Thread: how to give inputs to my simple java program

Hi all,

This is pokuri am in starting stage of java . Now what the error is i written a simple addition code compilation is successful . In run am getting exception "Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at AddNum.main(AddNum.java:17)"

And my code is

import java.lang.*;
 
class AddNum
{
    public static void main(String arg[])
    {
        int a;
        int b;
        int c;
 
        a=Integer.parseInt(arg[1]);
        b=Integer.parseInt(arg[2]);
        c=Integer.parseInt(arg[3]);
        c=a+b;
        System.out.println("total amount"+c);
    }
}

please give me solution for that exception and also how to give inputs to both the variables .

Java array indices start at 0, not 1. Perhaps that's your problem?

Also, in the future please surround your code with highlight tags, I've modified your post this time to reflect that.

Are you sure you're passing the correct number of parameters to your program? The syntax for calling should be something like this:

java AddNum 1 2 3

edit: removed .class

oops, my bad. I've changed my post to remove the .class

I hope you have changed your code from,

a=Integer.parseInt(arg[1]);
b=Integer.parseInt(arg[2]);
c=Integer.parseInt(arg[3]);

to

a=Integer.parseInt(arg[0]);
b=Integer.parseInt(arg[1]);
c=Integer.parseInt(arg[2]);

This is because the arguments array is 0 index based. Now when you run the code with java AddNum 1 2 3

arg[0] = 1 
arg[1] = 2
arg[2] = 3

You can use any variable other than c for you addition, so that you can use c later if needed. Because you are overriding value of c as soon as its received from arguments, which doesn't make much sense. After this I don't think there should be any problem.

Hope that helps,

Goldest