b);
        System.out.println(a-b);
        System.out.println(a*b);
        System.out.println(a/b);//=0.5
        System.out.println(a/(double)b);
    }
}

package operator;

import com.sun.xml.internal.ws.api.model.wsdl.WSDLOutput;

public class Demo02 {
    public static void main(String[] args) {


        long a = 123123123123123L;
        int b = 123;
        short c = 10;
        byte d = 8;

        System.out.println(a+b+c+d);//long
        System.out.println(b+c+d);//int
        System.out.println(c+d);//int
        //含有long就是long类型
        //其他相加都是int
        //含有double那就是double
        //不能把String转换为int
    }
}

package operator;

public class Demo3 {
    public static void main(String[] args) {
        //关系运算符返回结果： 正确，错误 布尔值
        //if

        int a = 10;
        int b = 20;
        int c = 21;

        System.out.println(c%a);//c/a 21/10 = 2 ... 1//取余 模运算

        System.out.println(a>b);
        System.out.println(a<b);
        System.out.println(a==b);
        System.out.println(a!=b);
    }
}