四则运算

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

public class Suiji {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
int i; //整数1
int j; //整数2

int k; //运算符号

int q; //生成数量

int w; //整数或真分数
Scanner sca= new Scanner(System.in);
    System.out.println("请输入定制数量");
        q= sca.nextInt();

    System.out.println("1整数 / 2真分数");
        w= sca.nextInt();
        
    
for(;q>0;q--)
    {
    

        Random random = new Random();
        i= random.nextInt(100);
        j= random.nextInt(100);
        k= random.nextInt(4);


    if(w==1)    
    
        {    if(k==0) System.out.println(i+"  +  "+j+"  =  "+(i+j));
            if(k==1) System.out.println(i+"  -  "+j+"  =  "+(i-j));
            if(k==2) System.out.println(i+"  *  "+j+"  =  "+(i*j));
            if(k==3) 
            if(j!=0)
                {
                    System.out.println(i+" / "+j+" = "+(i/j));
                }
        }
        if(w==2)
        {    

            int a,b;//分子
            a= random.nextInt(i);
            b= random.nextInt(j);
            
            if(k==0) System.out.println(a+"/"+i+"  +  "+b+"/"+j+" ="+(a*j+b*i)+"/"+(i*j));
            if(k==1) System.out.println(a+"/"+i+"  -  "+b+"/"+j+" ="+(a*j-b*i)+"/"+(i*j));
            if(k==2) System.out.println(a+"/"+i+"  *  "+b+"/"+j+" ="+(a*b)+"/"+(i*j));
            if(k==3) System.out.println(a+"/"+i+"  /  "+b+"/"+j+" ="+(a*j)+"/"+(i*b));
        
        
        }
        
    }    
 }

}
在网页还不知道咋弄