Anyone can please help me to rectify the following java code ?

Question

1.00/5 (1 vote)

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I am actually getting " <identifier> expected " error for parameters passed in methods.

What I have tried:

import java.util.Scanner;
import java.lang.Math;

 

class Quad 
{
    int a,b,c;
    float d,x1,x2;
    
    void discriminant( a, b, c)
    {
        
        d = b*b - 4*a*c;
        
        if(d<0)
        {
            System.out.println("Roots are imaginary.");
        }
        else if (d>0)
        {
            System.out.println("Roots are real and unequal. ");
            roots(a,b,c);
        }
        else
        {
            System.out.println("Roots are real and equal. ");
            roots(a,b,c);
        }    
            
        
    }
    
    void roots(a, b, c)
    {
        
        x1 = (-b - Math.sqrt(d))*0.5;
        x2 = (-b + Math.sqrt(d))*0.5;
        
        System.out.println("Roots of the equation are " + x1 + "and " + x2 + " .");
    }
}

 

public class Program3
{
    
    public static void main(String[] args) 
    {
        int a1, a2, a3;
        
        Quad obj = new Quad();
        Scanner sc = new Scanner(System.in);
        
        System.out.println("Enter the value of a :");
        a1 = sc.nextInt();
        
        System.out.println("Enter the value of b :");
        a2 = sc.nextInt();
        
        System.out.println("Enter the value of c :");
        a3 = sc.nextInt();
        
        obj.discriminant(a1,a2,a3);
        sc.close();
       
    }
}

Posted 17-Jul-21 20:20pm

Hemil Shah 2021

Updated 17-Jul-21 21:27pm

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Richard MacCutchan · Accepted Answer · 2021-07-17T21:27:00

Solution 1

You need to declare the parameter types in your function definitions:

Java

void discriminant( a, b, c) // the compiler cannot guess the types of a, b and c

// correct way
void discriminant(int a, int b, int c) // tell the compiler the types of the inputs

And the same for the roots function. Although you probably need to make all variables float type for consistency.

Posted 17-Jul-21 21:27pm

Richard MacCutchan

Comments

Hemil Shah 2021 18-Jul-21 3:41am

Thanks for the quick response !

I actually did that at first but it seemed to be didn't work again, maybe because of some other errors as well. Nonetheless it working now! Cheers