運算子

%：取餘 模運算

！= ：不等於

package operator;
​
public class Demo01 {
  public static void main(String[] args) {
    //二元運算
    //ctrl + D  :複製當前行到下一行
    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/(double)b);
   }
}
​
 

package operator;
​
public class Demo02 {
  public static void main(String[] args) {
    long a =123123123123l;
    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
   }
}
​

package operator;
​
public class Demo03 {
  public static void main(String[] args) {
    //關係運算符返回的結果 ： 正確 ， 錯誤   布林值
    // if
​
    int a =10 ;
    int b = 20;
    int c =21;
​
    //取餘：模運算
    System.out.println(c%a); // c / a    21 / 10 =2 …… 1
​
    System.out.println(a>b);
    System.out.println(a<b);
    System.out.println(a==b);
    System.out.println(a!=b);
   }
}
​