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From: Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups: comp.lang.java.help
Subject: Re: Compile error: java: <identifier> expected
Date: Sat, 23 Jun 2018 08:05:57 -0400
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Xref: csiph.com comp.lang.java.help:4223

On 6/22/2018 3:54 AM, fernandofernando998877@gmail.com wrote:
> hello i immediately need help!!!
> i am trying to learn overloading and i am in 10 standard so please help me
> i am getting identifier expected error
> 
> import jav.io.*;

     "jav"?

> public class Overload
> {
>       double r,side,l,b,AreaSquare,AreaCircle,AreaRectangle;
>       public void area(side)//this the line where error occurs

     You must tell Java what type `side' is: a `double', an `int',
or whatever.  Thus, for example,

	public void area(double side)  // if `side' is a `double'

>       {
>           side1=side;

     Similarly, you must specify the type of `side1'.  Java cannot
just guess whether it should be a `double' or `float' or `long',
you must write what you intend.  (You've made the same omission
several more times; I won't point them all out but will trust you
to fix them yourself.)

>           AreaSquare=side1*side1;
>           System.out.println("AREA OF SQUARE="+Areasquare);
>       }
>       public void area(l,b)
>       {
>           l1=l;
>           b1=b;
>           AreaRectangle=l1*b1;
>           System.out.println("AREA OF RECTENGLE="+AreaRectangle);
>        }
>        public void area(r)

     I anticipate trouble with this overload, because if you decide
to make `r' a `double' and you have also made `side' a `double'
above, then Java will have no way to distinguish the two methods:
They will have identical parameter lists.  (The names of parameters
don't disambiguate, only their number and types matter.)

>        {
>            r1=r;
>            PI=3.14;

     FYI, the predefined constant `Math.PI' is considerably more
accurate.

>            AreaCircle=PI*r1*r1;
>            System.out.println("AREA OF CIRCLE="+AreaCircle);
>         }
>         public static void main()throws IOException
>         {
>             BufferedReader in=new BufferedReader (new InputStreamReader(System.in));
>             Overload obj=new Overload();
>             System.out.println("ENTER THE SIDE OF SQUARE=");
>             side1=Double.parseDouble(in.readLine());
>             System.out.println("ENTER THE LENGTH OF RECTANGLE=");
>             l1=Double.parseDouble(in.readLine());
>             System.out.println("ENTER THE BREADTH OF RECTANGLE=");
>             b1=Double.parseDouble(in.readLine());
>             System.out.println("ENTER THE RADIUS OF CIRCLE=");
>             r1=Double.parseDouble(in.readLine());
>             obj.area(side);
>             obj.area(l,b);
>             obj.area(r);
>          }
>      }
> 


-- 
esosman@comcast-dot-net.invalid
Nine hundred forty-two days to go.