C#•12mo ago

Help with adding something up

Need to add up the total amount PAID, im not sure how though

33 Replies

AubreyOP•12mo ago

namespace KreditRechner
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double interest, loan, monthly, durationY, durationM, interestrate,
                   month=1;

            interestrate= Convert.ToDouble(textBoxInterest.Text);
            loan        = Convert.ToDouble(textBoxloan.Text);
            monthly     = Convert.ToDouble(textBoxMonthly.Text);

            listBox1.Items.Clear();
            listBox1.Items.Add(month + ". Month : " + loan + "€");
            
            
            while (loan > monthly) 
            {
              
                interest = loan * (interestrate / 100 / 12);
                loan = loan - monthly + interest;
               
                

                month++;
                listBox1.Items.Add(month + ". Month : " + Math.Round(loan, 2) + "€");

            }

            listBox1.Items.Add(month + ". Month : " + 0 + "€");

            durationY = month % 12;
            durationM = month / 12;

            listBoxDuration.Items.Clear();
            listBoxDuration.Items.Add(durationY + " years and ");
            listBoxDuration.Items.Add(Math.Round(durationM, 0) + " months");

            
            listBoxTotal.Items.Clear();
            listboxTotal.Items.Add();
            

            
        }
    }
}

namespace KreditRechner
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double interest, loan, monthly, durationY, durationM, interestrate,
                   month=1;

            interestrate= Convert.ToDouble(textBoxInterest.Text);
            loan        = Convert.ToDouble(textBoxloan.Text);
            monthly     = Convert.ToDouble(textBoxMonthly.Text);

            listBox1.Items.Clear();
            listBox1.Items.Add(month + ". Month : " + loan + "€");
            
            
            while (loan > monthly) 
            {
              
                interest = loan * (interestrate / 100 / 12);
                loan = loan - monthly + interest;
               
                

                month++;
                listBox1.Items.Add(month + ". Month : " + Math.Round(loan, 2) + "€");

            }

            listBox1.Items.Add(month + ". Month : " + 0 + "€");

            durationY = month % 12;
            durationM = month / 12;

            listBoxDuration.Items.Clear();
            listBoxDuration.Items.Add(durationY + " years and ");
            listBoxDuration.Items.Add(Math.Round(durationM, 0) + " months");

            
            listBoxTotal.Items.Clear();
            listboxTotal.Items.Add();
            

            
        }
    }
}

SinFluxx•12mo ago

Well you already have a while loop that keeps running until you reach 0, so in that loop you should keep summing up the monthly payment and interest accrued each month at the same time to a total variable You even know what the total loan amount is so you could start it at that and then just add the interest each loop

AubreyOP•12mo ago

thats the part that confuses me im not sure how to do it

SinFluxx•12mo ago

Think about what you're doing with your loan variable inside the while loop, and how it's really not all that different

AubreyOP•12mo ago

why does it do this when its outside the while loop

SinFluxx•12mo ago

Did you declare your total variable inside the while loop?

AubreyOP•12mo ago

yes

SinFluxx•12mo ago

That's why then

AubreyOP•12mo ago

its what im supposed to do, no?

SinFluxx•12mo ago

No, if you declare it inside the loop a) it's restricted to that scope, and b) it will reset to 0 on each iteration of the loop so won't actually get your total You should declare it before the loop, same as you did with loan

AubreyOP•12mo ago

so this will work?

SinFluxx•12mo ago

Give it a go

AubreyOP•12mo ago

definitely removed the error still confused on the total though

SinFluxx•12mo ago

Why?

AubreyOP•12mo ago

dont know how to get it 😭

SinFluxx•12mo ago

What do you mean "get it"?

AubreyOP•12mo ago

the total amount

SinFluxx•12mo ago

That's not what I asked

AubreyOP•12mo ago

well how to calculate it i always get some low number, which doesnt quite make sense

SinFluxx•12mo ago

What's the code you've added for it?

AubreyOP•12mo ago

ive tried

total = loan + interest

total = loan + interest

inside the loop but that didnt work

SinFluxx•12mo ago

Well, that should give you a big number, too big a number, because you're adding the remaining loan amount every time

AubreyOP•12mo ago

it gave me a number below 10000 like 600 something

SinFluxx•12mo ago

Yes sorry I just reread it, so there are two issues, you're adding the loan amount and you're not taking into account the existing total value For example when you're calculating the loan amount you start with loan = loan... Working out this specific line isn't particularly a programming problem, think about how you would do it if you were keeping track of the total you paid each month in a notebook or something

AubreyOP•12mo ago

total = total + loan would give me a huge number

SinFluxx•12mo ago

I already said adding loan was wrong? Why would you add loan each time?

AubreyOP•12mo ago

im slow

SinFluxx•12mo ago

If you wanted to include the loan then you would start the total amount at the loan amount once, before the while loop, then just add the interest each time in the loop OR You would start total at 0 and add the monthly amount and interest amount inside the loop

AubreyOP•12mo ago

OH MY GOD THANK YOU THANK YOU SO MUCH IT WORKS

SinFluxx•12mo ago

You're welcome blobthumbsup

honestly though you had done a lot of similar things already, so in theory you could have figured it out (though don't be afraid to ask for help), so perhaps just try and break things down into smaller chunks/write things down etc to help you figure them out

AubreyOP•12mo ago

my brain isnt functioning well today at all

SinFluxx•12mo ago

And sometimes just take a break! Having a break then coming back to it can help

AubreyOP•12mo ago

its because of the math exam i had today my math since then has been questionable

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Help with adding something up