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Question

    public static double sumGeom(double term, double ratio, int n)
    {
        double sum = 0;

        if (n<=1)
        {
            return term;
        }
        else
        {
            sum = sum + term * ratio;
            return sumGeom(term * ratio, ratio, n-1);
        }
    }
}

//Geometric sequence: 2 4 8 16 32
//Geometric sum: 62

I am a beginner to Java, and my assignment was to find the sum of a geometric sequence using recursion only.

The parameters are: term = 2, ratio = 2 and n = 5. Above is the code that I attempted. I am having a very hard time visualize how recursions work, so I do not know what went wrong with my code. Instead of giving me the desired answer of 62, I am getting 32 instead. What is wrong with this code?

I have tried this version as well but am still getting 32 instead of 62:

public static double sumGeom(double term, double ratio, int n)
{
    double sum = 0;

    if (n<=1)
    {
        return term;
    }
    else
    {
        return sum = sum + sumGeom(term * ratio, ratio, n-1);
    }
}
}

Solution

Yes.

Ctrl⇧+F on Windows/Linux or ⌘⇧+F on a Mac.

or just go to the menu "Find" and use the option almost at the bottom called "Find in Files".

To search in all open files, add this to the Where textbox:

<open files>

If you want to search in folders and such, please just look at the right of the textbox and see there's a button .... Click on it and it will show you options.

Comments

[Jean-François Savard]

What parameters are you passing to the method?

[Thomas Weller]

Do you know what a debugger is? Run your code under the debugger and go through it step by step. You'll learn a lot.

[Tom]

Wouldn't it be clever to actually do something with sum? Like using it to calculate the return value?

[Kacper Wiszczuk]

This is because you are ignoring 'sum' variable in recursion calls, and you end up with returning only last item from geometric sequence. You should rather return sum + sumGeom(...).

[Jen123]

I returned sum + sumGeom(...) but it still doesn't work

[Tom]

Now come on, please think before trying random stuff. Your sum will always be 0.0, what do you expect here?

[lucas]

Mamsaac's answer is also supported in Sublime Text 3, for those who are wondering.

[jan deeg]

When I try this (Sublime Text 3.1.1 on Mac OS), it doesn't search all open tabs; it only searches open tabs within the current window.

[AlexLaforge]

You can also leave the "WHERE" text box Empty instead of typing <open files>.