【编程】分别从性能优先和维护两个角度完成printChang

import java.math.BigDecimal;

public class Test3 {

    public void printchagnge(double sum,double leave){
        double[] a={100,50,20,10,5,1,0.5,0.1,0.05,0.01};
        int[] b=new int[10];
        //避免误差 比如30-33.34，结果就是16.659999999999997，懵逼
        BigDecimal sum1=new BigDecimal(Double.toString(sum));
        BigDecimal leave1=new BigDecimal(Double.toString(leave));
        double t=sum1.subtract(leave1).doubleValue();


        for(int i=0;i<10;i++){
            int temp=(int) (t/a[i]);
            if(temp>=1){

                t=t-a[i]*temp;
            }
            b[i]=temp;

        }

        for(int i=0;i<10;i++){
            switch(i){
            case 0: if(b[i]!=0){
                System.out.print(b[i]+"个100元，");
            }
            break;

            case 1: if(b[i]!=0){
                System.out.print(b[i]+"个50元，");
            }
            break;

            case 2: if(b[i]!=0){
                System.out.print(b[i]+"个20元，");
            }
            break;

            case 3: if(b[i]!=0){
                System.out.print(b[i]+"个10元，");
            }
            break;

            case 4: if(b[i]!=0){
                System.out.print(b[i]+"个5元，");
            }
            break;

            case 5: if(b[i]!=0){
                System.out.print(b[i]+"个1元，");
            }
            break;

            case 6: if(b[i]!=0){
                System.out.print(b[i]+"个5毛，");
            }
            break;

            case 7: if(b[i]!=0){
                System.out.print(b[i]+"个1毛，");
            }
            break;

            case 8: if(b[i]!=0){
                System.out.print(b[i]+"个5分，");

            }
            break;

            case 9: if(b[i]!=0){
                System.out.print(b[i]+"个1分");
            }
            break;



            }
        }

    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Test3 t=new Test3();
        t.printchagnge(50, 33.34);

        }
    }

function getChange(){
            var count=prompt('应付金额：（/元）');
            var money=prompt('总金额为：（/元）');
            var change=(parseFloat(money)-parseFloat(count)).toFixed(1);
            console.log(change);
            if(change<100&&change>0){
                var shi=Math.floor(change/10);
                if(change%10>=5){
                    var wu=1;
                    var yi=parseInt(change%10)-5;
                }else{
                    var wu=0;
                    var yi=parseInt(change%10);
                }
                if(change%1!=change){
                    if(change%1>=0.5){
                        var wujiao=1;
                        var yijiao=parseFloat(change%1)-0.5;
                    }else{
                        var wujiao=0;
                        var yijiao=parseInt(change%1);
                    }
                }
            }
            console.log('应找：'+shi+'张10元，'+wu+'张5元，'+yi+'张1元,'+wujiao+'个5角，'+yijiao+'个1角');
        }
        getChange();