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                1.變量 ~~~ 變量三要素:數據類型,變量名稱,變量的值 聲明變量語法:數據類型 變量名 如int age ,String name ,double score 賦值: 1.int age=10; 2.String name; name="張三"; ~~~ 2.變量使用案例 ~~~ public class Test{ public static void main(String[] args){ int number =10; System.out.println(number); } } ~~~ 3.算術運算符 ~~~ +,-,*,/,% 其中+可以是算術運算符(兩個都是數值類型),也可以是連接符 ~~~ 4.案例:根據天數(46)計算周數和剩余的天數 ~~~ public class Test{ public static void main(String[] args){ int days=46; int wek=days/7; System.out.println("有"+wek+"周"); int days1=days%7; System.out.println("剩"+days1+"天"); } } ~~~ 5.類型轉換 ~~~ 自動: int+double => double char+String => String 強制: int a=(int)10.2 //a=10 ~~~
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