recursive calculation of funds in a bank account

public static double calculateFinalCapital(double initialCapital, int years, double interestRate, double yearlyRate) {
    double finalCapital;
    if(years < 0)
    {   
        return initialCapital;
    }
    else
    return calculateFinalCapital(initialCapital, years-1 ,interestRate ,yearlyRate)*(interestRate+1);
}

Hey everyone, I'm having trouble getting the correct balance to show up :/

 initialCapital is the starting capital
 years is the runtime (in years)
 interestRate is the rate of interest
 yearlyRate is the yearly rate
javascriptjavarecursion

Answer №1

It appears that the issue lies in the base condition you have set. Instead of running the recursion back to year -1, it should be set to run back to year 0. Perhaps consider using:

if (n <= 0)

...

Test your code with a time period of 0: the result should return the original principal amount.

Answer №2

public static double calculateCapitalAfterYears(double initialCapital, int years, double interestRate, double yearlyAdditions) {

    //double newCapital;
    if(years <= 0)
    {   
        return initialCapital;
    }
    else
    return calculateCapitalAfterYears(initialCapital, years - 1, interestRate, yearlyAdditions)* (interestRate + 1) + yearlyAdditions;
}

Alright, after a closer look, it turns out I needed to include the + yearlyAdditions in the calculation.

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