四则运算小程序

package j;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
            Scanner in=new Scanner (System.in);
            System.out.println("题目的数量");
                
            int number=in.nextInt();
            System.out.println("数值范围   10 空格 200 ");//先考虑整数的
            int up,down;
            down=in.nextInt();
            up=in.nextInt();
            
            System.out.println("打印时每行的间隔");
            int between;
            between=in.nextInt();            
            System.out.println("是否有乘除法Y/N");
            
            String jud1,jud2,jud3;    
            jud1=in.next();
            System.out.println("是否支持小数Y/N");
            jud2=in.next();            
            System.out.println("加减有无负数Y/N");    
            jud3=in.next();
            
            /*char jud4;
            System.out.println("是否有括号Y/N");
            jud4=in.nextLine().charAt(0);
            System.out.println(number+""+down+"-"+up+""+between+""+jud1+""+jud2+""+jud3+""+jud4);
            */
            do{
                int flag;    
                int shuzi;
                int b;
                int c=(int)Math.random()*4+1;
                float shuzi2;
                int signal=0;
                String Temp=new String("Y");
                
                
                if(c<2)flag=2;
                else if (c==3)flag=3;
                else flag=4;
                
                if(jud2.equalsIgnoreCase(Temp))//是否有小数点
                {
                    if(jud3.equalsIgnoreCase(Temp))//是否有负数
                        signal=(int) (Math.random()*2);
                                        
                    shuzi2=(float)(Math.random()*(up-down))+down;
                    shuzi2=(int)(shuzi2*1000);
                    shuzi2=shuzi2/1000;
                    if(signal<1)
                        System.out.print(shuzi2);
                    else
                        System.out.print("(-"+shuzi2+")");
                }                
                else{
                    if(jud3.equalsIgnoreCase(Temp))
                        signal=(int) (Math.random()*2);
                    
                 shuzi=(int)(Math.random()*(up-down)+down);
                 if(signal<1)
                        System.out.print(shuzi);
                    else
                        System.out.print("(-"+shuzi+")");    
                    
                }
                    //以上是第一个数
                    
                do{
                    if(jud1.equalsIgnoreCase(Temp))//是否有乘除
                    b=(int)(Math.random()*4+1);
                    else
                        b=(int)(Math.random()*2+1);
                    
                switch(b){    
                case 1://加
                    
                    if(jud2.equalsIgnoreCase(Temp))//是否小数点
                    {
                        shuzi2=(float)(Math.random()*(up-down))+down;
                        shuzi2=(int)(shuzi2*1000);
                        shuzi2=shuzi2/1000;
                        System.out.print("+"+shuzi2);    
                    }
                    else{
                     shuzi=(int)(Math.random()*(up-down)+down);
                     System.out.print("+"+shuzi);        
                    }
                        
                    break;
                case 2://减
                    if(jud2.equalsIgnoreCase(Temp))
                    {
                        shuzi2=(float)(Math.random()*(up-down))+down;
                        shuzi2=(int)(shuzi2*1000);
                        shuzi2=shuzi2/1000;
                        System.out.print("-"+shuzi2);    
                    }
                    else{
                     shuzi=(int)(Math.random()*(up-down)+down);
                     System.out.print("-"+shuzi);        
                    }
                    break;
                case 3://乘
                    if(jud2.equalsIgnoreCase(Temp))
                    {
                        shuzi2=(float)(Math.random()*(up-down))+down;
                        shuzi2=(int)(shuzi2*1000);
                        shuzi2=shuzi2/1000;
                        System.out.print("*"+shuzi2);    
                    }
                    else{
                     shuzi=(int)(Math.random()*(up-down)+down);
                     System.out.print("*"+shuzi);        
                    }
                    break;
                case 4://除
                    if(jud2.equalsIgnoreCase(Temp))
                    {
                        shuzi2=(float)(Math.random()*(up-down))+down;
                        shuzi2=(int)(shuzi2*1000);
                        shuzi2=shuzi2/1000;
                        System.out.print("/"+shuzi2);    
                    }
                    else{
                     shuzi=(int)(Math.random()*(up-down)+down);
                     System.out.print("/"+shuzi);        
                    }
                    break;    
                }
                flag--;
                }while(flag>0);
                    System.out.print("=");
                number--;
                for(int k=1;k<=between;k++)
                System.out.println();
                }while(number>0);
        
            
            }
            }