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  • java Math类

    package cn.sasa.demo3;
    
    import java.text.DecimalFormat;
    
    public class MathDemo {
        public static void main(String[] args) {
            //返回平方根
            double sqrtNum = Math.sqrt(4);
            System.out.println(sqrtNum);
            
            //向下取整
            double floorNum = Math.floor(1.8);
            System.out.println(floorNum);
            
            //向上取整
            double ceilNum = Math.ceil(1.1);
            System.out.println(ceilNum);
            
            //四舍五入
            double roundNum = Math.round(4.5);
            System.out.println(roundNum);
            
            //绝对值
            double absNum = Math.abs(-7);
            System.out.println(absNum);
            
            //a的b次方
            double powNum = Math.pow(2, 3);
            System.out.println(powNum);
            
            //保留2位小数
            double d1 = 3.141592653;
    //        DecimalFormat dformat = new DecimalFormat("#.##");
    //        double dfNum = Double.parseDouble(dformat.format(d1));
            double dfNum = Double.parseDouble(String.format("%.2f", d1));
            System.out.println(dfNum);
            
        }
    }
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  • 原文地址:https://www.cnblogs.com/SasaL/p/10130401.html
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