Java笔记 --- 算术运算符

算术运算符是对数值类型的变量进行运算的。

package demo01;

public class Arithmetic {
    public static void main(String[] args) {
        System.out.println(+1);
        System.out.println(-3);
        System.out.println(4 + 2);
        System.out.println(4 - 2);
        System.out.println(4 * 2);
        System.out.println(4 / 2);
        System.out.println(5 % 2);
        int i = 1;
        i++;
        System.out.println(i);
        i--;
        System.out.println(i);
        --i;
        System.out.println(i);
        ++i;
        System.out.println(i);
        System.out.println(i + "hello");
    }
}

package demo02;

public class test {
    public static void main(String[] args) {
        int i = 1;
        i = i++;//temp = i;i = i + 1; i = temp
        System.out.println(i);//1
        i = ++i;//i = i + 1; temp = i;i = temp;
        System.out.println(i);//2
    }
}

package demo02;

public class Test01 {
    public static void main(String[] args) {
        int i = 10;
        int b = 20;
        int c = i++;
        System.out.println(c);//10
        System.out.println(b);//20
        c = --b;
        System.out.println(c);//19
        System.out.println(b);//19

    }
}

假如还有59天放假，问:合xx个星期零xx天

package demo02;

public class Test02 {
    public static void main(String[] args) {
        int day = 59;
        int week = day / 7;
        int weeks = day % 7;
        System.out.println("合"+week+"个星期零"+weeks+"天");
    }
}

定义一个变量保存华氏温度，华氏温度转换摄氏温度的公式为: 5/9*(华氏温度-100),请求出华氏温度对应的摄氏温度。

package demo02;

public class Test03 {
    public static void main(String[] args) {
        double degree = 285.3; //华式温度
        double celsius = 5.0 / 8 * (degree - 100);
        System.out.println("摄氏温度为:"+celsius);
    }
}