Random Numbers & AgeCalculation

Question

H ello I found one exercise with Ratioal Numbers and the result will be in rational number too.Can anyone of u Please help me. 1)Do we have any Specific Data type for represent Rational Numbers in C#? 2)How will i calculate Age of the Person?(Any Clues) I have searched in the Net.But I didnt find an Answer for it. Ur Reply is Valuable to me. Thanks.

jaguRita · Answer

Hmm.....Thanks... Reading & Keep on Reading..........

Alan · Answer

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 :)

jaguRita · Answer

YeahI think this is the one i understood very easily.And I understood the rational number programbecause i had done GCD already.Ur code is easy.Thanks. But the previous one(Age) isdifficult 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.

Alan · Answer

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

Alan · Answer

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 :)

jaguRita · Answer

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?

jaguRita · Answer

Thanks a lot 4 ur both answers. I need some time to analyze it.

Alan · Answer

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 { 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 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; } }

Alan · Answer

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;