租车系统 新手写的不好

package dada;

import java.util.Scanner;

public class dada {
    public static void main (String[] args){
        System.out.println("欢迎使用答答租车系统");
        System.out.println("您是否要租车：1是 2否");
        Scanner inp = new Scanner(System.in);
        int num =inp.nextInt();
        switch (num){ //用switch判断，1进入程序   其他则退出
        case 1:
            System.out.println("您可租车的类型及价目表：");
            System.out.println("序号-汽车名称-租金----容量");
            int pic1 = 500;//序号1车的价钱
            int pre1 = 4;//序号1车的载人数
            System.out.println("1.--奥迪A4--"+pic1+"元/天-"+pre1+"人");
            int pic2 = 400;
            int pre2 = 4;
            System.out.println("2.--马自达6-"+pic2+"元/天-"+pre2+"人");
            int pic3 = 450;
            int pre3 = 4;
            int load3 =2;//序号3车的载重数
            System.out.println("3.--皮卡---"+pic3+"元/天--"+pre3+"人"+load3+"吨");
            int pic4 = 800;
            int pre4 = 20;
            System.out.println("4.--金龙---"+pic4+"元/天--"+pre4+"人");
            int pic5 = 400;
            int load5 = 4;
            System.out.println("5.--松花江--"+pic5+"元/天--"+load5+"吨");
            int pic6 = 1000;
            int load6 = 20;
            System.out.println("6.--依维柯--"+pic6+"元/天--"+load6+"吨");
            System.out.println("请输入您要租车的数量：");
            Scanner inpu = new Scanner(System.in);
            int num2 = inpu.nextInt();
            int sumPic=0;//租车总价
            int sunPre=0;//租车总载人数
            int sunLoad=0;//租车总载重数

            //下面循坏为选择车辆序号，并且每选择一次累加一次总价、总载人、、总载重
            for (int i = 1;i<=num2;i++){
                System.out.println("请输入第"+i+"辆车的序号：");

                int num3= inp.nextInt();

                switch(num3){
                case 1:
                    sumPic=sumPic+pic1;
                    sunPre=sunPre+pre1;
                    break;
                case 2:
                    sumPic=sumPic+pic2;
                    sunPre=sunPre+pre2;
                    break;
                case 3:
                    sumPic=sumPic+pic3;
                    sunPre=sunPre+pre3;
                    sunLoad = sunLoad+load3;
                    break;  
                case 4:
                    sumPic=sumPic+pic4;
                    sunPre=sunPre+pre4;

                    break;
                case 5:
                     sumPic=sumPic+pic5;
                    sunLoad=sunLoad+load5;
                    break;
                case 6:
                     sumPic=sumPic+pic6;
                     sunLoad=sunLoad+load6;
                    break;

                }
            }
            System.out.println("请输入租车天数：");

            int f = inp.nextInt();
            int zongjia =f*sumPic;
            System.out.println("你租车的总价格为："+zongjia+"元");
            System.out.println("你总人数为："+sunPre+"人");
            System.out.println("你总载重为："+sunLoad+"吨");
            break;
        default:
            System.out.println("谢谢使用，再见！");
            break;
        }

    }

}