- public class MathDemo {
- public static void main(String args[]){
- /**
- * abs求绝对值
- */
- System.out.println(Math.abs(-10.4)); //10.4
- System.out.println(Math.abs(10.1)); //10.1
- /**
- * ceil天花板的意思，就是返回大的值，注意一些特殊值
- */
- System.out.println(Math.ceil(-10.1)); //-10.0
- System.out.println(Math.ceil(10.7)); //11.0
- System.out.println(Math.ceil(-0.7)); //-0.0
- System.out.println(Math.ceil(0.0)); //0.0
- System.out.println(Math.ceil(-0.0)); //-0.0
- /**
- * floor地板的意思，就是返回小的值
- */
- System.out.println(Math.floor(-10.1)); //-11.0
- System.out.println(Math.floor(10.7)); //10.0
- System.out.println(Math.floor(-0.7)); //-1.0
- System.out.println(Math.floor(0.0)); //0.0
- System.out.println(Math.floor(-0.0)); //-0.0
- /**
- * max 两个中返回大的值,min和它相反，就不举例了
- */
- System.out.println(Math.max(-10.1, -10)); //-10.0
- System.out.println(Math.max(10.7, 10)); //10.7
- System.out.println(Math.max(0.0, -0.0)); //0.0
- /**
- * random 取得一个大于或者等于0.0小于不等于1.0的随机数
- */
- System.out.println(Math.random()); //0.08417657924317234
- System.out.println(Math.random()); //0.43527904004403717
- /**
- * rint 四舍五入，返回double值
- * 注意.5的时候会取偶数
- */
- System.out.println(Math.rint(10.1)); //10.0
- System.out.println(Math.rint(10.7)); //11.0
- System.out.println(Math.rint(11.5)); //12.0
- System.out.println(Math.rint(10.5)); //10.0
- System.out.println(Math.rint(10.51)); //11.0
- System.out.println(Math.rint(-10.5)); //-10.0
- System.out.println(Math.rint(-11.5)); //-12.0
- System.out.println(Math.rint(-10.51)); //-11.0
- System.out.println(Math.rint(-10.6)); //-11.0
- System.out.println(Math.rint(-10.2)); //-10.0
- /**
- * round 四舍五入，float时返回int值，double时返回long值
- */
- System.out.println(Math.round(10.1)); //10
- System.out.println(Math.round(10.7)); //11
- System.out.println(Math.round(10.5)); //11
- System.out.println(Math.round(10.51)); //11
- System.out.println(Math.round(-10.5)); //-10
- System.out.println(Math.round(-10.51)); //-11
- System.out.println(Math.round(-10.6)); //-11
- System.out.println(Math.round(-10.2)); //-10
- }
- }
- public class MathDemo {
- public static void main(String args[]){
- /**
- * abs求绝对值
- */
- System.out.println(Math.abs(-10.4)); //10.4
- System.out.println(Math.abs(10.1)); //10.1
- /**
- * ceil天花板的意思，就是返回大的值，注意一些特殊值
- */
- System.out.println(Math.ceil(-10.1)); //-10.0
- System.out.println(Math.ceil(10.7)); //11.0
- System.out.println(Math.ceil(-0.7)); //-0.0
- System.out.println(Math.ceil(0.0)); //0.0
- System.out.println(Math.ceil(-0.0)); //-0.0
- /**
- * floor地板的意思，就是返回小的值
- */
- System.out.println(Math.floor(-10.1)); //-11.0
- System.out.println(Math.floor(10.7)); //10.0
- System.out.println(Math.floor(-0.7)); //-1.0
- System.out.println(Math.floor(0.0)); //0.0
- System.out.println(Math.floor(-0.0)); //-0.0
- /**
- * max 两个中返回大的值,min和它相反，就不举例了
- */
- System.out.println(Math.max(-10.1, -10)); //-10.0
- System.out.println(Math.max(10.7, 10)); //10.7
- System.out.println(Math.max(0.0, -0.0)); //0.0
- /**
- * random 取得一个大于或者等于0.0小于不等于1.0的随机数
- */
- System.out.println(Math.random()); //0.08417657924317234
- System.out.println(Math.random()); //0.43527904004403717
- /**
- * rint 四舍五入，返回double值
- * 注意.5的时候会取偶数
- */
- System.out.println(Math.rint(10.1)); //10.0
- System.out.println(Math.rint(10.7)); //11.0
- System.out.println(Math.rint(11.5)); //12.0
- System.out.println(Math.rint(10.5)); //10.0
- System.out.println(Math.rint(10.51)); //11.0
- System.out.println(Math.rint(-10.5)); //-10.0
- System.out.println(Math.rint(-11.5)); //-12.0
- System.out.println(Math.rint(-10.51)); //-11.0
- System.out.println(Math.rint(-10.6)); //-11.0
- System.out.println(Math.rint(-10.2)); //-10.0
- /**
- * round 四舍五入，float时返回int值，double时返回long值
- */
- System.out.println(Math.round(10.1)); //10
- System.out.println(Math.round(10.7)); //11
- System.out.println(Math.round(10.5)); //11
- System.out.println(Math.round(10.51)); //11
- System.out.println(Math.round(-10.5)); //-10
- System.out.println(Math.round(-10.51)); //-11
- System.out.println(Math.round(-10.6)); //-11
- System.out.println(Math.round(-10.2)); //-10
- }
- }