Help with C# -- Rounding

cintirich · January 17th, 2012, 01:37 PM

Hi all,

I'm taking a course in C# and I can't figure out how to get my values (in red) to round to 2 digits. I've searched the internet and I know that Math.round() is the way to do it, in theory, but I can't figure out how to actually implement it into my program, i.e., where to put it and in what format.

If anyone can help, I'd certainly appreciate it!

Thanks,
Rich

namespace ConsoleApplication1
{
class Program
{

static void Main(string[] args)
{
double pv, interestrate, bal, pp, pmt, mir, interestpaid;
int term;

Console.WriteLine("Enter your interest rate in % form ");
interestrate = double.Parse(Console.ReadLine());

Console.WriteLine("Enter your term, in months ");
term = int.Parse(Console.ReadLine());

Console.WriteLine("Enter the amount borrowed ");
pv = double.Parse(Console.ReadLine());

mir = interestrate / 1200;
interestpaid = mir * pv;
pmt = pv * (interestrate / (1 - (1 / ((Math.Pow((1 + mir), term))))));
bal = pv - pmt;
pp = pmt - interestpaid;

Console.WriteLine("Payment Amount Interest Paid Principle Paid New Balance ");
Console.WriteLine(pmt + " " + interestpaid + " " + interestpaid + " " + bal);
}
}
}

IceThatJaw · January 17th, 2012, 02:51 PM

This forum is specifically for the book but this link tells you how to do it.

http://msdn.microsoft.com/en-us/library/3s2d3xkk.aspx

It looks pretty simple to round to nearest.

Code:

Math.Round(4.4); // rounds to 4

Math.Round(4.5); // rounds to 4

Math.Round(4.6); // rounds to 5

Just replacing those hardcoded numbers with whatever variable you want to round should do the trick. I haven't tried this but you should be able to use it inline as well.

Code:

Console.WriteLine(Math.Round(pmt) + " " + Math.Round(interestpaid) 
+ " " + Math.Round(interestpaid ) + " " + Math.Round(bal));

Also, are you supposed to be adding in the interest twice? It looks like you might want to replace the second interestpaid variable with pp instead. At least that what it looks like from your heading.