Math.round()
就是数学中的四舍五入,举例:
System.out.println("Math.round(1.2)="+Math.round(1.2));
System.out.println("Math.round(1.5)="+Math.round(1.5));
System.out.println("Math.round(1.7)="+Math.round(1.7));
System.out.println("Math.round(-1.2)="+Math.round(-1.2));
System.out.println("Math.round(-1.5)="+Math.round(-1.5));
System.out.println("Math.round(-1.7)="+Math.round(-1.7));
结果输出为:
Math.round(1.2)=1
Math.round(1.5)=2
Math.round(1.7)=2
Math.round(-1.2)=-1
Math.round(-1.5)=-1
Math.round(-1.7)=-2
Math.ceil()
ceil就是天花板的意思,就是对上取整,举例:
System.out.println("Math.ceil(1.2)="+Math.ceil(1.2));
System.out.println("Math.ceil(1.5)="+Math.ceil(1.5));
System.out.println("Math.ceil(1.7)="+Math.ceil(1.7));
System.out.println("Math.ceil(-1.2)="+Math.ceil(-1.2));
System.out.println("Math.ceil(-1.5)="+Math.ceil(-1.5));
System.out.println("Math.ceil(-1.7)="+Math.ceil(-1.7));
结果输出为:
Math.ceil(1.2)=2.0
Math.ceil(1.5)=2.0
Math.ceil(1.7)=2.0
Math.ceil(-1.2)=-1.0
Math.ceil(-1.5)=-1.0
Math.ceil(-1.7)=-1.0
Math.floor()
floor就是地板的意思,就是对下取整,举例:
System.out.println("Math.floor(1.2)="+Math.floor(1.2));
System.out.println("Math.floor(1.5)="+Math.floor(1.5));
System.out.println("Math.floor(1.7)="+Math.floor(1.7));
System.out.println("Math.floor(-1.2)="+Math.floor(-1.2));
System.out.println("Math.floor(-1.5)="+Math.floor(-1.5));
System.out.println("Math.floor(-1.7)="+Math.floor(-1.7));
结果输出为:
Math.floor(1.2)=1.0
Math.floor(1.5)=1.0
Math.floor(1.7)=1.0
Math.floor(-1.2)=-2.0
Math.floor(-1.5)=-2.0
Math.floor(-1.7)=-2.0
Math.abs()
就是取绝对值,举例:
System.out.println("Math.abs(1.2)="+Math.abs(1.2));
System.out.println("Math.abs(1.5)="+Math.abs(1.5));
System.out.println("Math.abs(1.7)="+Math.abs(1.7));
System.out.println("Math.abs(-1.2)="+Math.abs(-1.2));
System.out.println("Math.abs(-1.5)="+Math.abs(-1.5));
System.out.println("Math.abs(-1.7)="+Math.abs(-1.7));
结果输出为:
Math.abs(1.2)=1.2
Math.abs(1.5)=1.5
Math.abs(1.7)=1.7
Math.abs(-1.2)=1.2
Math.abs(-1.5)=1.5
Math.abs(-1.7)=1.7
来源:CSDN
作者:张明flying
链接:https://blog.csdn.net/qq_41135254/article/details/104876917