How do I check condition in the below code?

Question

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import java.util.Scanner;

public class Parent {

	public static void main(String[] args) 
	{
		Scanner scan=new Scanner(System.in);
		
		System.out.println("enter the 1st no");
		int p=scan.nextInt();
		
		System.out.println("enter the 2nd no");
		int q=scan.nextInt();
		
		System.out.println("enter the 3rd no");
		int r=scan.nextInt();
		
		System.out.println("enter the 4th no");
		int s=scan.nextInt();
		
		Sub obj=new Sub();
		Sub obj1=new Sub(p,q);
		Sub obj2=new Sub(p,q,r);
		Sub obj3=new Sub(p,q,r,s);
		
		obj.get();
		obj1.get();
		obj2.get();		
		obj3.get();
		
		
		
	 }

}




<pre>import java.util.Scanner;

public class Sub 
{
	int w=1,x=1,y=1,z=1;
	public Sub()
	{
		x=5;
		y=4;
	}
	public Sub(int a,int b)
	{
		x=a;
		y=b;
	}
	public Sub(int a,int b,int c)
	{
		x=a;
		y=b;
		w=c;
	}
	public Sub(int a,int b,int c,int d)
	{
		x=a;
		y=b;
		w=c;
		z=d;
		
	}
	public void get()
	{
		Scanner scan=new Scanner(System.in);
		System.out.println("choose the no. of operation you want to do");
		System.out.println("  1 --> +  \n  2--> - \n  3--> * \n  4--> /");
		int k=scan.nextInt();
		
		switch(k)
		
		{
		case 1: 
			
			double c22 = w+x+y+z;
			
			int i=(w==1&&x==5&&y==4&&z==1)?System.out.println("result for 1st"):
         //ERROR : a,b,c are not defined.
			(w==1&&x==a&&y==b&&z==1)?System.out.println("result for 2nd"):
			(w==c&&x==a&&y==b&&z==1)?System.out.println("result for 3nd"):
					System.out.println("result for 4th");	
			
			 	System.out.println(i);
			
			System.out.println("addition of two no. is :  " +c22);
			break;
		
		case 2: 
			
			double c1 = w-x-y-z;

			int j=(w==1&&x==5&&y==4&&z==1)?System.out.println("result for 1st"):
	//ERROR : a,b,c are not defined.
			(w==1&&x==a&&y==b&&z==1)?System.out.println("result for 2nd"):
				(w==c&&x==a&&y==b&&z==1)?System.out.println("result for 3nd"):
					System.out.println("result for 4th");	
				
				System.out.println(j);
				
			System.out.println("subtration of two no. is :  " +c1);
			break;
	
		case 3: 
			
			double c11 = w*x*y*z;
			
			int h=(w==1&&x==5&&y==4&&z==1)?System.out.println("result for 1st"):
	//ERROR : a,b,c are not defined.
		(w==1&&x==a&&y==b&&z==1)?System.out.println("result for 2nd"):
				(w==c&&x==a&&y==b&&z==1)?System.out.println("result for 3nd"):
					System.out.println("result for 4th");	

				System.out.println(h);
				
			System.out.println("multiplication of two no. is :  " +c11);
			break;
		
		case 4: 
			
			double f = w/x/y/z;
			
			int g=(w==1&&x==5&&y==4&&z==1)?System.out.println("result for 1st"):
           //ERROR : a,b,c are not defined.
				(w==1&&x==a&&y==b&&z==1)?System.out.println("result for 2nd"):
				(w==c&&x==a&&y==b&&z==1)?System.out.println("result for 3nd"):
					System.out.println("result for 4th");	
				
				System.out.println(g);
				
			System.out.println("division of two no. is :  " +f);
			break;
			
        default :
        	System.out.println("you choose wrong option.\n     "
        			+ "     please i request you to choose one of the option listed above  !!");
	//IMPORTANT	  
        	get();
        	break;
		}
	}
}

What I have tried:

in the above code i want to check whether the input are matched with which constructor for which i have use switch method and ternary condition but in ternary condition when i check whether "w==a" etc it does not check it..

how can i check such condition?

Posted 22-Jun-17 10:36am

Member 13274362

Updated 22-Jun-17 23:41pm

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Comments

wseng 22-Jun-17 23:50pm

what should i,j,h,g print ?

Member 13274362 23-Jun-17 3:24am

The print statement i.e., result for 1st || result for 2nd || result for 3rd || result for 4th !

wseng 23-Jun-17 3:41am

Datatype with int can only print number.

Member 13274362 23-Jun-17 4:00am

I've change it to String but that's not the problem..
Error is when i check (w,x,y,z) contains (c,a,b,d) it does not check it which i have mention in comment.

Query is how can i resolve this error ?

wseng 23-Jun-17 5:47am

But why you assigned 1 to w,x,y,z?

Member 13274362 23-Jun-17 10:21am

let me explain wait...

see i have initialize x,y,w,z with 1;
and

i have make 4 constructor with different parameters..
1st -> default ! ; in which default values will assign i.e., w=1,x=5,y=4,z=1 .
2nd -> 2 parameters i.e., p & q which are user input which will assign to a & b and then assign to x and y.
3rd -> 3 parameters i.e., similar as 2 parametric constructor will assign p,q & r to a,b & c and then x,y & w respectively.
4th -> 4 parameters i.e., similar as above i.e., p,q,r,s to a,b,c,d and then to x,y,w,z respectively.

right ?

then in get method ...
in switch i have make a basic calculator i.e., addition, subtraction , multiplication and division
then i want to print a statement i.e., ("result for 1st || result for 2nd || result for 3rd || result for 4th ") for which i have use ternary operator where i want to check if :
--default constructor is called then print ("result for 1st")
--2 parametric constructor is called the print ("result for 2nd")
--3 parametric constructor is called then print ("result for 3rd")
--4 parametric constructor is called the print ("result for 4th")

but when i check this condition it does not resolve a,b,c,d in each case ....which are used in constructor which store user input and assign to x,y,w,z respectively..!

this is the problem ....

tell me how can i check this ???

wseng 24-Jun-17 9:04am

Have you checked my answer ?

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wseng · Answer 1 · 2017-06-22T23:41:00

1. ERROR : a,b,c are not defined

You should set int a,b,c in global

2.Assign value of the parameter a,b,c,d to variable a,b,c,d which you have set in the global

public Sub(int a, int b, int c, int d) {
      this.a=a;
      this.b=b;
      this.c=c;
      this.d=d;
   }

3. Modify your ocde as below. int cannot print String result

switch (k)
       {
           case 1:
               double c22 = w + x + y + z;
               if (w == 1 && x == 5 && y == 4 && z == 1) {
                   System.out.println("result for 1st");
               }
               else if(w == 1 && x == a && y == b && z == 1)
              {
               System.out.println("result for 2nd");
               }
               else if(w == c && x == a && y == b && z == 1)
               {
               System.out.println("result for 3nd");
               System.out.println("result for 4th");
               }
               else
               {
               System.out.println("no matched");
               }
           System.out.println("addition of two no. is :  " + c22);
           break;
           .....
        }