/*
* abs求绝对值
*/
System.out.println(Math.abs(-10.1)); //10.1
System.out.println(Math.abs(10.4)); //10.4
System.out.println("*************");
/*
* ceil是天花板的意思,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
System.out.println(Math.ceil(0.3)); //1.0
System.out.println("*************");
/*
* floor是地板的意思,就是返回最小值
*/
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
System.out.println(Math.floor(0.3));//0.0
System.out.println("*************");
/*
* max是比较两个值返回最大值
*/
System.out.println(Math.max(-10.1, -10.0));//-10.0
System.out.println(Math.max(10.7,10));//10.7
System.out.println(Math.max(0.0, -0.0));//0.0
System.out.println("*************");
/*
* random取得一个大于或等于0.0小于不等于1.0的随机数
*/
System.out.println(Math.random());
System.out.println(Math.random()*10);//大于或等于0.0小于不等于10.0的随机数
System.out.println("*************");
/*
* rint四舍五入,返回double值
* 注意.5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
System.out.println("*************");
/*
* 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
* abs求绝对值
*/
System.out.println(Math.abs(-10.1)); //10.1
System.out.println(Math.abs(10.4)); //10.4
System.out.println("*************");
/*
* ceil是天花板的意思,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
System.out.println(Math.ceil(0.3)); //1.0
System.out.println("*************");
/*
* floor是地板的意思,就是返回最小值
*/
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
System.out.println(Math.floor(0.3));//0.0
System.out.println("*************");
/*
* max是比较两个值返回最大值
*/
System.out.println(Math.max(-10.1, -10.0));//-10.0
System.out.println(Math.max(10.7,10));//10.7
System.out.println(Math.max(0.0, -0.0));//0.0
System.out.println("*************");
/*
* random取得一个大于或等于0.0小于不等于1.0的随机数
*/
System.out.println(Math.random());
System.out.println(Math.random()*10);//大于或等于0.0小于不等于10.0的随机数
System.out.println("*************");
/*
* rint四舍五入,返回double值
* 注意.5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
System.out.println("*************");
/*
* 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