四则运算程序扩展：将程序改为java语言,并允许用户输入，对输入结果进行验证

package minirisoft;

import java.util.Random;
import java.util.Scanner;

public class SizeYunsuan {
	public static Random rand=new Random();
	public static class Qst
	{
		static int Operand(int Range)//产生操作数
		{
			int Opd=rand.nextInt(Range*2+1)-Range;
			return Opd;
		}
		public static char OperatorKind(char Operator,boolean IfSuppMD)//生成运算符
		{
			int OperatorPossible=rand.nextInt(4);
			if(!IfSuppMD)
			{
				OperatorPossible/=2;
			}
			switch(OperatorPossible)
            {
	            case 0:
	            	Operator=‘+‘;
	                break;
	            case 1:
	            	Operator=‘-‘;
	                break;
	            case 2:
	            	Operator=‘*‘;
	                break;
	            case 3:
	            	Operator=‘/‘;
	                break;
	            default:
	            	System.out.print("Error!");
            }
			return Operator;
		}
		public static boolean IfRepeated(String str[],int Location)//判断是否重复
		{
			for(int i=0;i<Location;i++)
			{
				if(str[i].equals(str[Location]))
					return true;
			}
			return false;
		}
		public static int Ans(int ans,int Operand1,int Operand2,char Operator)//生成答案
		{
			switch(Operator)
            {
	            case ‘+‘:
	            	ans=Operand1+Operand2;
	                break;
	            case ‘-‘:
	            	ans=Operand1-Operand2;
	                break;
	            case ‘*‘:
	            	ans=Operand1*Operand2;
	                break;
	            case ‘/‘:
	            		ans=Operand1/Operand2;
	                break;
	            default:
	            	System.out.print("Error!");
            }
			return ans;
		}
		//生成一道运算题
		public static void CreateStr(int Range,char Operator,String str[],int i,int QstNum,int ans[],boolean IfSuppMD)
		{	    int answer = 0;
				Qst.OperatorKind(Operator,IfSuppMD);
				int Operand1=Qst.Operand(Range);
				int Operand2=Qst.Operand(Range);
				str[i]=Integer.toString(Operand1);
				str[i]+=Operator;
				str[i]+=Integer.toString(Operand2);
				str[i]+="=";
				while(IfRepeated(str,i))//判断是否重复
				{
					Operand1=Qst.Operand(Range);
					Operand2=Qst.Operand(Range);
					str[i]=Integer.toString(Operand1);
					str[i]+=Operator;
					str[i]+=Integer.toString(Operand2);
					str[i]+="=";
				}
					ans[i]=Qst.Ans(answer,Operand1,Operand2,Operator);
		}
		public static void Display(String str[],int Col)//输出生成的运算题
		{
			
			for(int j=0;j<str.length;j++)
			{
				System.out.print(str[j]);
				if(j%Col==Col-1)
				{
					System.out.println();
				}
				else
				{
					System.out.print(‘\t‘);
				}
			}
		}
		public static void Input(int Input[],int QstNum)//输入问题答案
		{
			Scanner sca=new Scanner(System.in);
			for(int j=0;j<QstNum;j++)
			{
				Input[j]=sca.nextInt();
			}
		}
		public static void OutAns(int ans[],int QstNum,int Col)//输出答案
		{
			for(int j=0;j<QstNum;j++)
			{
				System.out.print(ans[j]);
				if(j%Col==Col-1)
				{
					System.out.println();
				}
				else
				{
					System.out.print(‘\t‘);
				}
			}
		}
		public static void ConfirmAns(int ans[],int Input[],int QstNum,int count)
		{
			count=0;
			for(int i=0;i<QstNum;i++)
			{
				if(ans[i]==Input[i])
					count++;
			}
			System.out.println("答题正确个数：");
			System.out.print(count);
		}
		
	}
	
	public static void main(String args[])
	{
		int Range,QstNum=0,Col=0,count=0;
		boolean IfSuppMD=true;
		char Operator = ‘+‘;
		Scanner sca=new Scanner(System.in);
		System.out.println("请输入生成题目的数量:");
		QstNum=sca.nextInt();
		System.out.println("请输入算数范围:");
		Range=sca.nextInt();
		System.out.println("请输入划分列数:");
		Col=sca.nextInt();
		System.out.println("是否支持乘除法:(true/false)");
		IfSuppMD=sca.nextBoolean();
		String str[] = new String[QstNum];
		int ans[]=new int[QstNum];
		int Input[]=new int[QstNum];
		for( int i=0;i<QstNum;i++)
		{
			try
			{
				Qst.CreateStr(Range,Qst.OperatorKind(Operator,IfSuppMD),str,i,QstNum,ans,IfSuppMD);
			}
			catch(Exception e)
			{
				i--;
			};
		}
		Qst.Display(str,Col);
		Qst.Input(Input, QstNum);
		System.out.println("输入答案：");
		System.out.println();
		Qst.OutAns(Input,QstNum,Col);
		System.out.println("正确答案：");
		System.out.println();
		Qst.OutAns(ans,QstNum,Col);
		Qst.ConfirmAns(ans,Input,QstNum,count);
	}


}