Random Numbers & AgeCalculation

Hmm.....Thanks...

Reading, & Keep on Reading..........

Keep reading and, above all, writing your own code.

I've been programming .NET since it started more than 6 years ago, but I'm still learning and there are some exciting developments on the horizon to look forward to :)

Yeah,I think this is the one i understood very easily.And I understood the rational number program,because i had done GCD already.Ur code is easy.Thanks.

But the previous one(Age) is,difficult to understand for me.I hope its because of lack of my Programming skill.Am finding a way to improve my skill.Any Guidence from u to improve skill?

Thanks Again.

Here's another way of calculating someone's age that you might find easier to understand:

string dob = "01/01/1980"; // or whatever
DateTime dt1 = DateTime.Parse(dob);
DateTime dt2 = DateTime.Now; 
int age = dt2.Year - dt1.Year;
if (dt2.Month < dt1.Month ||(dt2.Month == dt1.Month && dt2.Day < dt1.Day)) age-- ;

Because the months having a varying number of days and you've also got the leap year problem, the idea behind this algorithm is to find an easy and consistent way of converting a given date into a number.

To do this, you assume that every month has 31 days and hence every year has 12 * 31 = 372 days. It doesn't matter that this is fictitious when all you're doing is working out the number of complete years between two dates and in certain other applications :)

int d1 = dt1.Year * 372 + (dt1.Month - 1) * 31 + dt1.Day - 1;
int d2 = dt2.Year * 372 + (dt2.Month - 1) * 31 + dt2.Day - 1;
int age = (d2 - d1) / 372;

Can u please tell me how do u multiply year by 372 ? Is there any specific reason?

Thanks a lot 4 ur both answers.

I need some time to analyze it.

If it helps you with the rational number exercise, I've dug out some code I wrote a while back which contains methods to convert decimals and doubles to fractions in their lowest terms:

using System;

class Test
{
    static void Main()
    {
        string result = DecimalToFraction(0.235M, false);
        Console.WriteLine(result);
        string result2 = DoubleToFraction(0.72, false);
        Console.WriteLine(result2);
        Console.ReadKey();
    }

    public static string DecimalToFraction(decimal number, bool mixed)
    {
       string sign = "";
       if(number < 0.0M)
       {
           sign = "-";
           number = -number;
       } 
       long numerator = (long)number;
       long denominator = 1;
       while (numerator != number)
       {
           number *= 10.0M;
           denominator *= 10L;
           numerator = (long)number;
       }
       if (denominator == 1)
          return sign + numerator.ToString();
       long gcd = GetGCD(numerator, denominator);
       numerator /= gcd;
       denominator /= gcd;
       if (!mixed)
           return sign + numerator.ToString() + "/" + denominator.ToString();
       long whole = numerator / denominator;
       numerator %= denominator;
       string sign2 = (sign == "-") ? " - " : " + ";
       return sign + whole.ToString() + sign2 + numerator.ToString() + "/" + denominator.ToString();  
    }

    public static string DecimalToFraction(decimal number)
    {
       return DecimalToFraction(number, true);   
    }

    public static string DoubleToFraction(double number, bool mixed)
    {
       if (number > (double)Decimal.MaxValue || number < (double)Decimal.MinValue)
          return "Out of range";
       return DecimalToFraction((decimal)number, mixed);   
    }

    public static string DoubleToFraction(double number)
    {
       return DoubleToFraction(number, true);   
    }

    public static long GetGCD(long numerator, long denominator)
    {
      long gcd = 0L;
      while (numerator != 0L)
      {
         gcd = numerator;
         numerator = denominator % numerator;
         denominator = gcd;
      }
      return gcd;
    }
}

To my knowledge, there is no specific class for dealing with rational numbers in .NET.

There are various ways of calculating a person's age but here's a method which I've always liked:

string dob = "01/01/1980"; // or whatever
DateTime dt1 = DateTime.Parse(dob);
DateTime dt2 = DateTime.Now;
int d1 = dt1.Year * 372 + (dt1.Month - 1) * 31 + dt1.Day - 1;
int d2 = dt2.Year * 372 + (dt2.Month - 1) * 31 + dt2.Day - 1;
int age = (d2 - d1) / 372;

If a person born on 29 February is considered, where you live, to celebrate their birthday on 28 February in a non-leap year, rather than 1 March, then change the code to this:

string dob = "01/01/1980"; // or whatever
DateTime dt1 = DateTime.Parse(dob);
DateTime dt2 = DateTime.Now;
int d1 = dt1.Year * 372 + (dt1.Month - 1) * 31 + dt1.Day - 1;
int d2 = dt2.Year * 372 + (dt2.Month - 1) * 31 + dt2.Day - 1;
if (dt1.Month == 2 && dt1.Day == 29 && dt2.Month == 2 && dt2.Day == 28 && !DateTime.IsLeapYear(dt2.Year))
   d2++;
int age = (d2 - d1) / 372;